A monohybrid cross yielded a 3:1 ratio in F2. What could be the mode of inheritance?
Correct answer: A. Segregation
- A. Segregation
- B. Independent assortment
- C. Both Options A and B are correct
- D. None of these options are correct
Explanation
As the ratio is 3:1, it means there are only two traits under observation: the two possibilities for a gene (alleles). We study alleles for one trait in Mendel's first law, also called the law of segregation. It states that during gamete formation, the two alleles for a gene segregate or separate, and each gamete takes only one allele. When two gametes join to form a zygote, the two alleles combine again.
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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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