A cross between a black cat and a tan cat produces a tabby pattern (black and tan fur together). What percent of kittens would have tan fur if a tabby cat is crossed with a black cat?
Correct answer: D. 0%
- A. 100%
- B. 50%
- C. 25%
- D. 0%
Explanation
Tabby cats are hybrids (because they have both colours) & a black cat must be homozygous black. So the cross for this problem is BB (black) x BT (tabby). The results show that 50% of the offspring will be BB (black) & 50% will be tabby (BT). So to answer the question, 0% of the kittens will be tan.
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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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