Multiple Choice
Which of the following is an autosomal dominant disorder?
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13. Mendelian Genetics
Autosomal Inheritance
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Which of the following statements about autosomal recessive traits is true?
A
They are always passed from father to son.
B
They are more commonly expressed in males than females.
C
They can be expressed with just one copy of the recessive allele.
D
They require two copies of the recessive allele to be expressed.
Verified step by step guidance1
Understand that autosomal recessive traits are located on non-sex chromosomes, meaning they are not linked to the X or Y chromosomes.
Recognize that for an autosomal recessive trait to be expressed, an individual must inherit two copies of the recessive allele, one from each parent.
Note that autosomal recessive traits are not more commonly expressed in males than females, as they are not linked to sex chromosomes.
Realize that these traits cannot be expressed with just one copy of the recessive allele; one copy would make the individual a carrier, not expressing the trait.
Conclude that the correct statement is that autosomal recessive traits require two copies of the recessive allele to be expressed.
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