
Concept explainers
a.
To determine: Whether males inherit their X chromosome from their mother or from their father.
Introduction: Each somatic cell in humans consists of 46 chromosomes (23 pairs). These include 22 pairs of autosomes and a pair of sex chromosomes (X and Y). Human male have one X and one Y as sex chromosomes while female has two X chromosomes.
b.
To determine: Whether a female has disorder if she has one copy of an X-linked recessive allele for a genetic disorder.
Introduction: Each somatic cell in humans consists of 46 chromosomes (23 pairs). These include 22 pairs of autosomes and a pair of sex chromosomes (X and Y). Human male have one X and one Y as sex chromosomes while female has two X chromosomes.
c.
To determine: Whether a male has disorder if he has one copy of an X-linked recessive allele for a genetic disorder.
Introduction: Each somatic cell in humans consists of 46 chromosomes (23 pairs). These include 22 pairs of autosomes and a pair of sex chromosomes (X and Y). Human male have one X and one Y as sex chromosomes while female has two X chromosomes.
d.
To determine: The number of gametes a female can produce if she is a carrier of an X-linked recessive disorder.
Introduction: Each somatic cell in humans consists of 46 chromosomes (23 pairs). These include 22 pairs of autosomes and a pair of sex chromosomes (X and Y). Human male have one X and one Y as sex chromosomes while female has two X chromosomes.
e.
To determine: Whether the sons and daughters of a male with X-linked recessive disorder and a normal female have genetic disorder, and whether their children be carriers for the disorder.
Introduction: Each somatic cell in humans consists of 46 chromosomes (23 pairs). These include 22 pairs of autosomes and a pair of sex chromosomes (X and Y). Human male have one X and one Y as sex chromosomes while female has two X chromosomes.

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