BSC 1010C Lecture Notes - Lecture 4: Walther Flemming, Oscar Hertwig, Y Chromosome
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Colorblind: hemophilia, absence of blood clotting factors, duchenne muscular dystrophy, progressive weakening of the muscles, ra(cid:396)el(cid:455) li(cid:448)e past (cid:1006)(cid:1004)"s. In mammalian females, one of the two x chromosomes in each cell is randomly inactivated during embryonic development: the inactive x condenses into a barr body. If a female is heterozygous for a particular gene located on the x chromosome, she will be a mosaic for that character. Is there such thing as a male tortoiseshell: male tortoiseshell can exist if he is kleinfelter syndrome and heterozygous (x^b x^b y) Chromosomal abnormalities: large-scale chromosomal alterations in humans and other mammals often lead to spontaneous abortions (miscarriages) or cause a variety of developmental disorders. Ja(cid:272)o(cid:271)"s s(cid:455)(cid:374)d(cid:396)o(cid:373)e (cid:894)xyy(cid:895: syndromes, klinefelter (xxy, metafemale (xxx, turners syndrome (xo, jacobs (xyy, downs syndrome (21, patau syndrome (13, edwards syndrome (18, xxy egg or sperm, 1/2000 klinefelters.
