In guinea pigs, black coat color is a dominant trait and white is a recessive trait. When heterozygous black pigs are intercrossed the chance of the first two offspring being black is:
75 %
56 %
44 %
6 %
The minimum progeny population size allowing for random union of all kinds of gametes from AaBbCc parents is:
9
16
27
64
How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE?
4
8
32
(1) 1 : 1
(3) 1 : 1 : 1 : 1
(2) 3 : 1
(4) 9 : 3 : 3 : 1
Two heterozygous round yellow seeded pea plants are intercrossed. In the progeny, the trait for seed shape will segregate in the ratio:
Given the parents AABBCc × AabbCc, assume simple dominance and independent assortment. What proportion of the progeny will be expected to phenotypically resemble the first parent?
1/4
1/8
3/4
3/8
In a cross between AABB X aabb, the ratio of F2 genotypes between AABB, AaBB, Aabb and aabb would be:
9 : 3 : 3 : 1
2 : 1 : 1 : 2
1 : 2 : 2 : 1
7 : 5 : 3 : 1
Which of the following terms best describes when the phenotype of the heterozygote differs from the phenotypes of both homozygotes?
Incomplete dominance
Multiple alleles
Codominance
Epistasis
A man of blood group A marries a woman of AB blood group. Which type of progeny would indicate that man is heterozygous A?
AB
A
O
B
The gene for eye color in a certain organism has seven alleles. How many genotypic combinations are possible?
2
14
28
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:
3 : 1 : 1 : 3
1 : 1: 1 : 1
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:
12.0
7.5
6.0
2.75
Diseases that are caused by the malfunction of a pleiotropic gene are:
cured by dietary restrictions
reversible by gene therapy
called as syndromes
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:
Pleiotropy
Incomplete penetrance
Variable expressivity
The mapping of genes on chromosome was attempted by
T. H. Morgan
Walter Sutton
Alfred Sturtevant
Henking
Today ________ are extensively used as a _______ point in the sequencing of whole genome
Pedigree charts, conclusive
Genetic maps, starting
Pedigree charts, starting
Genetic maps, conclusive
The initial studies for sex determination were done over
Plants
Insects
Humans
Hen
The concept of X body was given by
Which of the following statements are correct regarding Chromosomal basis of sex determination?
(i) The mechanism of sex determination in insects is of XO type.
(ii) XX insect is female while XO insect is male.
(iii) The X chromosome is called sex chromosome because it was involved in sex determination.
(iv) Grasshopper has XY type of sex determination.
(v) Man has XX type of sex determination.
(iv), (v)
(i), (ii), (iii), (iv), (v)
(i), (ii), (iii)
(i), (iv), (v)
Among human males _______ chromosome is present but its counterpart is _____ and called ______ chromosome.
Y, bigger, Z
X, smaller, Z
X, smaller, Y
Z, bigger, X
In which of the following male heterogamety is not observed?
Birds
(1) and (2)
In which of the following female heterogamety is not observed?
(1) and (3)
Which of the following matches is wrong?
Birds- ZZ(male)- ZW(female)
Drosophila- XY(male)- XX(female)
Humans- XY (male), XX (female)
Cockroach- - XZ(male)- ZZ(female)
Which of the following statement is correct with respect to human sex determination?
The genetic makeup of egg determines the sex of child.
Female produces two types of ovums and males produce only one type of sperm.
Each pregnancy has more probability of male child than of female.
Out of 23 pairs of chromosomes, 22 are same both in males and females.
Mutation causes
alterations at protein level
changes in genotype only
changes in phenotype
both (2) and (3)
Sickle cell anaemia is a classic example of
Point mutation
silent mutation
Frame shift mutation
non sense mutation
In which of the following one may observe variation in DNA?
Fragmentation
Budding
Amitosis
mutation
If a normal female has a sickle cell anaemic child what can be the probable genotype of that gene in that female?
AA
aa
Aa
both (1) and (3)
If the female has three boys in her first three pregnancy. What are the chances of getting female child this time?
25%
50%
75%
20%
If a haemophilic female who marries a normal male gives birth to a male child, then what are the chances of boy being normal? (a hypothetical situation but it won’t happen practically)
0%
50 %
In ABO blood grouping how many genotypes show co-dominance?
1
3
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