1 / 11

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.

milt
Download Presentation

SEX-LINKED TRAITS & PEDIGREES

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related