Multiple choice

Which of the following is not true about autosomal dominant traits?

  1. Every affected person should have at least one affected parent.

  2. Males and females should be equally often affected.

  3. An affected person has a 50% chance of transmitting the dominant allele to each offspring.

  4. All the daughters of an affected male will be affected but none of the sons.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

For autosomal dominant traits, every affected individual must have an affected parent (except new mutations), males and females are equally affected, and there's a 50% transmission risk to each offspring. However, both sons AND daughters of an affected male have equal 50% chance - not all daughters and no sons. This sex-specific pattern describes X-linked inheritance, not autosomal dominant.

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