Tt mates with tt. What will be characteristic of offspring?
Correct answer: B. 50% recessive
- A. 75% recessive
- B. 50% recessive
- C. 25% recessive
- D. All dominant
Explanation
The correct option is b) 50% recessive. When Tt (heterozygous) mates with tt (homozygous recessive), the possible genotypes of the offspring are Tt and tt. The dominant allele (T) will be expressed in individuals with either the Tt or TT genotype, while the recessive allele (t) will only be expressed in individuals with the tt genotype.
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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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