Question

Question 25 Not yet answered Points out of 2.50 Klinefelter syndrome XXY is the set of symptoms that result from two or more X chromosomes in males. The primary features are infertility and small poorly functioning testicles. However, very often, symptoms may be subtle and many people do not realize they are affected. Which of the following statements might explain why symptoms are subtle in many Flag question cases? Select one: a. In males, the important sex chromosome is the Y, so having an extra X is not that important b. Genes on the autosomes compensate for the extra X chromosome by reducing their expression accordingly c. Having an extra X chromosome is lethal for the cell, so the cells that have it die O d. X-inactivation inactivates one of the two X chromosomes present and therefore most of the time there is appropriate expression levels of the genes on the X chromosome e. The X chromosome is small and usually condensed, with very few genes, so having an extra copy is not a big issue

Answer 1

Answer:

25). D. X-inactivation inactivates one of the two X chromosomes present and therefore most of the time there is appropriate expression levels of the genes on the X chromosome

26). E). 1 long and pointy : 1 long and round : 1 short and pointy : 1 short and round

Explanation: When distance between two genes is more thant 50 map units, the two genes assort independently and hence the testcross progeny of the Dihybrid cross would be 1:1:1:1 ratio.