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501.

The recessive genes located on X-Chromosomes in humans are alwaysA. Expressed in malesB. Expressed in femalesC. LethalD. Sub-lethal

Answer» Correct Answer - A
502.

The recessive genes located on X-chromosome in humans are alwaysA. lethalB. sublethalC. expressed in malesD. expressed in females

Answer» Correct Answer - C
The recessive genes located on X-chromosome in humans are always expressed in males because a female may be homozygous or heterozygous while male is always hemizygous (i.e. only allele is present). Haemophilia, colour blindness are some human diseases which are frequently found in males.
503.

Recessive gene present on one X- chromosome of humans will beA. LethalB. Sub-lethalC. Expressed in malesD. Expressed in females

Answer» Correct Answer - C
Recessive gene present on one X-chromosome of humans will be expressed in males.
504.

A : Myotonic dystrophy is is caused by recessive mutant pleiotropic gene. R : Gene mutation leads to more synthesis of fibrillin proteins.A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)B. If both Assertion & Reason are true and the reason is not the correct explanation of the assertion , then mark (2)C. If Assertion is true statement but Reason is false, then mark (3)D. If both Assertion and Reason are false statements, then mark (4)

Answer» Correct Answer - D
505.

Assertion : Haemophilia shows cirss-cross inheritacne. Reason : The gene that causes haemophilia is recessive and lies in the sex (X) chromosome.A. If both A and R are true and R is the correct explanation of A.B. If both A and R are true and R is not the correct explanation of A.C. If A is true but R is falseD. If both A and R are false

Answer» Correct Answer - A
506.

The recessive gene located on X-chromosome of humans are alwaysA. LethalB. Sub-lethalC. Expressed in malesD. Expressed in females

Answer» Correct Answer - C
507.

The gene for diabetes mellitus isA. Autosomal dominantB. Autosomal recessiveC. Sex - linked dominantD. Sex linked recessive

Answer» Correct Answer - A
508.

Usually the recessive character is expresse only when present in a double recessive condition. However, a single recessive gene can express itlself in human beings when the gene is present onA. Any autosomeB. X chromosome of femaleC. X chromosome of maleD. Either on autosome or X chromosomes

Answer» Correct Answer - C
509.

Point (Gene mutation) mutation invlvesA. InsertionB. Change in single base pairC. DuplicationD. Deletion

Answer» Correct Answer - B
510.

Define point mutation

Answer» Gene mutation that involves sunstition, deletion or insertion of single nitrogenous base is called point mutation.
511.

X-linked recessive gene isA. Always expressed in maleB. Always expressed in femaleC. LethalD. Sub lethal

Answer» Correct Answer - A
512.

Mendel obtained wrinkled seeds in pea due to deposition of sugars instead of starch. It was due to which enzyme :-A. AmylaaeB. InvertaseC. DiastaseD. Absence of starch branching enzyme

Answer» Correct Answer - D
513.

Mendel obtained wrinkled seeds in pea due to deposition of sugars instead of starch. It was due to which enzyme :-A. amylaseB. invertaseC. diastaseD. absence of starch-branching enzyme

Answer» Correct Answer - D
In round seeds `(R R//Rr)` Starch-Branching Enzyme-1 (SBE-1) is found but is absent from wrinkled seeds. In rr seeds, a small DNA segment interferes with SBE-1 activity so that starch is not formed and free sugar gets accumulated. Resulting high osmotic pressure in rr seeds leads to shrinkage and wrinkling.
514.

A man blames his wife for giving birth to a female child. Who is responsible for the sex of the child, the man or his wife?

Answer» Correct Answer - Man
515.

What is mutanges?

Answer» Environmental factors which induce mutations are called mutagens
516.

Write the genotype of offsprings produced between a homozygous blue eyed male (BB) and homozygous blck eyed female (bb)

Answer» Correct Answer - Bb
517.

Geneticist plot the relative locations of genes on chromosomes by which of these methodsA. Using powerful microscopesB. Calculating the number of genesC. Determining the frequency of crossing overD. Exposing animals to radiations

Answer» Correct Answer - C
518.

A geneticist interested in studying variations and patterns of inheritance in living beings prefers to choose organisms for experiments with shorter life cycle. Provide a reason.

Answer» It is so because it enables the geneticist to study many generations of that living being in a short period.
519.

Study the given pedigree chart and answer the questions that follow (i) Trait is autosomal recessive (True/False) (ii) Give the genotype of the members 3 and 4.

Answer» (i) True (e.g. sickle cell anaemia)
(ii) `3 rarr Aa, 4 rarr aa`
520.

