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Free download in PDF Mendelian and Post Mendelian Genetics Objective Type 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.
21
A gene pair hides the effect of another gene. The phenomenon is called
A
dominance
B
segregation
C
epistasis
D
mutation
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22
In hybridization, Tt x tt gives rise to the progeny of ratio
A
2 : 1
B
1 : 2 : 1
C
1:1
D
1 : 2
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23
When a single gene influences more than one trait it is called
A
pseudodominance
B
pleiotrophy
C
epistasis
D
none of these
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24
If Mendel had studied the seven traits using a plant with 12 chromosomes instead of 14, in what way would his interpretation have been different?
A
he would not have discovered the law of independent assortment
B
he would have discovered sex linkage
C
he could have mapped the chromosome
D
he would have discovered blending or incomplete dominance
View Answer
Answer: he would not have discovered the law of independent assortment
25
Crossing over in diploid organism is responsible for
A
segregation of alleles
B
recombination of linked alleles
C
dominance of genes
D
linkage between genes
View Answer
Answer: recombination of linked alleles
26
How many different types of genetically different gametes will be produced by a heterozygous plant having the genotype AABbCc?
A
six
B
nine
C
two
D
four
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27
A fruit fly is heterozygous for sex-linked genes, when mated with normal female fruit fly, the males specific chromosome will enter egg cell in the proportion
A
3 : 1
B
-7:1
C
1:1
D
2.: 1
View Answer
28
The polygenic genes show
A
different karyotypes
B
different genotypes
C
different phenotypes
D
none of these
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Answer: different phenotypes
29
When two dominant independently assorting genes react with each other, they are called
A
collaborative genes
B
complementary genes
C
duplicate genes
D
supplementary genes
View Answer
Answer: complementary genes
30
When two genetic loci produce identical phenotypes in cis and trans position, they are considered to be
A
multiple alleles
B
the parts of same gene
C
pseudoalleles
D
different genes
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31
The phenomenon, in which an allele of one gene suppresses the activity of an allele of another gene, is known as
A
epistasis
B
dominance
C
suppression
D
inactivation
View Answer
32
Of both normal parents, the chance of a male child becoming colour blind are
A
no
B
possible only when all the four grand parents had normal vision
C
possible only when father’s mother was colour blind
D
possible only when mother’s father was colour blind
View Answer
Answer: possible only when mother’s father was colour blind.
33
Mr. Kapoor has Bb autosomal gene pair and d allele sex-linked. What shall be proportion of Bd in sperms?
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34
Which of the following is suitable for experiment on linkage?
A
aaBB x aaBB
B
AABB x aabb
C
AaBb x AaBb
D
AAbb x AaBB
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35
Of a normal couple, half the sons are haemophiliac while half the daughters are carriers. The gene is located on
A
X-chromosome of father
B
Y-chromosome of father
C
one X-chromosome of mother
D
both the X-chromosomes of mother
View Answer
Answer: one X-chromosome of mother
36
Two dominant nonallelic genes are 50 map units apart. The linkage is
A
cis type
B
trans type
C
complete
D
absent/incomplete
View Answer
Answer: absent/incomplete
37
A polygenic inheritance in human beings is
A
skin colour
B
phenylketonuria
C
colour blindness
D
sickle cell anaemia
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38
Mendel studied inheritance of seven pairs of traits in Pea which can have 21 possible combinations.
If you are told that in one of these combinations, independent assortment is not observed in later studies, your reaction will be
A
independent assortment principle may be wrong
B
mendel might not have studied all the combinations
C
it is impossible
D
later studies may be wrong
View Answer
Answer: mendel might not have studied all the combinations
39
A child of O-group has B-group father. The genotype of father will be
A
I°I°
B
IBIB
C
IAIB
D
IBI°
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40
According to mendelism which character shows dominance?
A
terminal position of flower
B
green colour in seed coat
C
wrinkled seeds
D
green pod colour
View Answer
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