D gene is an X-chromosome-linked gene. a) 100% will have the disease, XdY // 0% will be carriers. b) 0% will have the disease // 100% will be carriers, XDXd.
<h3>What are the séx-linked genes?</h3>
These are genes that can be found only in the X-chromosome. The inheritance pattern expressed by these genes varies from the one expressed by genes located in autosomal chromosomes.
In the exposed exampe,
- muscular dystrophy are X-linked recessive disorders
- woman ⇒ carrier for muscular dystrophy ⇒ heter0zyg0us ⇒ XDXd
- man ⇒ doesn’t have muscular dystrophy ⇒ X-chromosome with the dominant allele ⇒ XDY
- XD ⇒ chromosome rarrying the dominant allele
- Xd ⇒ chromosomes carrying the recessive allele
Cross: Man x Woman
Parentals) XDY x XDXd
Gametes) XD Y XD Xd
Punnett square) XD Xd
XD XDXd XDXd
Y XdY XdY
F1) 1/2 = 50% of the progeny will express the normal phenotype, XD-
1/2 = 50% of the progeny will have muscular dystrophy, Xd-
100% of the girls will be normal and carriers, XDXd
100% of the boys have muscular dystrophy, XdY
a. What percentage of their sons will have the disease, and what percentage of their sons will be carriers?
Considering only boys,
- 100% of them will have the disease, XdY
- 0% will be carriers.
b. What percentage of their daughters will have the disease, and what percentage of their daughters will be carriers?
Considering only girls,
- 0% of them will have the disease,
- 100% will be carriers, XDXd
You will elarn more about séx-linked genes at
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