Which statement about the pattern of inheritance for a rare dominant allele is true? OA. Unaffected mothers have sons who are affected and daughters who are carriers. B. Every affected person has an affected parent. C. Affected parents do not produce affected children. D. Unaffected fathers have sons who are affected and daughters who are carriers. OE. Unaffected parents can produce children who are affected.
Which statement about the pattern of inheritance for a rare dominant allele is true? OA. Unaffected mothers have sons who are affected and daughters who are carriers. B. Every affected person has an affected parent. C. Affected parents do not produce affected children. D. Unaffected fathers have sons who are affected and daughters who are carriers. OE. Unaffected parents can produce children who are affected.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Transcribed Image Text:**Question:**
Which statement about the pattern of inheritance for a rare dominant allele is true?
**Options:**
- A. Unaffected mothers have sons who are affected and daughters who are carriers.
- B. Every affected person has an affected parent.
- C. Affected parents do not produce affected children.
- D. Unaffected fathers have sons who are affected and daughters who are carriers.
- E. Unaffected parents can produce children who are affected.
**Explanation:**
For a rare dominant allele, the characteristic pattern is that at least one parent must be affected for the trait to be present in the offspring. This means that every affected person typically has an affected parent. The correct answer is usually **B. Every affected person has an affected parent.** Unaffected parents generally cannot produce affected children when dealing with a truly dominant allele.
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