Principles of Inheritance and Variation Test

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Principles of Inheritance and Variation Test - 67

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Question 1
1 / -0

The pedigree shows

A
Dominant inheritance

B
Recessive inheritance

C
Sex linked recessive inheritance

D
Cytoplasmic inheritance
Solution
Correct Answer: A

Explanation of correct answer:
Dominant traits are continuous, they don’t skip a generation.
Dominant inheritance is a way a genetic trait or condition can be passed down from parent to child.
In dominant inheritance, at least one parent of the affected person is affected.
In the given diagram parents are heterozygous dominant and the unaffected progeny is homozygous recessive.

Hence, the pedigree shows dominant inheritance.
Question 2
1 / -0

The phenomena of coupling and repulsion was explained by ________________.

A
Bateson and Punnett

B
Beadle and Tatum

C
Bridges

D
Morgan
Question 3
1 / -0

Total number of phenotypic group for human skin colour is

A
8

B
7

C
4

D
16

Solution

Answer is option B i.e. "7"
Human skin phenotype is an example of polygenic characteristic which shows continuous variation. Human skin is controlled by six genes each with it's own allele. Thee alleles control the production of melanin. These genes produces eight different types of gametes and these gametes combine with each other in 64 different ways resulting in a total of seven skin color.
Question 4
1 / -0

Given is a pedigree chart. Find the genotype of $$z$$ individual

A
$$Aa$$

B
$${X}Y$$

C
$${X}^{d}Y$$

D
$$aa$$
Question 5
1 / -0

In a typical monohybrid cross, plants to which generation show same phenotype and genotype.

A
Parental generation

B
First filial generation

C
Second filial generation

D
Third filial generation
Question 6
1 / -0

The hybrid ratio $$9:3:4$$ comes in case/s of _________________.

A
Recessive epistasis ratio

B
Supplementary gene ratio

C
Both (a) and (b)

D
Dominant epitasis
Question 7
1 / -0

Sickle cell anaemia is a case of _____________.

A
Silent mutation

B
Transversion

C
Frame shift mutation

D
None of these

Solution

Sickel cell anaemia is caused due to transversion. In this, T is substituted for A in hemoglobin gene.
Question 8
1 / -0

Which one of the following discoveries provided the strongest evidence for the chromosome theory of heredity?

A
Discovery of sex chromosomes

B
Discovery of polyploidy

C
Discovery of giant chromosomes

D
Discovery of supernumerary chromosomes
Question 9
1 / -0

Multiple phenotypic expression is seen in ____________.

A
Pleitropy

B
Incomplete dominance

C
Multiple allelism

D
Polygenic inheritance
Solution
- Pleiotropy occurs when one gene influences two or more seemingly unrelated phenotypic traits.
- Such a gene that exhibits multiple phenotypic expression is called a pleiotropic gene.
- So, (A) is the correct answer.
Question 10
1 / -0

When a pea plant with yellow round seeds was crossed with a plant with green wrinkled seeds, yellow round, yellow wrinkled, green round and green wrinkled seed-producing varieties were obtained in almost equal numbers. The genotypes of the parents in this cross are

A
YYRR $$\times$$ yyrr

B
YyRr$$\times$$ yyrr

C
YYRr$$\times$$ yyrr

D
YyRR$$\times$$ yyrr

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Re-Attempt Weekly Quiz Competition

Principles of Inheritance and Variation Test - 67

Result

Principles of Inheritance and Variation Test - 67

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SHARING IS CARING

Question 1

Dominant inheritance

Recessive inheritance

Sex linked recessive inheritance

Cytoplasmic inheritance

Solution

Question 2

Bateson and Punnett

Beadle and Tatum

Bridges

Morgan

Question 3

8

7

4

16

Solution

Question 4

$$Aa$$

$${X}Y$$

$${X}^{d}Y$$

$$aa$$

Question 5

Parental generation

First filial generation

Second filial generation

Third filial generation

Question 6

Recessive epistasis ratio

Supplementary gene ratio

Both (a) and (b)

Dominant epitasis

Question 7

Silent mutation

Transversion

Frame shift mutation

None of these

Solution

Question 8

Discovery of sex chromosomes

Discovery of polyploidy

Discovery of giant chromosomes

Discovery of supernumerary chromosomes

Question 9

Pleitropy

Incomplete dominance

Multiple allelism

Polygenic inheritance

Solution

Question 10

YYRR $$\times$$ yyrr

YyRr$$\times$$ yyrr

YYRr$$\times$$ yyrr

YyRR$$\times$$ yyrr

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