One of a pair of twins is born a female. Answer the following questions: a. Calc

Question

One of a pair of twins is born a female. Answer the following questions:
a. Calculate the odds of the second twin also being born a female, in the case of
identical twins.
b. Calculate the odds of the second twin also being born a female, in the case of
fraternal twins.
c. Suppose genetic testing prior to birth showed that the twins each had one Y
chromosome, but one is born with female external genitalia and one is born
with male external genitalia. Describe one possible physiological explanation
for this occurrence.

Explanation / Answer

a. The odds of the second twin also being a female is 100% in case of identical twin.

b. The odds of the second twin also being female is 50% in case of fraternal twins.

c. Intersex is a general term used for a variety of conditions in which a person is born with a reproductive or sexual anatomy that doesn't seem to fit the typical definitions of female or male. For example, a person might be born appearing to be female on the outside, but having mostly male-typical anatomy on the inside.

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