8. What chromosomes differs in men and women? Which chromosome is bigger, the X

Question

8. What chromosomes differs in men and women? Which chromosome is bigger, the X or the Y? Which chromosome determine the male traits presentation? What the biological sex of the persons with sex chromosomes XXY, XYY, XXX or XO?

9. For the XO sex determination system, is XO or XX individual female? Any example organism? For the ZW sex determination system, is ZZ or ZW individual female? Any example? Are male honeybees haploid or diploid?

10. For those X-linked dominant alleles/traits (for example the XR for red-eye in Drosophila), what genotype(s) of males can show the dominant traits? what genotype(s) of females can show the dominant traits? How the location of such genes on X affects the differential phenotypes between male and female offspring from heterozygous females crossed to a dominant male?

11. For those X-linked recessive alleles/traits in humans, why the transmission is always from female carrier to patient son or carrier daughter, but father to son transmission is not observed?

12. What is the inheritance pattern for genes in human Y chromosome? Is it likely from mother to son?

Explanation / Answer

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ANSWER 8.
The 23rd chromosome, that is, the sex chromosome diifers in men and women. While both genders have 1 X chromosome, males have one Y chromosome, while males have 1 more X chromosome.

The X chromosome is much bigger than the Y chromosome.

The Y chromosome determines the male traits presentation.

XXY = Male
XYY = Male
XXX = Female
XO = Female

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