In hybridization, Tt × tt gives rise to a progeny of ratio:
Correct answer: C. 1 : 1
- A. 2 : 1
- B. 1 : 2 : 1
- C. 1 : 1
- D. 1 : 2
Explanation
The correct progeny ratio for the cross Tt x tt is 1:1. This means that half of the offspring will have the Tt genotype (heterozygous), and half will have the tt genotype (homozygous recessive). This is due to Mendel's principle of segregation, where each parent contributes one allele to the offspring, resulting in equal likelihood of the two possible combinations. Options A (2:1), B (1:2:1), and D (1:2) do not accurately represent the results of this genetic cross.
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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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