Parents who do not have cystic fibrosis (recessive) produce a child who has cystic fibrosis. What...

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Parents who do not have cystic fibrosis (recessive) produce a child who has cystic fibrosis. What...

Parents who do not have cystic fibrosis (recessive) produce a child who has cystic fibrosis. What are the chances that each child born to this couple will have cystic fibrosis?

	100%
	75%
	25%
	0%
	All of the choices are correct.

Could a man with blood type A father a child with blood type B?

	No, only males with type B or AB can have children with type B blood.
	Yes, if his genotype was AO and the mother had type B or AB blood.
	Yes, blood type is the result of the environment.
	No, children will always have the same blood type as their fathers.
	Yes, crossing over recombines all possible blood-group genes during gamete formation

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Answer 1

Answer #1

Since the parents don't have cystic fibrosis however, they produce a child with cystic fibrosis, therefore, the parents are heterozygous for cystic fibrosis gene.

If C and c are dominant and recessive genes respectively, then genotype of parents will be

Cc x Cc

These parents can produce offspring with genotype

CC, Cc, Cc, and cc (four types)

Thus, probability of having child with cystic fibrosis (cc) is 1/4

Therefore, right answer is 25%

Yes, if his genotype was AO and the mother had type B or AB blood

Since, we can get the genotype

BO from AO x BB and AO x AB

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Answer 2

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