Principles of Inheritance and Variation Test

Result

Principles of Inheritance and Variation Test - 72

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Weekly Quiz Competition

Question 1
1 / -0

Select the incorrect statement regarding the pedigree analysis.

A
Solid symbols show only unaffected individuals.

B
Proband is the person from which case history starts.

C
It is useful for genetic counsellors.

D
It is an analysis of traits in several generations of a family.
Question 2
1 / -0

Choose the correct answer from the alternatives given.

A tobacco plant heterozygous for a recessive character is self-pollinated and 1200 seeds are subsequently germinated. How many seedlings would have the parental genotype?

A
1250

B
600

C
300

D
2250
Question 3
1 / -0

Experimental verification of chromosomal theory of inheritance was done by

A
Sutton and Boveri

B
Morgan et al

C
Henking

D
Karl Correns
Question 4
1 / -0

Rate of mutation is affected by _______________.

A
Temperature

B
X-rays

C
Gamma rays

D
All of these

Solution

Any extracellular physical or chemical factor which can cause mutations or increase the frequency of mutations in organisms is called mutagen. They include temperature and high energy radiations such as X-rays, ultra-violet rays and gamma rays. Therefore, all of the given options affect the rate of mutation.
Question 5
1 / -0

Which one is the incorrect match?

A

B

C

D
Question 6
1 / -0

Choose the correct answer from the alternatives given.

What is the probability of production of dwarf offsprings in a cross between two heterozygous tall pea plants?

A
Zero

B
50%

C
25%

D
100%

Solution

Cross between two heterozygous tall pea plants can be shown as follows :
Hence, the probability of production of dwarf offsprings is 25% and tall offsprings is 75%.
Question 7
1 / -0

Which of the following cross will give tall and dwarf pea plants in the same proportions?

A
$$Tt \, \times \, tt$$

B
$$Tt \, \times \, Tt$$

C
$$TT \, \times \, Tt$$

D
$$tt \, \times \, tt$$

Solution

This is an example of a test cross in which a cross is made between heterozygous tall and homozygous dwarf individuals, tall and dwarf plants are obtained in the same proportions.
So, the correct answer is 'Tt×tt'
Question 8
1 / -0

Choose the correct answer from the alternatives given.

How many types of gametes can be produced by a diploid organism who is heterozygous for 4 loci?

A
4

B
8

C
16

D
32

Solution

Types of gametes = 2 where n is number of heterozygous lad. Thus, gametes produced by a diploid organism could be $$2^4 \, = \, 16$$.
Question 9
1 / -0

Study the given pedigree chart showing the inheritance of an X-linked trait controlled by gene r.
What will be the genotypes of individuals A, B, C, and D respectively?

A
$$XX$$, $$X^rY$$, $$X^rX$$, $$XY$$

B
$$X^rX^r$$, $$XY$$, $$XX$$, $$XY$$

C
$$X^rX$$, $$X^rY^r$$, $$X^rX^r$$, $$X^rY$$

D
$$XX$$, $$X^rY^r$$, $$XX$$, $$XY$$
Question 10
1 / -0

Fused ear lobes appear En the progeny due to an autosomal recessive gene. Work out the genotypes of members in the given pedigree.

A
I-2-aa, II-3-Aa, III-1-Aa

B
I-2-aa, II-3-AA, III-1-AA

C
I-2-Aa, II-3-Aa, III-1-Aa

D
I-2-aa, II-3-Aa, III-1-AA

Solution

Given pedigree chart for fused ear lobes (autosomal recessive trait) can be explained as follows