A brown-eyed man marries a blue-eyed woman. They have four children, two with brown eyes, and two with blue eyes. What are the genotypes of all these people?

bb, bb, Bb, Bb

Explanation:

Brown eyes are a domininat (B) gene whilst blue eyes are recessive (b). In order for the children to have blue eyes, both parents must contain the recessive genes for blue eyes. This means that the father had mixed genes (Bb) for blue and brown eyes but due to the dominant brown gene has Brown eyes. The mom has blue eyes meaning that she has the recessive gene pair for blue eyes (bb). When the pair's genes are mixed. Bb+bb. Mendelian gene crossing occurs and the offspring have a 1:2 chance of inheriting either blue or brown eyes due to the gene mixture that resutls and is shown in the answer above.

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.