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.

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.

i got you i did it ya know what it is just needing to fill this in for a quick task!