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

'Gametes are never hybrid'. It is a statement of the law of

A
dominance

B
segregation

C
independent assortment

D
random fertilisation

Solution

The law of segregation states that the two alleles for a heritable character segregate (separate from each other) during gamete formation and end up in different gametes. So, "gametes are never hybrid" is a statement of the law of segregation.
Question 2
1 / -0

A Barr body is present in a male child. The syndrome most likely to occur is

A
Klinefelter's syndrome

B
Down's syndrome

C
Turner's syndrome

D
Edward's syndrome

Solution

A normal female with XX chromosomes has one Barr body. A normal male (XY) has none. Abnormal males with three XXY (Klinefelters' syndrome) have one Barr body.
Question 3
1 / -0

When chromosome sets are present in multiples of 'n', the condition is called

A
monoploidy

B
aneuploidy

C
euploidy

D
diploidy

Solution

Euploidy is the phenomenon in which an entire set of chromosomes is duplicated once or several times. There is an increase in the number of complete sets of chromosomes. It occurs frequently in plants, rarely in animals, and can lead to formation of new species.
Question 4
1 / -0

A cross between yellow round and green wrinkled seed pea plants gave the following four types of progeny in equal proportions: yellow round, yellow wrinkled, green round and green wrinkled. The genotypes of the parents in this case must be

A
YYRR X yyrr

B
YyRr X yyrr

C
YYRR X YYRR

D
YyRr X YYRR

Solution

YyRr X yyrr produces yellow round, yellow wrinkled, green round and green wrinkled progeny.
Question 5
1 / -0

Sex-influenced genes are coded by

A
autosomal genes

B
X-linked genes

C
Y-linked genes

D
epistatic genes

Solution

Sex-influenced traits are controlled by genes present on autosomes. Hence, such genes are present in both the sexes but their expression varies in different sexes.
Question 6
1 / -0

Phenylketonuria is a genetic disorder of

A
trisomic condition

B
monosomic dominant gene

C
autosomal dominant gene

D
autosomal recessive gene

Solution

Phenylketonuria is an autosomal recessive disorder, caused by mutations in both alleles of the gene for phenylalanine hydroxylase (PAH), found on chromosome 12 which breaks phenylalanine into other products.
Question 7
1 / -0

What would a gene be called if it is inherited by both males and females, but expressed differently in the phenotype of a boy and a girl?

A
Unstable

B
Sex-controlled

C
Recessive

D
Structural

Solution

A gene would be called sex controlled if it is inherited by both males and females, but expressed differently in the phenotype of a boy and a girl. The character seems to act as a dominant in one sex and a recessive in the other. An example of such a sex-controlled character is gout in humans; about 80 percent of men inheriting the gene develop gout, but only about 12 percent of women bearing the gene are affected.
Question 8
1 / -0

Drosophila flies with XXY genotype are females, but human beings with such genotype are abnormal males. It shows that

A
Y-chromosome is essential for sex determination in Drosophila

B
Y-chromosome is female determinator in Drosophila

C
Y-chromosome is male determinator in human beings

D
Y-chromosome has no role in sex determination either in Drosophila or in human beings

Solution

In human beings, the presence of a Y-chromosome is required for the development of a male sex phenotype.
Question 9
1 / -0

Assertion (A): In Klinefelter's syndrome, the chromosomal constitution of man is 22AA + XXY.
Reasoning (R): Few men have XX karyotype and yet are males. This is a rare phenomenon due to translocation of a small segment of Y chromosome attached to an X chromosome and is inherited in concert with X. Choose the correct option for the above statements.

A
Both Assertion and Reasoning are true and R is the correct explanation of A.

B
Both Assertion and Reasoning are true and R is not the correct explanation of A.

C
A is true and R is false.

D
Both A and R are false.

Solution

In Klinefelter's syndrome, the chromosomal constitution of man is 22AA + XXY.Few men have XX karyotype and yet are males. This is a rare phenomenon due to translocation of a small segment of Y chromosome attached to an X chromosome and is inherited in concert with X.
In Klinefelter's syndrome, the chromosomal constitution of man is 22AA + XXY.Few men have XX karyotype and yet are males. This is a rare phenomenon due to translocation of a small segment of Y chromosome attached to an X chromosome and is inherited in concert with X.
Question 10
1 / -0

The genotypic ratio in a monohybrid cross is

A
3 : 1

B
9 : 3 : 3 : 1

C
2 : 2 : 1

D
1 : 2 : 1

Solution

The genotypic ratio in a monohybrid cross, when two heterozygotes are crossed, is 1 (homozygous dominant) : 2 (heterozygous) : 1 (homozygous recessive).

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Re-Attempt Weekly Quiz Competition

Principles of Inheritance and Variation Test - 8

Result

Principles of Inheritance and Variation Test - 8

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SHARING IS CARING

Question 1

dominance

segregation

independent assortment

random fertilisation

Solution

Question 2

Klinefelter's syndrome

Down's syndrome

Turner's syndrome

Edward's syndrome

Solution

Question 3

monoploidy

aneuploidy

euploidy

diploidy

Solution

Question 4

YYRR X yyrr

YyRr X yyrr

YYRR X YYRR

YyRr X YYRR

Solution

Question 5

autosomal genes

X-linked genes

Y-linked genes

epistatic genes

Solution

Question 6

trisomic condition

monosomic dominant gene

autosomal dominant gene

autosomal recessive gene

Solution

Question 7

Unstable

Sex-controlled

Recessive

Structural

Solution

Question 8

Y-chromosome is essential for sex determination in Drosophila

Y-chromosome is female determinator in Drosophila

Y-chromosome is male determinator in human beings

Y-chromosome has no role in sex determination either in Drosophila or in human beings

Solution

Question 9

Both Assertion and Reasoning are true and R is the correct explanation of A.

Both Assertion and Reasoning are true and R is not the correct explanation of A.

A is true and R is false.

Both A and R are false.

Solution

Question 10

3 : 1

9 : 3 : 3 : 1

2 : 2 : 1

1 : 2 : 1

Solution

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