Question

select the true statements regarding the roles of sex chromosomes in human development.

Select the true statements regarding the roles of sex chromosomes in human development. The X chromosome does not contain functional genes. An individual missing the SRY region of the Y chromosome will be phenotypically female. XXX females develop normally except for some slight physical abnormalities. XO females are viable, whereas YO males are inviable. Female cells typically contain two active X chromosomes which are both actively transcribed.

Answer 1

Answer=True statements regarding the roles of sex chromosomes in human development are as follows:

An individual missing the SRY region of the Y chromosome will be phenotypically female.

Explanation = The sex of human is determined by its sex chromosomes.Female have two X chromosomes in all their somatic cells, whereas males have one X and one Y chromosome.sex determining region that is SRY located on the short arm of Y chromosome.it is the only gene on the Y chromosome that is necessary and sufficient to initiate testes development.

In females SRY region is absent because female contains two X chromosomes.

XXX female develop normally except for some slight physical physical abnormalities =

Explanation - XXX female also called as triple X females, they have 3 X chromosomes.

they develop normally except some physical abnormalities like as they are taller in appearence.,muscle weakness ,very curved pinky finger.

but they are normal can conceive a child.

XO females are viable whereas YO males are inviable =

Explanation = XO females are viable,they are sterile with short stature,with low mental ability,failure to undergo puberty .that females have turner's syndrome.

YO males are non viable genes on X chromosome required for development and survival.