Read statements `a-d`. (a) In transcription, adenosine pairs with uracil (b) Regulation of lac operon by repressor is positive regulation (c) Human genome has approximate 50,000 genes (d) Haemophilia is sex-linked recessive disease How many of above statement are correct ?A. TwoB. ThreeC. FourD. One

Answer» Correct Answer - A
521.

Blood grouping in human beings is controlled byA. 4 alleles in which `I^(A)` is dominatB. 3 alleles in which `I^(A)` and `I^(B)` is codominant, and i is recessiveC. 3 alleles in which none is dominantD. 3 alleles in which i is dominant.

Answer» Correct Answer - B
Blood groupping in human beings is controlled by 3 alleles in which A and B co-dominant and I is recessive.
522.

If Mandel had studied 7 traits using a plant with 12 chromosomes instead of 14, he would haveA. He would have mapped the chromosomeB. He would have discovered blending or incomplete dominanceC. He would not have discovered the law of independent assortmentD. He would have discovered sex-linkage

Answer» Correct Answer - C
If Mendel would have studied seven traits in 12 chromosomes instead of 14 he would not have discovered independent assortment.
523.

How many types of genetically different gametes will be produced by a heterozygous plant having genotype AABbCc?A. TwoB. FourC. SixD. Nine

Answer» Correct Answer - B
First pair AA is homozygous hence, it will contribute only one type of gene to gametes, Bb will yield two types of gametes-B and b similarly, Cc will yield two types of gametes-C and c. Hence, `1xx2xx2=4` types of gametes would be produced having the genotypes ABC, ABc, AbC and Abc.
524.

Kappa particles indicatesA. Nuclear inheritenceB. Cytoplasmic inheritenceC. MutationD. Nucleo-cytoplasmic inheritence

Answer» Correct Answer - B
(b) The transmission of traits from parents to offspring by means of plasmagenes is known as cytoplasmic inheritance.
525.

A self-fertilizing trihybrid plant formsA. 8 different gamets and 16 different zygotesB. 8 different gamets and 32 different zygotesC. 8 different gamets and 64 different zygotesD. 4 different gamets and 16 different zygotes

Answer» Correct Answer - C
(c) The offsprings shows 27:9:9:9:3:3:3:1 ratio is found in trihybrid cross.
526.

A self-fertilizing trihybrid plant formsA. 8 different gametes and 64 different zygotesB. 4 different gametes and 16 different zygotesC. 8 different gametes and 16 different zygotesD. 8 different gametes and 32 different zygotes

Answer» Correct Answer - A
527.

Doubling of the chromosomes is termed asA. DuplicationB. TansciptionC. TranslationD. None of these

Answer» Correct Answer - A
528.

Lampbrush chromosomes are visibleA. In diplotene of meiosisB. In prophase of meiosisC. In interphaseD. In metaphase of meiosis

Answer» Correct Answer - A
529.

Crossing over that results in genetic recombination in higher organisms occurs betweenA. Two daughter nucleiB. Two different nucleiC. Sister chromatids of a bivalentD. Non-sister chromatids of a bivalent

Answer» Correct Answer - D
530.

Assertion : Persons sufffering from haemophilia fall to produc blood cloting factor . VIII. Reason : Prothrombin producing plateles in such persons are found in very low concentraionA. If both the assertion and the reason are true and the reasons is a correct explanation of the assertionB. If both the assertion and reason are true but the reason is not a correct explanation of the assertionC. If the assertion is true but the reson is falseD. If both the assertion and reason are false

Answer» Correct Answer - C
Haemophilia is a blood disorder where the blood does not clot normally. Haemopilia A is the most common form, caused by a deficiency of blood clotting factor VIII. Haemophilia B is due a deficiency of blood clotting factor IX. Haemophilia is an hereditary disorder. In almost all cases. it is males that suffer the condition, although it is passed on by both females and males carrying the gene. Queen Victoria was a carrier of haemophilia A. It is also known as classical haemophilia and factor VIII deficiency haemophilia. Haemophilia B is also known as Factor IX haemophilia, and Christmas disease after the first patient diagnosed with it prothrombin producing platelets in such persons are not found in very low concentration.
531.

Assertion : In humans, the gamete contributed by the male determines wheter the child produced will be male or female Reason : Sex in humasn is a polygenic trait depending upon a cumulative efffect of some genes on X-chromosome and some on Y-chromosome .A. If both the assertion and the reason are true and the reasons is a correct explanation of the assertionB. If both the assertion and reason are true but the reason is not a correct explanation of the assertionC. If the assertion is true but the reson is falseD. If both the assertion and reason are false

Answer» Correct Answer - C
(c ) The sex of the child to be born is intially governed, by the chromosomal contribution of the father. All chromosomes are paired, and the Y is dominant over the X chromosome when combined with it. A child conceived will "therefore" be subject during development thereafter to a predisposition toward femaleness if receiving and X chromosome from the mother and an X chromosome from the father (XY), or towards maleness if receiveing an X chromosome from the mother but a Y chromosome from the father (XY) ."Therefore" sex in human is a monogenic not polygenic.
532.

