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?
•
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.

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.