Which of the following is NOT correct about sex influenced traits? They have dif
ID: 259179 • Letter: W
Question
Which of the following is NOT correct about sex influenced traits?
They have different patterns of inheritance in males and females
They can be seen in both sexes.
Males and females with the same phenotypes definitely have the same genotypes.
Regardless of the sex of the parent, alleles of these traits can be equally transmitted to sons and daughters
Their phenotypic expression depends on the sex hormones
Mary is not bald. Mary's mother and Mary's husband, John, are bald. Mary is pregnant with a boy/girl dizygotic twin. If John is homozygous for male's pattern baldness, what is the probability that the twins would develop male pattern baldness in adult life?
The boy: 100%; the girl: zero
The boy: 50%; the girl: zero
50% for both
The boy: 75%; the girl: 25%
The boy: 100%; the girl: 50%
100% for both
A.They have different patterns of inheritance in males and females
B.They can be seen in both sexes.
C.Males and females with the same phenotypes definitely have the same genotypes.
D.Regardless of the sex of the parent, alleles of these traits can be equally transmitted to sons and daughters
E.Their phenotypic expression depends on the sex hormones
Explanation / Answer
Answere 1 :
The option (c) is not correct i.e. Males and females with the same phenotypes definatelly have the same genotype because Baldness(a case od sex influences trait) can express in homozygous as well as heterozygous recessive conditions in male i.e. Bb, bb but cannot express in heterozygous condition in female i.e. Bb.
Answere 2 :
The option (d) is correct i.e. The boy 75%; the girl 25%
Because baldeness is a recessive autosomal sex influenced trait. It express only in homozygous recessive condition in females wheres express in both heterozygous as well as homozygous recessive condition in males.
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