If the number fo chromosomes in most body cells of a mammal is 40, the cells the seminiferous tubule will haveA. 40 chromosomesB. 20 chromosomesC. 10 chromosomesD. While some other will have 20

Answer» Correct Answer - D
(d) Reducation division takes plane during spermatogensiss spermatids and sperms will have haploid number of chromosomes.
533.

The exhange of one part of a chromosome to the other part of some or another chromosome is called Or The movement of gene from one linkage group to another is calledA. InversionB. MutationC. TranslocationD. Linkage

Answer» Correct Answer - C
(c ) Translocaton is kind of chrosomal rearrangement in which a block of gens from one linkage group is transferred to anthor linkage group is tranferred to another linkage group.
534.

Under which condition does, the law of independent assortment hold good any why?

Answer» The law of independent assortment holds goods only if the different gene pairs lie in the different chromosome pairs, because it is the chromosomes that sergerate during meiosis and not individual genes
535.

The movement of a gene from one linkage group to an other is calledA. Crossing overB. InversionC. DuplicationD. Translocation

Answer» Correct Answer - D
536.

What is true of law of independent assortment ?A. Applicable to all the dominant allelesB. Applicable to all genes on the same chromosomeC. Not applicable to genes present on the same chromosomeD. Applicable to all recessive alleles

Answer» Correct Answer - C
Law of independent assortment is not applicable to genes present on the same chromosomes.
537.

Linkage was discovered byA. BlakesleeB. SuttonC. MullerD. Bateson and Punnet

Answer» Correct Answer - D
Linkage was discovered by Bateson and Punnet.
538.

Sex linked genes were discovered byA. JohanssenB. MendelC. MorganD. Mulle.

Answer» Correct Answer - C
Sex-linked ganes were discovered by Morgan.
539.

Independent assortment is absent in case ofA. Genes located on the same chromosomeB. Genes located on homologous chromosomesC. Genes located on non-homologous chromosomesD. All of the above

Answer» Correct Answer - A
Independent assortment is absent in case of genes located on the same chromosome.
540.

Number of genotype found in `F_(2)` progeny of a dihybrid cross isA. 9B. 6C. 3D. 1

Answer» Correct Answer - A
Total number of genotypes = `3^(n)`
n-type of cross (for monohybrid n = 1, for dihybrid n = 2 and …. so on).
Number of genotypes found in `F_(2)` progeny of a dihybrid cross is 9.
541.

Mendelian recombinations are due toA. LinkageB. Independent assortmentC. MutationsD. Dominant traits

Answer» Correct Answer - B
Source of Mendelian recombinations is independent assortment.
542.

Assertion : A woman is capable of sueing a man of refusing to own a child, who has blood group O. The man has blood group B and woman has A. Reason : She is right as genetically, he can be the father of the child.A. If both A and R are true and R is the correct explanation of A.B. If both A and R are true and R is not the correct explanation of A.C. If A is true but R is falseD. If both A and R are false

Answer» Correct Answer - A
543.

Female heterogamy is found in (A) Birds (b)Grasshopper (C) Both (a) and (b) (D) Drosophilia

Answer» Correct Answer - A
544.

Male heterogamy is found is (a) Drosophilia (b)Humans (c) Grasshopper All of these

Answer» Correct Answer - D
545.

Name the two kinds of linkage.

Answer» Complete and incomplete
546.

A female with underdeveloped feminine character possessA. 47 chromosomesB. 45 + XOC. 49 chromosomesD. Trisomy of `21^("st")` chromosome

Answer» Correct Answer - B
547.

Which of the following abnormalities is due to autosomal dominant mutation ?A. Colour blindnessB. ThalassemiaC. Myotonic dystrophyD. Haemophilia

Answer» Correct Answer - C
548.

Why do grey body and red eyes occur in the same individula in Drosophila?

Answer» Because the genes of these traits lie in the same chromosome
549.

A parent having autosomal dominant disease then what will be the probability of diseased offspring irrespective of sex of the child?A. `90%`B. `10%`C. `50%`D. `100%`

Answer» Correct Answer - C
550.

Who showed that the genes lie in the chromosomes?

Answer» Morgan (1910), Bridges (1916)