Indicate differences between oogenesis and spermatogenesis 1. final number of gametes produced 2. timing of meiosis II 3. timing of onset of prophase I 4. final number of chromosomes in the mature gamete

The correct options indicating the difference s between oogenesis and spermatogenesis are;

1) Final number of gametes produced.

2) Timing of Meosis 2

3) Timing of onset of prophase 1

Oogenesis is process by which a diploid germ cell known as an oogonium which is found in the fetal ovary thereafter becomes a haploid ovum in the adult species after fertilization must have taken place.

During the initial stage of oogenesis,the diploid germ cell moves from the yolk sac to the fetal ovary from there, further mitotic division will occur.

Spermatogenesis on the other hand is simply the process by which haploid spermatozoa get developed from germ cells and finally to sperm production,this occurs in the seminiferous tubules of the testes.

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.