Gametes are formed through meiosis (reduction division), in which a germ cell undergoes two fissions, resulting in the production of four gametes. … Gametes of animals, some algae and fungi, and all higher plants exhibit an advanced form of heterogamy called oogamy.
What produces the gamete?
Gametes are haploid cells, and each cell carries only one copy of each chromosome. These reproductive cells are produced through a type of cell division called meiosis. … These cells develop into sperm or ova. The ova mature in the ovaries of females, and the sperm develop in the testes of males.
Does spermatogenesis produce more gametes?
In the male, the production of mature sperm cells, or spermatogenesis, results in four haploid gametes, whereas, in the female, the production of a mature egg cell, oogenesis, results in just one mature gamete. Analogies in the process of maturation of the ovum and the development of the spermatids.
Do gametes determine gender?
Sperm cells carry either an X or Y sex chromosome. Female gametes, or eggs, however, contain only the X sex chromosome and are homogametic. The sperm cell determines the sex of an individual in this case. If a sperm cell containing an X chromosome fertilizes an egg, the resulting zygote will be XX, or female.
Can humans produce both gametes?
Women don’t produce sperm because they do not have the Y chromosome, which possess a gene that tells the body to produce male features. Humans, like all mammals, have two separate sexes. … If animals have the necessary genes to produce either of the gametes, they could produce both.
Are gametes always produced by meiosis?
Gametes are produced by mitosis (not meiosis) and after fertilization a diploid zygote is created. The single zygote cell never grows or divides my mitosis. It can only divide by meiosis to produce haploid cells once more, which then produce the main adult body.
What are some examples of gametes?
In short a gamete is an egg cell (female gamete) or a sperm (male gamete). In animals, ova mature in the ovaries of females and sperm develop in the testes of males. During fertilization, a spermatozoon and ovum unite to form a new diploid organism.
Why is only one egg produced in meiosis?
The one egg cell that results from meiosis contains most of the cytoplasm, nutrients, and organelles. … The unequal distribution of the cytoplasm during oogenesis is necessary as the zygote that results from fertilization receives all of its cytoplasm from the egg. So the egg needs to have as much cytoplasm as possible.
Why is the female gamete bigger than a male?
The male produces relatively smaller gamete called the ‘sperms’, while the female produces relatively larger gametes called the ‘ovum’, thereby exhibiting anisogamy (where there is a fusion of two dissimilar gametes). This takes place so as to increase the chances of male gamete meeting the female gamete.