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3 years ago

In humans, Rh+ blood is dominant to Rh–. A man and woman are both Rh+, but their first child is Rh–.

Biology

1 answer:

shusha [124]3 years ago

8 0

Answer:

a) There is a 25% chance that their next child will be Rh-.

b) There is a 3/8 chance for a Rh+ girl

Explanation:

As we know from the question that Rh is a dominant gene. A person having only one allele for the gene will show its effect as it is the dominant character.

This means that for a person to lack the Rh factor, it shall not have any allele with the Rh factor.

To illustrate the result, lets draw a punnet square:

Rh+ Rh-

Rh+ Rh+/Rh+ Rh+/Rh-

Rh- Rh+/Rh- Rh-/Rh-

For the probability for it to be a girl, we know that there are 50-50 chances for the next baby to be a boy or a girl. The chance of being Rh+ are 75% for the next baby.

Hence,

3/4 multiplied by 1/2 is 3/8 ,which is the chance for the next baby to be a girl with Rh+ factor.

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