(show all your works and measure that you answer all questions for part a to par

Question

(show all your works and measure that you answer all questions for part a to part b below. Sorry for long questions, but I give thanks to anyone who can help me)

Note: Please respond to all questions for part a and part b below. Thank you

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

Haemophilia is X-linked recessive traits. before going into the question we need to clear about two things.

in X-linked traits more males are effected than females because they have only one X-chromosome.

X-linked traits never paseed from father to son.

if Mother was carrier and father has haemophilia.

H - normal and h = heamophilia

the genotype of carrier mother - XHXh

Genotype of effected father - XhY

XHXh × XhY

XHXh

Carrier Female

XHY

normal Male

HhXh

Effected Female

XhY

Effected male

Mother was carrier and father has haemophilia -

1/2 of their sons are effected with heamophilia and other half would be normal.

1/2 of their daughter are effected with Haemophilia and others act as Carriers for the trait.

b.Ans.

Parents Heterozygous for albinism

Aa × Aa

AA

Normal

Brown Hair

Aa

Normal

Brown hair

Aa

Normal

Brown Hair

aa

Albino

3/4 of their children have brown hair.

1/4 of their children are Albino.

Xh Y XH

XHXh

Carrier Female

XHY

normal Male

Xh

HhXh

Effected Female

XhY

Effected male

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