A monohybrid cross yielded 3:1 in F2. What could be mode of inheritance?
Correct answer: A. Segregation
- A. Segregation
- B. Independent assortment
- C. Both a and b
- D. None of these
Explanation
The principle of segregation states that each individual has two alleles for each gene, and these alleles segregate during gamete formation, with each gamete receiving only one allele. A 3:1 ratio in the F2 generation of a monohybrid cross suggests that the trait being studied is controlled by a single gene with two alleles and follows a dominant and recessive pattern of inheritance. The dominant allele is expressed in the phenotype of individuals that are homozygous dominant or heterozygous, while the recessive allele is only expressed in individuals that are homozygous recessive. Therefore, the mode of inheritance for the trait being studied is likely to be Mendel's law of segregation.
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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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