Heredity and Evolution Test

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Heredity and Evolution Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

Due to Starvation if beetles have low body weight then this character is transfer to the next generation or not it is based on __________.

A
Acquired trait

B
Inherited trait

C
Recessive trait

D
Dominant trait

Solution

The low body weight of the beetles is due to low availability of food which led to starvation. But, this happens in the lifetime of one generation of the beetles and thus, is an acquired trait. This means that the progeny will not have low body weight.
Question 2
1 / -0

In a certain plant, yellow fruit colour (Y) is dominant over green fruit colour (y) and round shape (R) is dominant over oval shape (r). The two genes involved are located on different chromosomes.
Which of the following will result when a plant - YyRr is self-pollinated?

A
9:3:3:1 ratio of phenotypes only

B
9:3:3:1 ratio of genotypes only

C
1:1:1:1 ratio of phenotypes only

D
1:1:1:1 ratio of phenotypes and genotypes

Solution

When two plants with the genotype YyRr are self-pollinated, phenotypes of the resultant offspring will be:
Yellow round - 9
Yellow oval - 3
Green round - 3
Green oval - 1
So, the phenotypic ratio stands out to be 9:3:3:1.
Thus, the correct answer is option A.
Question 3
1 / -0

Choose the correct answer from the alternatives given.

In a monohybrid cross between two heterozygous individuals, the percentage of homozygous individuals obtained in $$F_1$$ generation will be _________.

A
25%

B
50%

C
75%

D
100%

Solution

Considering the trait is tallness, if two heterozygous individuals (Tt, Tt) have F1 generation will have TT, Tt, Tt, and tt as progeny.
Out of these, TT and tt are homozygous and 50%of F1 generation.
The correct option is B.
Question 4
1 / -0

Choose the correct answer from the alternatives given.

In mice, black coat colour (allele B) is dominant to brown coat colour (allele b). The offspring of a cross between a black mouse (BB) and a brown mouse (bb) were allowed to interbreed. What percentage of the progeny would have black coats?

A
25%

B
50%

C
75%

D
100%

Solution

The cross between black mouse (BB) and a brown mouse (bb) and the inbreeding of their hybrid progeny is shown below.
Hence, phenotypic ratio is 3 black: 1 brown i.e. 75% of the progeny would have black coat.
Question 5
1 / -0

Second-generation offspring from a cross are the

A
F$$_1$$ generation

B
F$$_2$$ generation

C
Hybrid generation

D
None of the above

Solution

The second generation of offspring, obtained from an experimental cross of two organisms is called the F$$_2$$ generation.
So, the correct option is 'F$$_2$$ generation'.
Question 6
1 / -0

Choose the correct answer from the alternatives given.

The given Punnetts square represents the pattern of inheritance in a dihybrid cross where yellow (Y) and round (R) seed condition is dominant over white (y) and wrinkled (r) seed condition.

YR Yr yR yr
YR F J N R
Yr G K O S
yR H L P T
yr I M Q U

A plant of type H will produce seeds with the genotype identical to seeds produced by the plants of

A
Type M

B
Type J

C
Type P

D
Type N

Solution

Plant H is formed by fusion of gametes yR and YR and hence has the genotype YyRR. Plant-N is formed by fusion of gametes YR and yR and hence will have the same genotype as plant N i.e., YyRR.
Question 7
1 / -0

Choose the correct answer from the alternatives given.

A recessive allele is expressed in __________________.

A
Heterozygous condition only

B
Homozygous condition only

C
$$F_3$$ generation

D
Both homozygous and heterozygous conditions

Solution

The factor of an allelic or allelomorphic pair which is unable to express its effect in the presence of its contrasting factor in a heterozygote is called recessive factor or allele, e.g., the allele t in hybrid tall pea plant Tt. The effect of recessive factor becomes known only when it is present in the pure or homozygous state, e.g. U in dwarf pea plant.
Question 8
1 / -0

The members of the same biological species are potentially able to

A
compete

B
express all the same genes

C
interbreed

D
None of the above

Solution

Species are groups of actually or potentially interbreeding populations which are reproductively isolated from other such groups. Interbreeding also called as hybrid is the result of combining the qualities of two organisms of different breeds, varieties, species or genera through sexual reproduction.
So the correct option is 'interbreed'.
Question 9
1 / -0

The percentage of ab gamete produced by AaBb parent will be

A
25%

B
50%

C
75%

D
12.5%
Question 10
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 similar to monohybrid cross

D
The alleles of two genes are segregating independently.

Solution

Cross involving two contrasting characters is called a dihybrid cross. The two flowers of each trait assort at random and independent of their traits and get randomly as well as independently rearranged in the offspring producing both parental and new combinations of traits.
So the correct option is "The alleles of two genes are segregating independently.".

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Heredity and Evolution Test - 32

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Heredity and Evolution Test - 32

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SHARING IS CARING

Question 1

Acquired trait

Inherited trait

Recessive trait

Dominant trait

Solution

Question 2

9:3:3:1 ratio of phenotypes only

9:3:3:1 ratio of genotypes only

1:1:1:1 ratio of phenotypes only

1:1:1:1 ratio of phenotypes and genotypes

Solution

Question 3

25%

50%

75%

100%

Solution

Question 4

25%

50%

75%

100%

Solution

Question 5

F$$_1$$ generation

F$$_2$$ generation

Hybrid generation

None of the above

Solution

Question 6

Type M

Type J

Type P

Type N

Solution

Question 7

Heterozygous condition only

Homozygous condition only

$$F_3$$ generation

Both homozygous and heterozygous conditions

Solution

Question 8

compete

express all the same genes

interbreed

None of the above

Solution

Question 9

25%

50%

75%

12.5%

Question 10

The alleles of two genes are interacting with each other

It is a multigenic inheritance

It is similar to monohybrid cross

The alleles of two genes are segregating independently.

Solution

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