Assume that a trait is expressed according to the mechanism of complete dominance. Each gene contributes one of two possible alleles. Which of the following statements is true?
Correct answer: D. If two heterozygous organisms mate, 75% of the progeny will display the dominant phenotype.
- A. The genotype is the expressed trait of the individual
- B. There are three possible phenotypes the organism can express
- C. If two heterozygous organisms mate, 25% of the progeny will be
- D. If two heterozygous organisms mate, 75% of the progeny will display the dominant phenotype.
Explanation
If two heterozygous organisms mate, the phenotypic ratio of dominant and recessive offspring is 3:1.
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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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