What is the indifferent stage of embryonic development?

Although genetic sex (XX or XY) is determined at fertilization, the embryo�s gender is not distinguishable for the first six weeks of development; this is known as the indifferent period of development.

What are indifferent gonads?

Indifferent gonad: A gonad in an embryo that has not differentiated into a definitive testis or ovary. An indifferent gonad becomes a testis if the embryo has a Y chromosome, but if the embryo has no Y chromosome, the indifferent gonad becomes an ovary.

How does the indifferent gonad form?

Primitive gonads are formed by the proliferation of germ cells, which migrate from the yolk sac and undergo condensation of the underlying mesenchyme in the sixth week. The gonads do not acquire male or female morphological characteristics until the seventh week of development, so they are classified as indifferent.

What are the different stages of gonads?

Six stages of gonad maturation were established for the females and males namely, immature (I), maturing (II), mature (III), ripe and running (IV), spent (V) and resting (VI).

What is the indifferent stage of embryonic development quizlet?

The indifferent embryo: The indifferent embryo begins phenotypic sexual differentiation during week 7 of development; by week 12 female or male characteristics of the external genitalia can be recognized; by about week 20 phenotypic differentiation is complete.

How do gonads develop before birth?

The gonads initially develop from the mesothelial layer of the peritoneum. The ovary is differentiated into a central part, the medulla, covered by a surface layer, the germinal epithelium. The immature ova originate from cells from the dorsal endoderm of the yolk sac.

What are Bipotential gonads?

A bipotential gonad is defined as an undifferentiated phase of gonadal development where the male (XY) and female (XX) undifferentiated gonads appear identical and they can either develop into testes or ovaries.

How does gonads develop before birth?

What develops into gonads?

The gonads develop from three sources: the mesothelium (coelomic epithelium) lining the posterior abdominal wall, the underlying mesenchyme (intermediate mesoderm), and the primordial germ cells. The mesothelium proliferates to form the genital ridge, a bulge of tissue medial to the mesonephros.

What is gonadal maturation?

Maturation of the fish gonad is a process where tiny incipient sex cells develop, together with accessory tissue, into large organs with mature sperm or eggs that can be spawned. Maturation may occur once in a fish’s life or many times a year, depending on species and conditions.

What do gonads develop into?

The development of the gonads is part of the prenatal development of the reproductive system and ultimately forms the testes in males and the ovaries in females. The gonads initially develop from the mesothelial layer of the peritoneum.

How are gonads produced?

The gonads are controlled by luteinizing hormone and follicle-stimulating hormone, produced and secreted by gonadotropes or gonadotrophins in the anterior pituitary gland. This secretion is regulated by gonadotropin-releasing hormone produced in the hypothalamus.

What contributes to an indifferent gonad?

What is Gondalsex?

chromosomal sex the sex as determined by the presence of the XX (female) or the XY (male) genotype in somatic cells, without regard to phenotypic manifestations. Called also genetic sex.

How are gonads developed?