The development of scurs, small horn-like growths on the faces of cattle, is inherited with the sex-influenced alleles ScP๐๐๐andย ScA๐๐๐ด. The allele ScP๐๐๐stands for scurs being present and is dominant in males and recessive in females. The allele ScA๐๐๐ดstands for scurs being absent and is dominant in females and recessive in males. Suppose a male with scurs is mated to a female with no scurs. All of the male offspring, as well as 50% of the female offspring, have scurs. What are the genotypes of the parents in this cross?Multiple choice question.ScPScP๐๐๐๐๐๐ male xย ScAScA๐๐๐ด๐๐๐ดScPScP๐๐๐๐๐๐ male xย ScPScA๐๐๐๐๐๐ด femaleScPScA๐๐๐๐๐๐ด male xย ScPScA๐๐๐๐๐๐ด femaleScPScA๐๐๐๐๐๐ด male xย ScAScA๐๐๐ด๐๐๐ด female
Question
The development of scurs, small horn-like growths on the faces of cattle, is inherited with the sex-influenced alleles ScP๐๐๐andย ScA๐๐๐ด. The allele ScP๐๐๐stands for scurs being present and is dominant in males and recessive in females. The allele ScA๐๐๐ดstands for scurs being absent and is dominant in females and recessive in males. Suppose a male with scurs is mated to a female with no scurs. All of the male offspring, as well as 50% of the female offspring, have scurs. What are the genotypes of the parents in this cross?Multiple choice question.ScPScP๐๐๐๐๐๐ male xย ScAScA๐๐๐ด๐๐๐ดScPScP๐๐๐๐๐๐ male xย ScPScA๐๐๐๐๐๐ด femaleScPScA๐๐๐๐๐๐ด male xย ScPScA๐๐๐๐๐๐ด femaleScPScA๐๐๐๐๐๐ด male xย ScAScA๐๐๐ด๐๐๐ด female
Solution
The correct answer is ScPScA๐๐๐๐๐๐ด male x ScAScA๐๐๐ด๐๐๐ด female.
Here's why:
The male parent has scurs, which means he must have at least one ScP allele. Since all male offspring have scurs, the male parent must be heterozygous (ScPScA), because if he was homozygous (ScPScP), then all the offspring (both male and female) would have scurs.
The female parent does not have scurs, which means she must have at least one ScA allele. Since 50% of the female offspring have scurs, the female parent must be homozygous (ScAScA). If she was heterozygous (ScPScA), then all the female offspring would have scurs.
Therefore, the genotypes of the parents in this cross are ScPScA๐๐๐๐๐๐ด male x ScAScA๐๐๐ด๐๐๐ด female.
Similar Questions
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