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Dihybrid crosses Transitional Reasoning Practice

Biology · Heredity · Biology · Mendelian Genetics

1 Biology practice questions on Dihybrid crosses. Questions that build towards applied reasoning.

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Questions

  1. 1.

    In tomato plants, stem height is controlled by a gene where tall (T) is dominant to dwarf (t), and fruit texture is controlled by an independently assorting gene where smooth skin (P) is dominant to peach skin (p). A plant heterozygous for both traits (TtPp) is crossed with a parent of unknown genotype, yielding 152 tall smooth, 149 dwarf smooth, 51 tall peach, and 48 dwarf peach offspring. Based on these phenotypic counts, what is the genotype of the unknown parent plant?

    • A) Ttpp
    • B) ttPp
    • C) TtPp
    • D) ttpp

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