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When a gene is found on a sex chromosome, it is said to be sex-linked. Because males and females have different combinations of sex chromosomes, the ratio of inheritance for a sex-linked gene can be different between men and women. In mammals, females are homogametic, which means they have two copies of the same chromosome (the X-chromosome). Males are heterogametic, having only one copy of the X-chromosome. Which of the following scenarios gives both sons and daughters the SAME probability of being born with a disease? A. The disease is X-linked dominant. A heterozygous mother is crossed with a father with the disease. B. The disease is X-linked recessive. A heterozygous mother is crossed with a healthy father. C. The disease is X-linked dominant. A heterozygous mother is crossed with a healthy father. D. The disease is X-linked recessive. A mother with the disease is crossed with a healthy father.
Sagot :
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