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1.

All gens located on the same chromosomeA. from different groups depending upon their relative distanceB. from one linkage groupC. will not from any linkage groupD. from interactive groups that dffect the phenotype

Answer» Correct Answer - B
All the genes, present on a particilar chormosome from al linkagr group. The number of linkage froup of a species correspond to the total number of different chromosomes of the species. It is not simply thr nomber of chromosomes in haploid set.
e.g., in human male = 22 pairs of autosomes + 1X-chrmosome + 1Y-choromosme i.e., 24 linkage groups and in femele = 22 pairs autosomes + 2X-chromosomes i.e., 23 linkage groups.
while options (a), (c ) and (d) are incorect.
Discussion
2.

Conditions of a karyotype `2n pm 1 and 2n pm 2` are calledA. aneuploidyB. polyploidyC. allopolyploidyD. monosomy

Answer» Correct Answer - A
Aneuploidy involves changes in chromosome nimber by additions or delecitions of less than a whole set. In theis case organism gains of loser onr or more chromosomes but not a complete set. Palyploidy is defined as the addition of entire set of chromosome. The polyploidy can be triploidy (3n), teraploidy (4n), pentaploidy (5n), etc
Allopolyploidy is the polyploidy in which chromosome sets are non-homologous. In other words we can say that the allopolyploids are derived from a stock which is heterzygous. Monosomy is the process in which one chromosome is removed from diploid set of chromosome (2n-1).
Discussion
3.

Which of the following will not result in variations among siblings ?A. Independent assortment of genesB. Crossing overC. LinkageD. Mutation

Answer» Correct Answer - C
Linkage will not result in variations among sibilings. Morgan carried out several dihybrid crosses in Drosphila to study genes that were sex-linked.
Morgan came to know that the genes were located on the X-chromosome and also observed that when the two genes in a dihybrid cross were situated on the same chromosome, the proportion of parental gene combinations were much higher than the non-parental type.
It indicates that due to the physical association of the two genes. Two genes. There will be no variations among siblings. Independnt assortment of genes means that allele pair separate during the formation of gametaes independently. It means that traits are transmitted to offspring independently of one another.
Crossing over is the exchange of genetic material between homologous chromosomes. It is one of the final phases of genetic recombinationl. Mutation is the audden inheritable change in genetic miterial of an organism which transfers to next generation.
Discussion
4.

Person having genotype `I^(A) I^(B)` would show the blood group as AB. Thus is because ofA. pleitropyB. codominanceC. segregationD. incomplete dominance

Answer» Correct Answer - B
A B O blood grouping in humans is an example of codominance. A B O blood groups are controlled by gene I. Gane I has three alleles `I^(A), I^(B) and I^(oi. lA) and I^(B)` are the dominat alleles. When `I^(A) and I^(B)` are present together, boht express equally and produce the surface antigens A and B, whereas I is the recessive allele and does not produce and antigen.
Pleitropy referred the genetic effect of a single gane on multiple phenotpic traits. incomplete dominance is a genetic term in which does not completely dominate another allele.
Segregation is the separation of all.ele during the process of gametogenesis. This is basis of reappearance of recessive character is `F_(2)`-generation.
Discussion