Self fertilization of F-1 dihybrids, following independent assortment of alleles result in:
Correct answer: D. 3/16 Tall-wrinkled ; 3/16 Dwarf-round
- A. 3/16 Tall-round ; 3/16 dwarf-wrinkled
- B. 9/16 Tall-wrinkled ; 3/16 dwarf-round
- C. 9/16 Tall-round ; 3/17 Dwarf-round
- D. 3/16 Tall-wrinkled ; 3/16 Dwarf-round
Explanation
As we talk about the F1 generation, we can assume them to be heterozygous for both characteristics. We can consider T as the allele coding for Tall, t for dwarf, R for round and r for wrinkled. By drawing a Punnett square, we can find the ratio of the different phenotypes.
This question appeared on the UHS MDCAT 2017 paper, which you can sit online with every answer explained.
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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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