Principles of Inheritance and Variation Test

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Principles of Inheritance and Variation Test - 92

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Weekly Quiz Competition

Question 1
1 / -0

Who amongst the following scientists rediscovered Mendel's work?

A
T.H. Morgan

B
W. Bateson

C
E.Strasburger

D
Von Tschermak

Solution

Mendel’s laws of inheritance was rediscovered by Hugo de Vries, Carl Correns, and T.Schemark independently.
So, the correct option is ‘Von Tschemark’.
Question 2
1 / -0

In a polygenic cross AaBbCc $$\times$$ AaBbCc, the phenotypic ratio of offspring is 1 : 6 : X : 20 : X : 6 : 1. What is the value of 'X'?

A
3

B
7

C
15

D
25
Question 3
1 / -0

Genotypic ratio of monohybrid cross is

A
3 : 1

B
1 : 2 : 1

C
1 : 1

D
9 : 3 : 3 : 1

Solution

A monohybrid cross is conducted between pure tall plant(TT) with pure dwarf plant(tt), in the F1 generation tall plants(Tt) are formed. When this plant is subjected to self pollinatin, in the F₂ generation 3 tall plants and 1 dwarf plant is formed. The ratio between tall and dwarf plants is 3:1 and 1 plant with TT, 2 plants with Tt, 1 plant with tt are formed. The genotypic ratio is 1:2:1.
So, the correct option is ‘1:2:1’.
Question 4
1 / -0

Mendel's work was got republished in 'Flora' by

A
De Vries

B
Tschermak

C
Correns

D
All the above.

Solution

Mendel’s law of inheritance were rediscovered by Hugo de vries, Tschemark, Correns. Hugo de vries republished the Mendel’s work in ‘Flora’.
So, the correct option is ‘De vries’.
Question 5
1 / -0

Which one is a dominant trait out of the characters chosen by Mendel?

A
Pod Colour - Yellow

B
Seed Colour - White

C
Flower Position - Axillary

D
Plant Height - Dwarf.

Solution

A.Pod colour – Yellow – Recessive trait

B.Seed colour – White – Recessive trait

C.Flower position – Axillary – Dominant trait

D.Plant height – Dwarf – Recessive trait
So, the correct option is ‘Flower position – Axillary’.
Question 6
1 / -0

In quantitative inheritance, when a character is controlled by two pairs of genes, the ratio obtained in $$F_2$$ generation is .............

A
1 : 2 : 1

B
1 : 4 : 6 : 4 : 1

C
9 : 3 : 3 : 1

D
1 : 6 : 15 : 20 : 15 : 6 : 1.
Question 7
1 / -0

Chromosomal theory of inheritance was proposed by ______________.

A
Gregor Mendel

B
Hugo de vries

C
Bridges

D
Sutton and Boveri

E
Bateson and Punnett
Question 8
1 / -0

Total 512 seeds are collected from the cross$$ WwYy \times WwYy$$. Find the number of plants produced with first dominant and second recessive.

A
288

B
96

C
32

D
320

Solution

From the given Punnett square of WwYy x WwYy cross, 3 out of the 16 progenies have first dominant and second recessive traits, marked in red.
Thus out of 512 seeds collected, (512 x 3) / 16 = 96 plants produced will be with first dominant and second recessive traits.
So the correct option is '96'.
Question 9
1 / -0

In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree.

A
X-linked recessive

B
Autosomal recessive

C
X-linked dominant

D
Autosomal dominant
Solution
Correct Option: C
Explanation:
The following information can be derived from the provided pedigree chart:
1. The feature occurs with equal frequency in both male and female individuals.
2. Affected offspring are born to unaffected or healthy parents.
3. The feature skips generations, i.e. it does not appear in every generation.
This information indicates that this pedigree chart depicts an autosomal recessive condition.
Hence, the human pedigree depicted by the filled symbol represents the affected individual which is an autosomal recessive type.
Question 10
1 / -0

Which of the following is true for the given pedigree?

A
Parents are homozygous

B
Parents are heterozygous

C
Parents are homozygous recessive

D
Trait is Y-linked
Solution
A. Correct option -B
B. Explanation for correct option -B
Some people have their ear lobes attached to the side of the head and some people have free ear lobes.
This is due to a gene that is dominant for unattached earlobes and recessive in the case of attached earlobes.
So, attached ear lobes are recessive in humans.
When the parents are heterozygous, some of the children will have attached earlobes and the others will have free earlobes.
Option A: If the parent is homozygous dominant then none of the children will have attached earlobes.
Option C: If the parents are homozygous recessive then all children will have attached earlobes.
Option D: If the trait was Y-linked then only male children would be affected.

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Re-Attempt Weekly Quiz Competition

Principles of Inheritance and Variation Test - 92

Result

Principles of Inheritance and Variation Test - 92

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SHARING IS CARING

Question 1

T.H. Morgan

W. Bateson

E.Strasburger

Von Tschermak

Solution

Question 2

3

7

15

25

Question 3

3 : 1

1 : 2 : 1

1 : 1

9 : 3 : 3 : 1

Solution

Question 4

De Vries

Tschermak

Correns

All the above.

Solution

Question 5

Pod Colour - Yellow

Seed Colour - White

Flower Position - Axillary

Plant Height - Dwarf.

Solution

Question 6

1 : 2 : 1

1 : 4 : 6 : 4 : 1

9 : 3 : 3 : 1

1 : 6 : 15 : 20 : 15 : 6 : 1.

Question 7

Gregor Mendel

Hugo de vries

Bridges

Sutton and Boveri

Bateson and Punnett

Question 8

288

96

32

320

Solution

Question 9

X-linked recessive

Autosomal recessive

X-linked dominant

Autosomal dominant

Solution

Question 10

Parents are homozygous

Parents are heterozygous

Parents are homozygous recessive

Trait is Y-linked

Solution

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