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SEX-LINKED TRAITS & PEDIGREES

SEX-LINKED TRAITS & PEDIGREES. SEX DETERMINATION. female. XX =. Female karyotype. Xy =. male. Male karyotype. X. X. Who decides ?. X X. X X. X. Mom can give X Dad can give X or y. y. X y. X y. Dads determine sex of babies.

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SEX-LINKED TRAITS & PEDIGREES

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  1. SEX-LINKED TRAITS & PEDIGREES

  2. SEX DETERMINATION female XX = Female karyotype Xy = male Male karyotype

  3. X X Who decides? X X X X X Mom can give X Dad can give X or y y X y X y Dads determine sex of babies. If dad gives X with mom’s X = girl If dad give y with mom’s X = boy

  4. SEX CHROMOSOMES CONTAIN GENES THAT CODE FOR TRAITS = SEX LINKED TRAITS

  5. SEX LINKED TRAITS show up in different % in males and females because they move with the sex chromosomes

  6. Only Males Inherit Y Chromosomes(No Hairy Pinna’s for us women!) Y-LINKED GENES: Genes carried on Y chromosome EX:Hairy pinna of the ear _________genes only show up in _______ Y linked males.

  7. Both Males and Females Inherit X Chromosomes: Males XY; Females XX X-LINKED GENES: Genes carried on the X chromosome Hemophilia EX: _____________ _____________ _________________________ Colorblindness Muscular Dystrophy

  8. Make a cross with an X-linked gene Hemophilia is an ___________ _________ disease X-linked recessive H Use ___ for normal dominant blood clotting gene. Use ___ for recessive hemophilia gene. On X chromosome write it as _____ h Xh

  9. H H CARRIER H h Mother Without hemophilia = X X Without hemophilia = X X With hemophilia = X X Father Without hemophilia = X y With hemophilia = X y h h H h

  10. Make a cross with an X-linked gene Carrier Mom Normal Dad GIRLS _______ = normal _______ = look normal but are CARRIERS BOYS _______ = normal _______ = hemophilia 1/2 XHXH XHy XHXh Xh y 1/2 1/2 1/2 Worksheet 3 question 2

  11. ONLY Y linked genes ________ show up in males. X linked recessive genes appear __________ in males than females. Females can be __________ for X linkedrecessive traits. Males can _________ carriers for X linked recessive genes. They either have trait OR are normal. more often CARRIERS NEVER BE

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