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1.

Genes with multiple phenotypic effects are known asA. hypostatic genesB. duplicate genesC. pleiotropic genesD. complementary genes

Answer» Correct Answer - C
Discussion
2.

`"______"` is an example of X-linked recessive traitA. PhenylketonuriaB. HaemophiliaC. Cystic fibrosisD. Sickle-cell anaemia

Answer» Correct Answer - B
Discussion
3.

In XO type of sex determinationA. females produce two different types of gametesB. males produce two different types of gametesC. females produce gametes with Y chromosomeD. males produce gametes with Y chromosome

Answer» Correct Answer - B
Discussion
4.

Assertion : The maxiumum frequency of recombination, that can result from crossing over between linked genes is 50 percent Reason : Linked genes shown higher frequency of crossing over if distance between them is longer.

Answer» Correct Answer - B
Discussion
5.

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

Answer» Correct Answer - B
Discussion
6.

A cross between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the plants ?A. TT and TtB. Tt and TtC. TT and TTD. Tt and tt

Answer» Correct Answer - B
Discussion
7.

Match column I with column II and select the correct option from the given codes `{:(,"Column I",,"Column II"),("A.","Autopolyploidy","(i)","2n+1"),("B.","Trisomy","(ii)","AAAA"),("C.","Allipolyploidy","(iii)","AABB"),("D.","Nullisomy","(iv)","2n-2"):}`A. A-(ii),B-(i),C-(iii),D-(iv)B. A-(iv),B-(i),C-(ii),D-(iii)C. A-(ii),B-(iv),C-(iii),D-(i)D. A-(ii),B-(i),C-(iv),D-(iii)

Answer» Correct Answer - A
Discussion
8.

Match column I with column II and select the correct option from the given codes `{:(,"Column I",,"Column II"),("A.","Gregor J, Mendel","(i)","Chromosomal theory of inheritance"),("B.","Sutton and Boveri","(ii)","Laws of inheritance"),("C.","Henking","(iii)","Drosophila"),("D.","Morgan","(iv)","Discovered X-body"):}`A. A-(ii),B-(i),C-(iv),D-(iii)B. A-(iv),B-(i),C-(ii),D-(iii)C. A-(iv),B-(ii),C-(i),D-(iii)D. A-(ii),B-(iii),C-(iv),D-(i)

Answer» Correct Answer - A
Discussion
9.

Point mutation may occur due toA. alteration in DNA sequenceB. change in a single base pair of DNAC. deletion of a segment of DNAD. gain of a segment in DNA

Answer» Correct Answer - B
Discussion
10.

Select the correct statements regarding honeybees (i) The queen bee and the worker bees develop from fertilised eggs and are sexually females (ii) Males (drones) develop parthenogenetically from unfertilised eggs (iii) Queen bee feeds upon royal jelly and the worker bees feed upon bee bread.A. (i) and (ii)B. (ii) and (iii)C. (i) and (iii)D. (i),(ii) and (iii)

Answer» Correct Answer - D
Discussion
11.

Assertion : Sickle-cell anaemia is an autosome-linked recessive disorder that can be transmitted if both parents are heterozygous for the gene Reason : In sickle-cell anaemia, haemoglobin molecule undergoes polymerisation under low oxygen tension causing the change in shape in RBC

Answer» Correct Answer - B
Discussion