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Free download in PDF Mendelian and Post Mendelian Genetics Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
A gene pair hides the effect of another. The phenomenon is
[A]
epitasis
[B]
dominance
[C]
mutation
[D]
none of these
(2)
In a cross between AABB x aabb, the ratio of F2 genotypes between AABB, AaBB, Aabb and aabb would be
[A]
9 : 3 : 3 : 1
[B]
2 : 1 : 1 : 2
[C]
1 : 2 : 2 : 1
[D]
7 : 5 : 3 : 1
(3)
Segregation of Mendelian factors (no linkage, no crossing over) occurs during
[A]
anaphase I
[B]
anaphase II
[C]
diplotene
[D]
metaphase I.
(4)
An organism with two identical alleles is
[A]
dominant
[B]
hybrid
[C]
heterozygous
[D]
homozygous
(5)
A man of A-blood group marries women of AB blood group. Which type of progeny would indicate that man is heterozygous A?
[A]
AB
[B]
A
[C]
O
[D]
B.
(6)
Multiple alleles control inheritance of
[A]
phenylketonuria
[B]
colour blindness
[C]
sickle cell anaemia
[D]
blood groups
(7)
First geneticist/father of genetics was
[A]
De Vries
[B]
Mendel
[C]
Darwin
[D]
Morgan
(8)
Mendel’s last law is
[A]
segregation
[B]
dominance
[C]
independent assortment
[D]
polygenic inheritance
Answer: independent assortment
(9)
A dihybrid condition is
[A]
segregation
[B]
dominance
[C]
independent assortment
[D]
polygenic inheritance
Answer: polygenic inheritance
(10)
Blue eye colour is recessive to brown eye colour. A brown eyed man whose mother was blue eyed marries a blue-eyed woman. The children will be
[A]
both blue eyed and brown eyed 1 : 1
[B]
all brown eyed
[C]
all blue eyed
[D]
blue eyed and brown eyed 3:1.
Answer: both blue eyed and brown eyed 1 : 1
(11)
The allele which is unable to express its effect in the presence of another is called
[A]
co dominant
[B]
supplementary
[C]
complementary
[D]
recessive
(12)
RR (Red) Antirrhinum is crossed with white (WW) one. Offspring RW are pink. This is an example of
[A]
dominant-recessive
[B]
incomplete dominance
[C]
hybrid
[D]
supplementary genes
Answer: incomplete dominance
(13)
Cross between AaBB and aaBB will form
[A]
1 AaBB : laaBB
[B]
All AaBB
[C]
3AaBB : laaBB
[D]
1 AaBB : 3aaBB
(14)
In a genetic cross having recessive epistasis, F2 phenotypic ratio would be
[A]
9:6:1
[B]
15 : 1
[C]
9 : 3 : 4
[D]
12 : 3 : 1
(15)
ABO blood group system is due to
[A]
Multifactor inheritance
[B]
Incomplete dominance
[C]
Multiple allelism
[D]
Epistasis
Answer: Multiple allelism
(16)
tt mates with Tt. What will be characteristic of offspring?
[A]
75% recessive
[B]
50% recessive
[C]
25% recessive
[D]
All dominant
(17)
A normal green male Maize is crossed with albino female. The progeny is albino because
[A]
trait for a albinism is dominant
[B]
the albinos have biochemical to destroy plastids derived from green male
[C]
plastids are inherited from female parent
[D]
green plastids of male mus. have mutated.
Answer: plastids are inherited from female parent
(18)
Two linked genes a and b show 20% recombination, the individuals of a dihybrid cross between ++/+ + x ab/ab shall show gametes
[A]
++ 80 : ab : 20
[B]
++ 50 : ab : 50
[C]
++ 40 : ab 40 : + a 10 : + b : 10
[D]
++ 30 : ab 30 : + a 20 : + b : 20
Answer: ++ 40 : ab 40 : + a 10 : + b : 10
(19)
Which contribute to the success of Mendel?
[A]
qualitative analysis of data
[B]
observation of distinct inherited traits
[C]
his knowledge of biology
[D]
consideration of one character at one time.
Answer: his knowledge of biology
(20)
An allele is dominant if it is expressed in
[A]
both homozygous and heterozygous states
[B]
second generation
[C]
heterozygous combination
[D]
homozygous combination
Answer: both homozygous and heterozygous states
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