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Questions and Answers
Which statement about autosomal recessive disorders is true?
Which statement about autosomal recessive disorders is true?
- Homozygotes have normal enzyme function.
- Heterozygotes do not produce any defective enzymes.
- Homozygotes lack normal enzyme function and develop the disease. (correct)
- Heterozygotes have double the amount of normal enzyme compared to homozygotes.
In X-linked inheritance, why is there no father-to-son transmission of the trait?
In X-linked inheritance, why is there no father-to-son transmission of the trait?
- Daughters always receive the X chromosome carrying the mutant allele from their father.
- Sons inherit their X chromosome from their father.
- Heterozygous females do not pass on the trait to their sons.
- Affected males do not pass on their Y chromosome to their sons. (correct)
What is a common feature of genetic disorders caused by chromosomal mutations?
What is a common feature of genetic disorders caused by chromosomal mutations?
- Primarily affect enzyme proteins
- Single nucleotide changes
- Changes limited to a single gene
- Changes in chromosome number (correct)
Why do all female offspring of affected males become carriers in X-linked inheritance?
Why do all female offspring of affected males become carriers in X-linked inheritance?
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In autosomal recessive disorders, why do heterozygotes not develop the disease?
In autosomal recessive disorders, why do heterozygotes not develop the disease?
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