COMPUTER GENERATED GRAPHING & TYPED ONLY 1. (one point) A man who has type B blood...

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Biology

COMPUTER GENERATED GRAPHING & TYPED ONLY
1. (one point) A man who has type B blood fathers offspring witha woman who has type A blood. Their first child, a girl, has type Oblood.
a) Diagram this cross and include pedigree information aswell.
b) What proportion of the gametes from the mother have the IAallele?
c) What would be the probability that their SECOND child,assuming they have one, will have type O blood? Diagram this crossas well and include pedigree information if needed to explain yourconclusion.
2. (one point) A man and a woman walk into a genetic counselorâ€™soffice. The manâ€™s brother has recently been diagnosed with Duchennemuscular dystrophy. The woman has no history of the illness in herfamily.
a) They are concerned about having an affected child themselves.The woman is pregnant with a girl. Diagram this cross. What is thechance that the child the woman carries will have the disorder?
b) If they have additional children, would a sperm or egg donorhelp to decrease the chance of an affected child?

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Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Possible genotypesÂ Â Â Â Â

Father type B Blood GroupÂ Â Â Â Â Â Â Â Â Â Â Â BOÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â

Mother type A Blood groupÂ Â Â Â Â Â Â Â Â Â Â AOÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â

	B	O
A	AB	AO
O	BO	OO

b) the mother will produce two gametes: I^A and I^O

Thus, 50% of the gametes will carry I^A

c) 1/4

2. a) Since the man and his brother will carry 1/2 similar genes, the probablity that the man is carrying the gene is 1/2. As Duchenne muscular dystrophy. shows X linked recessive inheritance, the probability that the girld child will have the diseases is 1/4. This is because 1/2 of the X chromosome will be from father and 1/2 from mother. 1/2*1/2 =1/4

b) Yes. A sperm donor would reduce the chances.

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