Brown eyes are dominant over blue eyes. If two brown eyed parents have a child with blue eyes, what does it mean about
parent's genotype?
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A. They must both be homozygous dominant.
•
B. One must be heterozygous.
• °C. They must both be heterozygous.
•
D. One must be homozygous recessive.

°C. They must both be heterozygous.

Explanation: For a brown eyes parents to give birth to a blue eyes offspring it means the both parents are heterozygous.

Since D is for dominant allele and

d is for recessive allele

DD is for Homozygous individual (i.e) dominant gene

Dd is for heterozygous individual

dd is for homozygous recessive individual

Dd ×Dd- parents

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DD Dd Dd dd - offsrings 1:2:1

DD- 1 brown eye homozygous offspring

Dd- 2 brown eye heterozygous offspring

dd- 1 blue eye homozygous individual

A cross between two heterozygous individual will lead to segregation of genes in the ratio 1:2:1 i.e 3 brown and 1 blue eye individual.

surface mining destroys mountain tops, landscapes, forests and wildlife habitats. on top of that, it leads to soil erosion and destruction of agricultural land. the landscape changes can also disrupt river channels and streams, which leads to flooding. which, can destroy plant life and other animals as well.

explanation: