Question

1. In carnations, the heterozygous plants have pink flowers, while the two homozygous plants have red flowers or white flowers. When plants with red flowers are crossed with plants with white flowers, what proportion of the offspring will have pink flowers?

- 08%

- 25 %

- 50 %

- 75 %

- 100 %

2. Albinism (lack of skin pigmentation) is caused by a recessive mutation on one of the autosomal chromosomes. A man and woman, both with normally pigmented skin, have an albino child together. For this trait, what is the genotype of the albino child?

3. Albinism (lack of skin pigmentation) is caused by a recessive mutation on one of the autosomal chromosomes. A man and woman, both with normally pigmented skin, have an albino child together. The couple decide to have a second child. What is the probability that this second child will also be albino?

Answer 1

Question 1) Option E, 100%

Here assume R allele red colour

r allele white color flower

Rr heterozygous pink flower

If RR ( red) X rr ( white )

Rr ( pink)

All flowers will be of white color

Question 2) albinism is autosomal recessive disorder

For having a disease both of allele must be mutated

If normal allele is A

Recessive allele a

aa will be albino child

Aa ( father) X Aa ( mother)

	A	a
A	AA	Aa
a	Aa	aa

There will be 25% of the possibility of first child to have disease or albinism

Genotype of albinism child will be aa

Question 3) couple has only one albino child so second child having probability of albino will be o%