BIOA01H3 Lecture Notes - Lecture 32: Turner Syndrome, Nondisjunction, Y Chromosome
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6 Jan 2018
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Almost none of the genes in the x chromosome share regions of homology in the. 1000 genes on x, 50 genes on y. Meiosis in females result in x-bearing eggs only. Meiosis in males result in a 1:1 ratio of x-bearing and y-bearing sperm. Random fertilization results in an expected ratio of 1:1, males:females. Most genes in the x chromosome have no counterparts in the y chromosome. Recessive mutation in an x-linked gene is expressed in males. A male with an x-linked recessive trait will have heterozygous (carrier) daughters and. Crisscross: affected males carrier females affected males normal sons. The descendants from a carrier female have half of the daughters are expected carriers and half the sons are to be affected. If carrier and affected male cross then affected female can occur. Results in each egg containing a single x chromosome.
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