Which process results in the embryo stage of a eukaryotic life cycle?
A. Body features change during molting.
B. Meiosis produces gametes.
C. Body features change during metamorphosis.
D. A zygote divides using mitosis.

The process that results in the embryo stage of a eukaryotic life cycle is a zygote divides using mitosis (option D).

Explanation:

Embryonic development begins after fertilization - when the egg or zygote is formed - and consists of a process of successive mitosis divisions, which lead to segmentation, or formation of the multicellular embryo.

Segmentation results in the formation of structures, such as the blastocyst and gastrula, and subsequently the formation of the three embryonic laminae -ectoderm, mesoderm and endoderm- from which the organs will be formed.

The other processes -molting, meiosis and metamorphosis- occur after birth in various animal species.

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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.