34 A chromosomally male fetus with normally functioning testes has a mutation in

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34 A chromosomally male fetus with normally functioning testes has a mutation in the MIS receptor so that it can't respond to MIS (but it can still respond to testosterone and DHT). Which of the following WILL NOT develop by the time the child is born?

Select one:

a. A uterus

b. Fallopian tubes

c. An epididymis

d. A c litoris

Question 35

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35 What determines whether the Wolffian ducts will develop into the epididymis, vas deferens etc or regress?

Select one:

a. The presence or absence of sry

b. The presence or absence of DHT

c. The presence or absence of T

d. The presence or absence of MIS

36 The concordance rate for non-heterosexuality in identical twins is approximately 30% (i.e. if one twin is non-heterosexual, there is a 30% chance that the other twin is also non-heterosexual), while the concordance rate for fraternal twins is 8%. What does this suggest about the factors affecting the development of sexual orientation?

Select one:

a. Genetic factors alone determine sexual orientation.

b. Genetic factors contribute to determining sexual orientation, but they are not the only contributing factors

c. Social factors alone determine sexual orientation.

Question 37

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37 What have studies of birth order shown with regard to sexual orientation?

Select one:

a. Later born sons are more likely to identify as g ay than first born sons

b. Later born sons are exposed to higher levels of maternal testosterone than first born sons

c. Women who have older brothers are likely exposed to more testosterone during gestation than first born women and are more likely to identify as lesbians than firstborn women

d. Just being raised with younger male siblings, regardless of whether or not they are biologically related, increases the likelihood that first born sons will identify themselves as g ay

Explanation / Answer

34-c,the epidydymis will not develop by the time of child birth.

35-c,the presence or absence of Testosterone decides development of epidydymis and vas deferens from Wolffian duct.

36-b, this suggests that Genetic factors are not the only factors that decide sexual orientation.

37-a, homosexual orientation increases with more no. of older brothers.

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