- How is human gender determined?
- What are undifferentiated gonads?
- What causes the primitive gonads to develop?
- Are the genetic components that determine whether a mammal develops as a male or female?
- What is the origin of gonads?
- What causes the undifferentiated gonads to develop into female reproductive organs?
- What hormone decides male or female?
- What typically happens to the Müllerian ducts in females during development quizlet?
- How are gonads produced?
- Which of the following is the defining factor for whether a mammal develops female or male external genitals?
How is human gender determined?
In humans, sex is determined by sex chromosomes (XX females, XY males). The X and Y chromosomes harbor dramatically different numbers and sets of genes (about 1,000 genes on the X and only a few dozen genes on the Y), yet they originated from ordinary autosomes during the early evolution of mammals (Figure 1).
What are undifferentiated gonads?
Undifferentiated gonads of XX or XY individuals are apparently identical and can form either ovaries or testes. This period is therefore called indifferent or bipotential stage of gonadal development.
What causes the primitive gonads to develop?
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.
Are the genetic components that determine whether a mammal develops as a male or female?
The SRY gene (blue band) on the male Y chromosome regulates sex determination in mammals. In placental mammals, the presence of a Y chromosome determines sex. Normally, cells from females contain two X chromosomes, and cells from males contain an X and a Y chromosome.
What is the origin of gonads?
The gonads are derived from intermediate mesoderm. In humans, at 4 to 6 weeks of gestation, the urogenital ridges develop as paired outgrowths of coelomic epithelium (mesothelium). The gonads, adrenal cortex, kidney, and reproductive tract derive from the urogenital ridge (Figure 5-1).
What causes the undifferentiated gonads to develop into female reproductive organs?
There is a gene located on the short arm (top half) of the Y chromosome, called "SRY," which, if present, will cause the undifferentiated gonad to become testes around the sixth week of fetal life. At the same time, shrinkage of what would have been the female reproductive tract occurs.
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What hormone decides male or female?
In mammals, testosterone is the primary signal, and the function of the genetic sex of the animal is to determine the sex of the gonad. When the genetic sex is male, testes develop and testosterone is secreted.
What typically happens to the Müllerian ducts in females during development quizlet?
In females the mullerian ducts develop into internal genitalia such as oviducts, uterus, and upper vagina. External genitalia develops normally as female unless exposed to male hormonesmale hormonesTestosterone (T) is a medication and naturally occurring steroid hormone. It is used to treat male hypogonadism, gender dysphoria, and certain types of breast cancer. It may also be used to increase athletic ability in the form of doping.https://en.wikipedia.org › wiki › Testosterone_(medication)Testosterone (medication) - Wikipedia during sensitive developmental period, in which case clitoris and other outer genitalia becomes partially masculinized.
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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.
Which of the following is the defining factor for whether a mammal develops female or male external genitals?
What determines whether a mammal develops male or female external genitals? Genetic males with testicular feminization (androgen insensitivity) develop looking and acting female.