Principles of Inheritance and Variation Test

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Principles of Inheritance and Variation Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

All genes located on the same chromosome:

A
Form different groups depending upon their relative distance

B
Form one linkage group

C
Will not from any linkage groups

D
Form interactive groups that affect the phenotype

Solution

Morgan showed that genes located on the same chromosome formed one linkage group. But linkage or no linkage depends on proximity of two genes. Genes which are closer show more likelihood of linkage.
Question 2
1 / -0

Conditions of a karyotype 2n +1, 2n –1 and 2n + 2, 2n – 2 are called:

A
Aneuploidy

B
Polyploidy

C
Allopolyploidy

D
Monosomy

Solution

Failure of segregation of chromatids during cell division cycle results in gain or loss of chromosome. This condition is called aneuploidy.
Question 3
1 / -0

Distance between the genes and percentage of recombination shows

A
Direct relationship

B
An inverse relationship

C
A parallel relationship

D
No relationship

Solution

Chances of recombination decreases with increased distance between genes. Hence there is an inverse relationship between the two.
Question 4
1 / -0

If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is :

A
Autosomal dominant

B
Autosomal recessive

C
Sex-linked dominant

D
Sex-linked recessive

Solution

In this case, the defective gene is present on the X-chromosome but the disease is manifested in men and women are carriers. So, it is a sex-linked recessive disease. Haemophilia is one example and is also referred to as X-linked recessive disease.
Question 5
1 / -0

In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine?

A
G G G

B
A A G

C
G A A

D
G U G

Solution

The substitution of amino acid in the globin protein results due to the single base substitution at the sixth codon of the beta globin gene from GAG to GUG. Condon GUG codes for valine which results in sickle cell anaemia.
Question 6
1 / -0

Person having genotype \( I^A I^B \) would show the blood group as AB. This is because of:

A
Pleiotropy

B
Co-dominance

C
Segregation

D
Incomplete dominance

Solution

When \(F_1\) generation resembles both parents, this is called co-dominance. This is often seen in ABO blood grouping. Since both A and B sugars are dominant, hence it results in AB blood group.
Question 7
1 / -0

\(ZZ\over ZW\) type of sex determination is seen in:

A
Platypus

B
Snails

C
Cockroach

D
Peacock

Solution

This type of sex determination is seen in birds. The female has a ZW combination while the male has ZZ combination.
Question 8
1 / -0

A cross between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents?

A
TT and Tt

B
Tt and Tt

C
TT and TT

D
Tt and tt

Solution

In case of TT and Tt; all offspring would be tall (TT, Tt). In case of option ‘c’ no gene for dwarf is present, so all offspring will be tall. In case of option ‘d’ one of the parent plant is dwarf, so it is incorrect. In case of option ‘b’ most of the offspring will be tall and a few will be dwarf (TT, Tt, tt).
Question 9
1 / -0

In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that :

A
The alleles of two genes are interacting with each other

B
It is a multigenic inheritance

C
It is a case of multiple allelism

D
The alleles of two genes are segregating independently.

Solution

This shows the perfect dihybrid ratio according to Mendel. Hence, the alleles of two genes are segregating independently.
Question 10
1 / -0

Which of the following will not result in variations among siblings?

A
Independent assortment of genes

B
Crossing over

C
Linkage

D
Mutation

Solution

Linkage happens in all cases whenever two genes are located on the same chromosome and are close to each other. Thus, linkage has nothing to do with variation.

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Principles of Inheritance and Variation Test - 22

Result

Principles of Inheritance and Variation Test - 22

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SHARING IS CARING

Question 1

Form different groups depending upon their relative distance

Form one linkage group

Will not from any linkage groups

Form interactive groups that affect the phenotype

Solution

Question 2

Aneuploidy

Polyploidy

Allopolyploidy

Monosomy

Solution

Question 3

Direct relationship

An inverse relationship

A parallel relationship

No relationship

Solution

Question 4

Autosomal dominant

Autosomal recessive

Sex-linked dominant

Sex-linked recessive

Solution

Question 5

G G G

A A G

G A A

G U G

Solution

Question 6

Pleiotropy

Co-dominance

Segregation

Incomplete dominance

Solution

Question 7

Platypus

Snails

Cockroach

Peacock

Solution

Question 8

TT and Tt

Tt and Tt

TT and TT

Tt and tt

Solution

Question 9

The alleles of two genes are interacting with each other

It is a multigenic inheritance

It is a case of multiple allelism

The alleles of two genes are segregating independently.

Solution

Question 10

Independent assortment of genes

Crossing over

Linkage

Mutation

Solution

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