Principles of Inheritance and Variation Test

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Principles of Inheritance and Variation Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

A self-fertilizing trihybrid plant forms:

A
4 different gametes and 16 different zygotes

B
8 different gametes and 16 different zygotes

C
8 different gametes and 64 different zygotes

D
8 different gametes and 32 different zygotes

Solution

Self-fertilized plants are pure line and trihybrid plant will form 8 different kinds of gametes. These gametes undergo independent assortment to form 64 combination of zygote.
Question 2
1 / -0

In the hexaploid wheat, the haploid (n) and basic (X) numbers of chromosomes are

A
n = 21 and X =14

B
n = 7 and X =21

C
n = 21 and X = 7

D
n = 21 and X = 21

Solution

In hexaploid wheat, the basic number of chromosome is 7 and haploid in hexaploid is 21 and as diploid will have 7x6 = 42 chromosome. Therefore, n=21 and X=7.
Question 3
1 / -0

A couple has four daughters. The percentage probability of fifth child to be a Daughter is

A
50

B
10

C
75

D
100

Solution

In human beings sex is determined by types of sperm that fertilize the ovum. Two kinds of sperms are formed half carrying x and half carrying y chromosome. Hence probability of male or female is always same that is 50% each.
Question 4
1 / -0

Incomplete linkage in Drosophila produces off springs with parental and non-parental combinations. What is the percentage of non-parental combination of Drosophila?

A
17 percent

B
85 percent

C
83 percent

D
15 percent

Solution

Drosophila produces off springs with parental and non-parental combinations. Due to incomplete linkage the percentage of parental and non-parental offspring is 83% and 17% respectively.
Question 5
1 / -0

What will be expected blood groups in the off spring when there is a cross between AB blood group mother and heterozygous B blood group father?

A
25% O, 25% A, 50%B

B
50% AB, 25% A, 25%B

C
25% AB, 50% O, 25%A

D
25% AB, 25% A, 50%B

Solution

AB blood group of mother have two alleles IA and IB. The heterozygous B blood group of father has alleles IB and i. The possible outcome are IA IB,IAi,IBIB and IBi. That form AB, A, B and B blood group respectively.
Question 6
1 / -0

Assertion: An organism with lethal mutation may not even develop beyond the zygote stage.
Reason: All types of gene mutations are lethal.

A
Both assertion and reason are false

B
Both assertion and reason are true but the reason is not the correct explanation of the assertion

C
Both assertion and reason are true and the reason is the correct explanation of the assertion

D
Assertion is true statement but reason is false

Solution

An organism with lethal mutation may not even develop beyond zygote stage due to change in gene but all kinds of mutations are not lethal. Mutation is main source of variation essential for evolution.
Question 7
1 / -0

Which of the following is not a deviation from Medelism?

A
Incomplete dominance

B
Dihybrid cross

C
Multiple alleles

D
ABO blood grouping

Solution

The events that do not follow Mendel’s laws of inheritance are called deviation from Medelism. Incomplete dominance, ABO blood grouping and multiples alleles are deviation from Mendelism.
Question 8
1 / -0

In ABO blood grouping, when gene IA and IB is present together. The blood group of the individual is

A
A

B
B

C
AB

D
O

Solution

Blood Group in human beings is determined by three genes. The person having gene IA and IB is present together will have blood group AB due to co-dominance.
Question 9
1 / -0

Assertion: The cross between red and white flower bearing snapdragon plants results into pink coloured flower.
Reason: Incomplete dominance of red and white flower results into pink coloured flower.

A
Assertion is correct but reason is incorrect

B
Assertion is incorrect but reason is correct

C
Both assertion and reason are incorrect

D
Both assertion and reason are correct

Solution

In Snapdragon flower, cross between true breeding white and red coloured flower produce pink coloured flower in F1generation. This happens due to incomplete dominance of alleles over the other.
Question 10
1 / -0

Deviation from Medelism’s occurs due to
a. Multiple alleles
b. Co dominance
c. Linkage and crossing over
d. Independent assortment

A
All are correct

B
Only a, b and c is correct

C
Only b and c are correct

D
Only b and c is correct

Solution

Deviation from Medelism’s occurs due to co-dominance, multiple alleles, incomplete dominance in which single gene is not completely dominant over the other to produce dominant trait.

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Re-Attempt Weekly Quiz Competition

Principles of Inheritance and Variation Test - 8

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Principles of Inheritance and Variation Test - 8

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SHARING IS CARING

Question 1

4 different gametes and 16 different zygotes

8 different gametes and 16 different zygotes

8 different gametes and 64 different zygotes

8 different gametes and 32 different zygotes

Solution

Question 2

n = 21 and X =14

n = 7 and X =21

n = 21 and X = 7

n = 21 and X = 21

Solution

Question 3

50

10

75

100

Solution

Question 4

17 percent

85 percent

83 percent

15 percent

Solution

Question 5

25% O, 25% A, 50%B

50% AB, 25% A, 25%B

25% AB, 50% O, 25%A

25% AB, 25% A, 50%B

Solution

Question 6

Both assertion and reason are false

Both assertion and reason are true but the reason is not the correct explanation of the assertion

Both assertion and reason are true and the reason is the correct explanation of the assertion

Assertion is true statement but reason is false

Solution

Question 7

Incomplete dominance

Dihybrid cross

Multiple alleles

ABO blood grouping

Solution

Question 8

A

B

AB

O

Solution

Question 9

Assertion is correct but reason is incorrect

Assertion is incorrect but reason is correct

Both assertion and reason are incorrect

Both assertion and reason are correct

Solution

Question 10

All are correct

Only a, b and c is correct

Only b and c are correct

Only b and c is correct

Solution

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