Question

15. What will be the phenotypic sex of a human with the following gene or chromosomes or both? a. XY with the SRY gene deleted + b. XY with the SRY gene located on an autosomal chromosome c. XX with a copy of SRY gene on an autosomal chromosome M d. XO with a copy of SRY gene on an autosome M e. XXY with the SRY gene deleted F f. XXYY with one copy of the SRY gene delete M 16. In some mites, males pass genes to their grandsons, but they never pass genes to male offspring. Explain.

Answer 1

15. a. XY with the SRY deleted - Female ( as the SRY gene or sex determining region Y protein Gene is deleted and its the gene that works as a transcription factor and causes the expression of male specific genes in the Y chromosome).

b. XY with the SRY gene located on an autosomal chromosome - Male. (the SRY gene here although present in an autosomal chromosome can still be produced as a transcription factor and help producing the male specific genes.

c. XX With a copy of SRY on the autosome- Male ( although the Y chromosome is absent expression of SRY from an autosome will resut in the formationof male gonads)

d.XO with SRY gene on the autosome - Male ( Same as above).

e. XXY with SRY deleted - Female ( because although there is a Y chromosome, the male specific genes wont be expressed because of the absence of the SRY gene and the individual will develop as a female).

f. XXYY with one copy of SRY mutated - Male ( although one copy of SRY is mutated it can still be made from the other copy of Y chromosome making the expression of male specific genes possible.