Principles of Inheritance and Variation Test

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Principles of Inheritance and Variation Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

In blood group typing in human, if an allele contributed by one parent is IA and an allele contributed by the other parent is i, the resulting blood group of the offspring will be

A
A

B
O

C
AB

D
B

Solution

Blood group alleles IA and i is A. As allele A is dominant over the allele i. O blood group appear only when both the alleles are i.
Question 2
1 / -0

Inheritance of skin colour in human being is an example of

A
Monogenic inheritance

B
Mendelian inheritance

C
Polygenic inheritance

D
Complementary gene

Solution

Skin colour in human being is controlled by many genes so it is an example of polygenic inheritance.
Question 3
1 / -0

Which of the following is an example of co-dominance?

A
Sex-linkage in humans

B
Skin pigmentation in humans

C
Pink flowers of Snapdragon

D
The ABO blood groups in human

Solution

Co-dominance is the phenomenon that deviates from Mendel’s law of inheritance. Both the alleles appear in offspring instead of one as in Mendel’s experiment. ABO blood grouping in human being is example of co-dominance in which both IA and IB appear simultaneously to form AB blood type.
Question 4
1 / -0

A human male produces sperms with the genotypes AB ,Ab , aB , ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?

A
AABb

B
AABB

C
AaBb

D
AaBB

Solution

The genotype AaBb of a male produce gametes AB,Ab, aB and ab in equal proportion as the law of segregation.
Question 5
1 / -0

In Mirabilis jalapa when two F1 pink flowered plants were crossed with each other, the F2 generation produced 40 red, 80 pink and 40 white flowering plants. This a case of

A
Incomplete dominance

B
Epistatis

C
Duplicate genes

D
Lethal genes

Solution

F1pink flowered plants are heterozygous. When selfing is done the genotype and phenotype develops as 1:2:1 as 40 red, 80 pink and 40 white flowering plants.
Question 6
1 / -0

A person with unknown blood group under ABO system has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend, who has a valid certificate of his own blood type, offers for blood donation without delay. What would have been the type of blood group of the donor friend?

A
Type B

B
Type AB

C
Type A

D
Type O

Solution

A person with unknown blood group under ABO grouping should be given Type O blood group as O is universal donor and can be transfused to any person.
Question 7
1 / -0

In T. H. Morgan"s Experiment on Drosophilia what will be the result when F1 female flies are crossed with double recessive male files?

A
41.5 % parental combination, 58.5% recombination

B
60% parental combination, 40 % recombination

C
83% parental combination, 17% recombination

D
90 % parental combination, 10% recombination

Solution

When F1 female flies (Drosophila) obtained in crossed with double recessive male flies 83% parental combination are obtained along with 17% recombinant offspring are formed.
Question 8
1 / -0

ABO blood groups in humans are controlled by the gene I. It has three alleles - IA, IB and i . Since there are 3 different alleles, six different genotypes are possible. How many phenotypes occur?

A
Four

B
Two

C
Three

D
One

Solution

The three alleles - IA, IB and i will form four different kinds of blood group A, B, AB and O. as IA and IB are dominant and i is recessive in nature.
Question 9
1 / -0

Heterozygous tall plants were crossed with dwarf plants what will be the ratio of dwarf plants in the following progeny?

A
75 percent

B
100 percent

C
50 percent

D
25 percent

Solution

Heterozygous tall plant (Tt) is crossed with homozygous dwarf (tt) the percentage of dwarf plants is 50 percent.
Question 10
1 / -0

A cross between AaBB X aaBB yields a genotypic ratio of

A
All AaBb

B
3 AaBB : 1 aaBB

C
1 AaBB : 3aaBB

D
1 AaBB : 1 aaBB

Solution

Genotypic ratio of cross between AaBB and aaBB will be 1:1 as AaBB and aaBB in F1 generation.

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Re-Attempt Weekly Quiz Competition

Principles of Inheritance and Variation Test - 7

Result

Principles of Inheritance and Variation Test - 7

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SHARING IS CARING

Question 1

A

O

AB

B

Solution

Question 2

Monogenic inheritance

Mendelian inheritance

Polygenic inheritance

Complementary gene

Solution

Question 3

Sex-linkage in humans

Skin pigmentation in humans

Pink flowers of Snapdragon

The ABO blood groups in human

Solution

Question 4

AABb

AABB

AaBb

AaBB

Solution

Question 5

Incomplete dominance

Epistatis

Duplicate genes

Lethal genes

Solution

Question 6

Type B

Type AB

Type A

Type O

Solution

Question 7

41.5 % parental combination, 58.5% recombination

60% parental combination, 40 % recombination

83% parental combination, 17% recombination

90 % parental combination, 10% recombination

Solution

Question 8

Four

Two

Three

One

Solution

Question 9

75 percent

100 percent

50 percent

25 percent

Solution

Question 10

All AaBb

3 AaBB : 1 aaBB

1 AaBB : 3aaBB

1 AaBB : 1 aaBB

Solution

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