a. Hemophilia is a recessive X-linked human blood disease that leads to the fail

Question

a. Hemophilia is a recessive X-linked human blood disease that leads to the failure of blood to clot normally. What proportion of the sons are expected to have hemophilia if the mother is a carrier and the father has hemophilia? What proportion ofthe daughter are expected to have hemophilia? b. Many animals and plants carry recessive alleles for albinism, a condition in which homozygous recessive individuals completely lack any pigmentation. An albino plant lacks chlorophyll and is white, an albino animal lacks melanin and has white hair (ur. The gene for pigment production is epistatic over genes for hair, skin and eye color. If two parents who are heterozygous for brown hair and heterozygous for the albinism trait have a child, what is the chance the child will have brown hair? What is the chance the child will be an albino

Explanation / Answer

Answer:

XH= normal

Xh= hemophilia

XH Xh (careier female) xXhY (hemophilic male)------------------parents

XhY (hemophilia male)

50% of sons are hemophilic and 50% of daughters are hemophilic.

Xh Y XH XHXh (carrier daughter) XHY (normal male) Xh XhXh (hemophilia female)

XhY (hemophilia male)

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