The phenotype for both TT and Tt is tall, so the allele T is known as:
Correct answer: A. Dominant
- A. Dominant
- B. Recessive
- C. Homozygous
- D. Heterozygous
- E. Linked
Explanation
In genetics, a dominant allele is expressed when present in either the homozygous or heterozygous state. The allele that is not expressed in the presence of a dominant allele is called recessive. In this case, the allele T is dominant, as it produces the tall phenotype when present in either homozygous (TT) or heterozygous (Tt) state. The recessive allele, t, is only expressed when present in the homozygous state (tt) and produces a short 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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