BIOL 330 Lecture Notes - Lecture 13: Labioscrotal Swelling, Fallopian Tube, Bulbourethral Gland

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jadecamel246

14 Sep 2017

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The role of genes in sexual differentiation: all embryos are bipotential as they have the ability to develop either male or female bodies. Sex determination is the process that determines which type of body will develop. Genes govern sex determination in humans and other mammals. A gene on the y chromosome called sry, the sex- determining region of the y chromosome, causes an embryo to develop as male. If an embryo is chromosomally female, xx, sry is generally absent and the embryo will develop as female: the role of sry in male sexual differentiation is to stimulate the development of testes from the primordial gonads. If an embryo is chromosomally xx and sry is absent, then ovaries will develop from the primordial gonads. The only thing sry does during the process of sexual differentiation is to turn off the developmental program that leads to the formation of ovaries from the primordial gonads.

Related Questions

Which of the following CORRECTLY outlines the role ofalternative splicing in the control of sex differentiation inDrosophila?

	Female flies alternatively splice mRNA from the male pronucleusto determine if the zygote will develop as a male or female.
	Alternative splicing allows male flies to produce sperm witheither an X or a Y chromosome, causing sex differentiation.
	Alternative splicing early in embryonic development allowsmales and females to produce distinct products from the same genes,leading to sexually dimorphic flies.
	Alternative splicing can only occur in fully differentiatedcells and therefore cannot contribute to sex differentiation.
	Alternative splicing generates X:A ratio of 0.5 in females andX:A ratio of 1.0 in males, where Tra protein mediated splicing onlytakes place in males.

coralsheep993

12. (Problem 11) Which of the following correctly outlines the role of alternative splicing in the control of sex differentiation in Drosophila?

	A. Alternative splicing early in embryonic development allows males and females to produce distinct products from the same genes, leading to sexually dimorphic flies.
	B. Alternative splicing allows male flies to produce sperm with either an X or a Y chromosome, causing sex differentiation.
	E. Alternative splicing generates X:A ratio of 0.5 in females and X:A ratio of 1.0 in males, where Tra protein mediated splicing only takes place in males.
	D. Alternative splicing can only occur in fully differentiated cells and therefore cannot contribute to sex differentiation.
	C. Female flies alternatively splice mRNA from the male pronucleus to determine if the zygote will develop as a male or female

carminesalmon575

trouble with genetics problem that has several genes, I cant seem to set it up right.

In clown fish there is a gene that controls their preference for red or yellow sea anemones. Interestingly, the preference for red sea anemones is dominant in males but recessive in females. a third allele exists that gives the fish a preference green anemones that is recessive to all other known alleles in either sex.

The gene that controls the color of the clown fish is found on the X chromosome. There is an allele that causes the fish to have a lemon color, which is dominant to a ruby color. Both lemon and ruby are dominant to the white color allele. You notice that regardless for the genetics of preference; if the female fish is lemon she will always prefer the yellow sea anemone. Assume fish follow the sex determination as mammals.

a) What would be the phenotypic outsome of a:

Male cherry fish who prefers red anemones whose dad was homozygous ruby and has preference for green anemones.

Female lemon fish that prefers yellow anemones who has the same father as the male fish.

b) Explain how the genetic illustrated above have a fitness advantage for these fish.

emeraldweasel173

BIOL 330 Lecture Notes - Lecture 13: Labioscrotal Swelling, Fallopian Tube, Bulbourethral Gland

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