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Sex Determination in Humans

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Questions and Answers

What is the probability of having a baby girl, according to Mendelian genetics, for a couple who already has three sons?

75%

25%

50% (correct)

10%

In humans, which sex chromosomes are possessed by females and males respectively?

XX in females and XY in males (correct)

XX in females and YY in males

XY in females and YY in males

XY in females and XX in males

Why are X-linked traits and disorders more commonly expressed in males than in females?

Females have more severe symptoms

Males have only one copy of the X chromosome (correct)

Females have more Y chromosomes

Females have two X chromosomes

What is hemophilia characterized by?

Inability of the blood to clot properly Signup and view all the answers

Which chromosome carries more genes, making it more commonly linked to genetic mutations and disorders?

X chromosome Signup and view all the answers

Why does a male manifest a sex-linked disorder if he inherits a certain allele?

Due to not having a second X chromosome to provide a protective dominant allele Signup and view all the answers

Why can females be carriers of a sex-linked disorder without showing symptoms?

Because they possess a second X chromosome with a normal allele Signup and view all the answers

What causes color-blindness, particularly red-green color blindness?

Deficiency in red or green cones in the retina Signup and view all the answers

In terms of inheritance, what genotype represents a normal female carrier of hemophilia?

XHXh Signup and view all the answers

Why do men have a higher chance of being color-blind compared to women?

Inheritance of the Xb allele on the single X chromosome Signup and view all the answers