Which combination of alleles best describes a sex-linked trait?
a. heterozygous alleles
b. homozygous alleles
c. alleles that are carried on x and y chromosomes
d. alleles that are carried on somatic cells

The correct answer would be c. alleles that are carried on X and Y chromosomes.

In humans, genomic content is composed of 22 pairs of autosomal chromosomes and 1 pair of sex chromosomes.

Sex chromosomes are of two types X and Y.

Females are homozygous (XX) and males are hetrozygous (XY).

Mother can pass her X chromosome randomly to son and daughter however, father will always pass his X chromosome to his daughters and Y chromosomes to his sons.

Hence, the alleles or genes located on the X and Y chromosomes are inherited in a sex-linked fashion.

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.