31. The egg colour is inherited by sex chromosome . 32. "We think today's X chromosome retains the gene content " of the non-sex chromosome , Page said. 33. Although it is an XY system, the platypus'sex chromosomes share no homologues with eutherian sex chromosomes. 34. There are other variations of sex chromosomes that lead to a variety of different physical expressions. 35. Although it is an XY system, the platypus'sex chromosomes share no homologues with eutherian sex chromosomes . 36. Another study to be published soon also indicates a problem with ICSI and the sex chromosomes . 37. Turner syndrome certainly is an example of how sex chromosome aneuploidies are milder than autosomal ones. 38. If so, the sex chromosomes of birds and of mammals should share a common chromosomal ancestry. 39. Sex in reptiles is decided not by having different sex chromosomes but, bizarrely enough, by environmental cues. 40. Guppies have 23 pairs of chromosomes, including one pair of sex chromosomes , the same number as humans.
