In a family of four children, all four children have blond hair and blue eyes. which statement best explains why all four children have blue eyes?
a.
all four children are the same gender.
b.
all four children have genes for blue eyes.
c.
all four children have the same type of diet.
d.
all four children are the same height.

The correct answer is option B, All four children have genes for blue eyes.

Explanation:

The allele (representative of any trait) carried by genes expresses themselves at specific locus devise a phenotype. Traits exhibited can be represented by genotype and phenotype of an individual.  

Here in this example, blue colour of eyes is a trait which is common in all the children of the family, this simply signifies that genes carrying the alleles is same in all the children.  

multiplying and dividing the two decimals and the eqations by the same number of the overalls

an individual’s sex (i.e., whether they are a male or female) is determined by the sex chromosomes. most people have two sex chromosomes, one that is inherited from their mother and one that is inherited from their father. typically, females have two x chromosomes (xx) and males have one x chromosome and one y chromosome (xy). conditions caused by changes (“mutations”) in genes located on the x chromosome are considered x-linked.

x-linked recessive inheritance

most x-linked conditions are recessive. this means that in a person with two x chromosomes (most females), both copies of a gene (i.e., one on each x chromosome) must have a change or mutation whereas in a person with one x chromosome (most males), only one copy of a gene must have a mutation. a female with a mutation in one copy of a gene on the x chromosome is said to be a “carrier” for an x-linked condition. a male with a mutation in a gene on the x chromosome is typically affected with the condition. because females have two copies of the x chromosome and males have only one x chromosome, x-linked recessive diseases are more common among males than females. however, x-linked recessive diseases can occur in both males and females.

for x-linked recessive disorders, an unaffected carrier mother who has a mutation in a gene on the x chromosome can transmit either the x chromosome with this mutation or a “normal” x chromosome to her children. if the father is unaffected, none of her daughters will be affected and all of her daughters will be unaffected—since they will inherit at least one normal x chromosome from their father. however, each daughter will have a 50% chance of being an unaffected carrier like her mother and a 50% chance of both x chromosomes being normal.