SEX-LINKED TRAITS (X-LINKED)

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  • Let's sit over here
  • Hi Ariah, i like your yellow shirt
  • Hey Tim, okay sure. Ermm what yellow shirt?
  • Hi, Ariah. I like your yellow shirt.
  • Oh err never mind. If only I was a girl...
  • Hi Ariah, i like your yellow shirt
  • What do you mean?
  • Well, my mum has normal vision but is a carrier of the allele for red-green CVD and my dad has normal vision, I got the CVD allele so that's why your shirt looks yellow to me
  • Hi Ariah, i like your yellow shirt
  • What difference would it make if you were a girl?
  • If I was a girl then i won't have colour vision deficiency because i would get atleast one normal vision allele that will mask the CVD allele and give me normal vision
  • Maybe i should draw it out for you to see.
  • Hi Ariah, i like your yellow shirt
  • How do you know? All i know is that you have a Y chromosome from your father and an X chromosome from your mother.
  • My mum has the genotype XCXc while my dad has XCY. The diagram shows the possible ways their alleles can be combined. My genotype is the one on the bottom right. c is the CVD allele while C is the normal vision allele.
  • Good to know.
  • Oh okay, now i get it. I'm sorry that you have this. Well just so you know my shirt is green.
  • XCXC XCY XCXc XcY
  • Have a great day, Ariah.
  • You too, Tim.
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