Q. No.A man of blood group A marries a woman of AB blood group. Which type of progeny would indicate that man is heterozygous A?
(1) AB
(2) A
(3) O
(4) B
(1) AB
(2) A
(3) O
(4) B
The gene for eye color in a certain organism has seven alleles. How many genotypic combinations are possible?
(1) 2
(2) 14
(3) 28
(4) 56
In chickens, gene R produces a rose-shaped comb, gene r produces a single comb, gene P produces pea-shaped comb and gene p produces a single comb. When P and R are both present in the genotype, the comb is walnut shaped. Two chickens with genotype RrPp are intercrossed. What will be the ratio of Walnut shaped, Rose shaped, Pea shaped and single comb progeny respectively:
(1) 3 : 1 : 1 : 3
(2) 1 : 1: 1 : 1
(3) 9 : 3 : 3 : 1
(4) 12 : 3 : 4
Two pure lines of corn have mean cob lengths of 9 and 3 inches respectively. The polygenes involved in this trait all exhibit additive gene action. Crossing these two lines is expected to produce a progeny with mean cob length [in inches] of:
(1) 12.0
(2) 7.5
(3) 6.0
(4) 2.75
Diseases that are caused by the malfunction of a pleiotropic gene are:
(1) cured by dietary restrictions
(2) reversible by gene therapy
(3) called as syndromes
(4) extremely rare
Out of a pair of monozygotic twins, one develops hare lip and the other does not. This can be an example of the genetic phenomenon of:
(1) Pleiotropy
(2) Incomplete penetrance
(3) Variable expressivity
(4) Incomplete dominance
The mapping of genes on chromosome was attempted by
(1) T. H. Morgan
(2) Walter Sutton
(3) Alfred Sturtevant
(4) Henking
Today ________ are extensively used as a _______ point in the sequencing of whole genome
(1) Pedigree charts, conclusive
(2) Genetic maps, starting
(3) Pedigree charts, starting
(4) Genetic maps, conclusive
The initial studies for sex determination were done over
(1) Plants
(2) Insects
(3) Humans
(4) Hen
The concept of X body was given by
(1) T. H. Morgan
(2) Walter Sutton
(3) Alfred Sturtevant
(4) Henking
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