In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:
Correct answer: A. The two genes are linked and present on the same chromosome
- A. The two genes are linked and present on the same chromosome
- B. Both of the characters are controlled by more than one gene
- C. The two genes are located on two different chromosomes
- D. Chromosomes failed to separate during meiosis
Explanation
Excess parental types vs recombinants indicates linkage; linked genes on the same chromosome are inherited together more often than they recombine.
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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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