How do indifferent gonads differ from ovaries?
The mesonephric tubules have inductive influences on the primordial gonads (germ cells) to drive the development of the indifferent gonad into testis. If the mesonephric tubules recede, the gonads will not differentiate and the indifferent gonads will remain as an ovary.
What does it mean for the gonads to be Bipotential?
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.
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. Characteristics of either male or female genitalia can often be recognized by week twelve of development.
What are the types of gonads?
The gonads, the primary reproductive organs, are the testes in the male and the ovaries in the female.
How do gonads differentiate?
The type of gonads that develop, gonadal sex, is determined by the sex chromosome complex (XX or XY). Sex differentiation is a complex process that involves many genes, including autosomal ones. The key to sexual dimorphism is the Y chromosome.
What is meant by indifferent stage?
An indifferent stage of genital development occurs where primordia of the organs of both sexes co‐exist. Two defined antagonistic pathways exist for sexual differentiation. The presence of the SRY gene on the Y chromosome promotes the development of male genital organs.
What gene turns Bipotential gonads into testes?
The Sry gene is expressed in the somatic cells of the bipotential mouse gonad immediately before or during its differentiating into a testis; its expression then disappears (Hacker et al. 1995). The most impressive evidence for Sry being the gene for testis-determining factor comes from transgenic mice.
What causes the undifferentiated or indifferent gonads to become the testes?
The factor that controls their development appears to be a single gene on the Y chromosome called SRY. This gene produces and enzyme called testis-determining factor, which causes the undifferentiated gonads to become testes.
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.
What hormones are associated with gonads?
Gonadal hormones – nearly always synonymous with gonadal steroids – are hormones produced by the gonads, and include both steroid and peptide hormones. The major steroid hormones include estradiol and progesterone from the ovaries, and testosterone from the testes.
What is the main function of gonads?
The two major functions of the gonads in the adult are steroid hormone production and gametogenesis. Reproductive hormones are also pivotal in sexual differentiation, fetal development, growth and sexual maturation.
What is the function of gonads?
Which is the best definition of indifferent gonad?
Define indifferent gonad. indifferent gonad synonyms, indifferent gonad pronunciation, indifferent gonad translation, English dictionary definition of indifferent gonad. n. An organ in animals that produces gametes, especially a testis or ovary. go·nad′al , go·nad′ic adj. American Heritage® Dictionary of the English…
Is the gonad a male or female sex gland?
gonad a sex gland; a gamete-producing gland; the ovary in the female and the testis in the male. The ovary produces the ovum and the testis produces the spermatozoon.
What kind of gametes are the gonads made of?
The gonad is the organ that makes gametes. Gametes are haploid germ cells. For example, sperm and egg cells are gametes. In males, the gonads, known as the testes, secrete the class of hormones called androgens. The predominant androgen in males is testosterone. In females, the gonads, known as the ovaries, secrete estrogen and progesterone.
What kind of hormones are secreted by the gonads?
In males, the gonads, known as the testes, secrete the class of hormones called androgens. The predominant androgen in males is testosterone. In females, the gonads, known as the ovaries, secrete estrogen and progesterone.
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