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Download 04. Sex linked Traits
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Sex-Linked Traits The X-chromosome is longer than the Ychromosome. There are certain gene locations (LOCI) that are on the X-chromosome that are not matched on the Ychromosome, so they are expressed since there is no other gene present. Sex-linked traits are controlled by genes located on the sex chromosomes. A recessive trait is more likely to express itself in males than in females since males need only one copy of the recessive alleles while females need two. Premature baldness – Xb XBXB – with normal hair retention XBXb – carrier of premature baldness XbXb – prematurely bald XBY – with normal hair retention XbY – prematurely bald Color Blindness – Xc XCXC – not color blind XCXc – carrier of color blindness XcXc – color blind XCY – not color blind XcY – color blind Hemophilia – Xh XHXH – does not have hemophilia XHXh – carrier of hemophilia XhXh – hemophiliac XHY – does not have hemophilia XhY – hemophiliac A female carrier of hemophilia, with type O blood mates with a male with normally clotting blood and type A (heterozygous) blood). Describe possible offspring. Parents: XHXh OO * XHY AO F1 XHO XhO XHA XHXHAO XHXhAO XHO XHXHOO XHXhOO YA XHYAO XhYAO YO XHYOO XhYOO One female type A, normal clotting One female type A, carrier hemophilia One female type O, normal clotting One female type O, carrier hemophilia One male type A, normal clotting One male type A, hemophilia One male type O, carrier hemophilia One male type O, hemophilia
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