Principles of Inheritance and Variation Test

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Principles of Inheritance and Variation Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

The hybrid progeny in the first generation is called as

A
F'

B
F2

C
F0

D
F1

Solution

An F1 hybrid (or filial 1 hybrid) is the first filial generation of offspring of distinctly different parental types. F1 hybrids are used in genetics, and in selective breeding, where it may appear as F1 crossbreed.
Question 2
1 / -0

When alleles of two contrasting characters are present together, one of the character express and the other remains hidden. This is the

A
Law of dominance

B
Law of purity of gametes

C
Law of segregation

D
Law of independent assortment

Solution

Mendel's law of dominance states that in a heterozygote, one trait will conceal the presence of another trait for the same characteristic. Rather than both alleles contributing to a phenotype, the dominant allele will be expressed exclusively.
Question 3
1 / -0

The genotypic ratio of a monohybrid cross is

A
1:2:1

B
3:1

C
2:1:1

D
9:3:3:1

Solution

The genotype is the actual genetic makeup of an individual. In monohybrid cross the genotypic ration is 1:2:1 and phenotypic ratio is 3:1.
Question 4
1 / -0

The geometrical device that helps to find out all the possible combinations of male and female gametes is called

A
Punnett square

B
Mendel square

C
Morgan square

D
Bateson square

Solution

Punnett square is used to find out all the possible combination of male and female gametes. In monohybrid cross, a square of four is used and in dihybrid square of 16 is used.
Question 5
1 / -0

Which of the following terms represent a pair of contrasting characters

A
Allelomorphs

B
Co-dominant genes

C
Homozygous

D
Heterozygous

Solution

A pair of contrasting characters of same plant is called allelomophs. Alleles separate from each other during gamete formation and goes to different gametes.
Question 6
1 / -0

The crossing of F1 to any one of the parents is called

A
F1 cross

B
Test cross

C
Recombination

D
Back cross

Solution

The crossing of F1 to any one of the parents is called back cross. It is used to check the purity of individual. When F1 is crossed with recessive parent, it is called test cross.
Question 7
1 / -0

From a single ear of corn, a farmer planted 200 kernels which produced 140 tall & 40 short plants. The genotypes of these off springs are most likely

A
TT, Tt

B
TT, tt

C
Tt, tt

D
TT, Tt, tt

Solution

The genotypes of these off springs are most likely to be TT and tt i.e. 3:1 for tall and dwarf plants. Tall(140): short (40) is near about 3:1 as in monohybrid phenotypic ratio.
Question 8
1 / -0

In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant that is rrtt

A
50% will be tall with red fruit

B
75% will be tall with red fruit

C
25% will be tall with red fruit

D
All the offspring will be tall with red fruit

Solution

If a plant with RRTt genotype is crossed with a plant that is rrtt 50% of the offspring will be tall with red fruit.
Question 9
1 / -0

If two pea plants having red (dominant) coloured flowers with unknown genotypes are crossed, 75% of the flowers are red and 25% are white. The genotypic constitution of the parents having red coloured flowers will be

A
Both morphozygous

B
Both homozygous

C
Both heterozygous

D
One homozygous and other heterozygous

Solution

Pea plants having red (dominant) coloured flower crossed with unknown genotype produces 75% of the flowers are red and 25% are white. This is possible only when the genotype of unknown flower is recessive (tt) similar as monohybrid cross.
Question 10
1 / -0

F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1. It represents in case of

A
Monohybrid cross with complete dominance

B
Co – Dominance

C
Dihybrid Cross

D
Monohybrid cross with incomplete dominance

Solution

Both genotypic and phenotypic ratios are same as 1 : 2 : 1 in monohybrid cross with incomplete dominance. When flower of white and redcolour of snapdragon plants is crossed, in F2 generation, white, pink and red flowers are obtained in 1:2:1.

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Re-Attempt Weekly Quiz Competition

Principles of Inheritance and Variation Test - 5

Result

Principles of Inheritance and Variation Test - 5

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Rank

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SHARING IS CARING

Question 1

F'

F2

F0

F1

Solution

Question 2

Law of dominance

Law of purity of gametes

Law of segregation

Law of independent assortment

Solution

Question 3

1:2:1

3:1

2:1:1

9:3:3:1

Solution

Question 4

Punnett square

Mendel square

Morgan square

Bateson square

Solution

Question 5

Allelomorphs

Co-dominant genes

Homozygous

Heterozygous

Solution

Question 6

F1 cross

Test cross

Recombination

Back cross

Solution

Question 7

TT, Tt

TT, tt

Tt, tt

TT, Tt, tt

Solution

Question 8

50% will be tall with red fruit

75% will be tall with red fruit

25% will be tall with red fruit

All the offspring will be tall with red fruit

Solution

Question 9

Both morphozygous

Both homozygous

Both heterozygous

One homozygous and other heterozygous

Solution

Question 10

Monohybrid cross with complete dominance

Co – Dominance

Dihybrid Cross

Monohybrid cross with incomplete dominance

Solution

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