In birds, the male is the homogametic sex. A male bird showing the recessive trait was mated with a female showing the dominant trait of a characteristic governed by a pair of alleles that are sex-linked. What is the probability that the male offspring will show the dominant trait?
Correct answer: E. 1.00
- A. 0
- B. 0.25
- C. 0.50
- D. 0.75
- E. 1.00
Explanation
The cross below shows that all the male offspring are heterozygous and express the dominant phenotype.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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