Odd little creatures, minions can have different numbers of fingers. Assume that
ID: 58562 • Letter: O
Question
Odd little creatures, minions can have different numbers of fingers. Assume that three fingers (XF) is dominant and sex linked and that 4 fingers are the recessive counterpart. You cross male and female minions who both have three fingers. They have 16 children. All of the girls have three fingers while half of the boys have three fingers and half of the boys have four fingers.
a. what is the genotype of the mother?
b. Assuming that 8 children are girls, how many of them would you expect to be carriers for the 4 finger trait?
c. Suppose you cross of the carrier girl minions with a 4 fingered male. They have a son, what is the likelihood it will have 4 fingers?
d. The minion couple in part c decides to have a second child, what is the chance it will be a 4 fingered girl?
Explanation / Answer
According to the given information, the three fingers are dominant over four fingers and is a X-linked trait. Hence, the females have pair of alleles, while males contain only single allele to encode the character. In case of females, as the character is dominant it can be expressed either in homozygous (XFXF) or heterozygous (XFXf) state. In males, the type of allele present in X-chromosome decides the character where XF males will contain 3 fingers and Xf males contain four fingers. This is because of the presence of single X-chromosome in males.
a. In the given condition the genotype of the mother is heterozygous (XF Xf).
b. If there are 8 girl children, the number of carriers would be 4 among them.
c. The male child always acquires X-linked from mother. Hence, half of the progeny have three fingers, while remaining will have four fingers. This is because males have only one X-chromosome.
d. If a carrier girl is crossed to 4 fingered male, then there are 50 % chances to get a child with fourfingers.
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