The phenotypic ratio of the F2 generation of a monohybrid cross is
Correct answer: D. 3:1
- A. 1:1
- B. 9:3:3:1
- C. 1:2:1
- D. 3:1
Explanation
Crossing two heterozygotes gives one homozygous dominant, two heterozygotes and one homozygous recessive, and since the first three all look alike the visible ratio is three to one. 1:2:1 is the genotypic ratio of the very same cross, which is why it is the standard trap. 9:3:3:1 belongs to a dihybrid cross and 1:1 to a test cross.
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About Mendel's Laws of Inheritance
Mendelian inheritance explains how alleles separate into gametes and assort during reproduction, producing predictable genotype and phenotype ratios. Questions cover dominance, recessiveness, homozygous and heterozygous conditions, the laws of segregation and independent assortment, monohybrid and dihybrid crosses, test crosses and the limits caused by linked genes.
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