PLEASE ANSWER BOTH 12 AND 13 COMPLETLY SHOWING ALL WORK 12) Julie has two childr

Question

PLEASE ANSWER BOTH 12 AND 13 COMPLETLY SHOWING ALL WORK

12) Julie has two children. One of them is a boy. (3.0 pts.)

a. What is the probability that both of her children are boys?

b. Julie has one daughter and is now pregnant. What is the probability that Julie’s next child will be a girl?

c. Is there any difference between the problems in (a) and (b)? If so, what is it?

13) In humans, the ability to taste the chemical phenylthiourea (PTU) is dominant.

"Tasters" (TT) or (Tt) perceive an extremely bitter taste, while non-tasters (tt) cannot taste this substance at all. What phenotypes of offspring would be expected from the following crosses? In what ratios would you expect these offspring to occur? (2.0 pts)

A)heterozygote X heterozygote

B)heterozygote X non-taster

c) homozygous taster X heterozygote

Explanation / Answer

12.

a. The probability of both children being a boy is 50%, as she already has one boy, so having another boy is 50%.

b. The probability of julie's next child being girl is 50%

c. The first question gives a scenario where both the children are born and having both boys is 50%, but in the second scenario only one child is known and second child is not born so probability based on the scientific assumption.

13.

a. Tt x Tt

TT (Taster), Tt (Taster), Tt (Taster), tt (Non-taster) 3:1 ratio.

b. Tt x tt

Tt (taster), Tt (taster), tt (non-taster), tt (non-taster) 1:1 ratio.

c. TT x Tt

TT (taster), TT (taster), Tt (taster), Tt (taster) all are taster.

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