Form 12: Predicting Phenotypic Ratios & Percentages Exercise

Form 12: Predicting Phenotypic Ratios & Percentages

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Form 12: Predicting Phenotypic Ratios & Percentages

In this engaging exercise, students will explore the principles of Mendelian genetics by predicting phenotypic ratios and percentages in various genetic crosses, using Punnett squares and real-world examples to deepen their understanding of inheritance patterns and variations.

Questions

  1. MultiChoice

    What is a phenotypic ratio?

  2. MultiChoice

    What is the expected phenotypic ratio from crossing two heterozygous organisms (Aa x Aa)?

  3. MultiChoice

    What percentage of offspring will show the dominant trait in a cross between two heterozygous parents (Bb x Bb)?

  4. MultiChoice

    What percentage of offspring will show the recessive trait in a cross between two heterozygous parents (Bb x Bb)?

  5. MultiChoice

    What is the phenotypic ratio when a heterozygous organism (Aa) is crossed with a homozygous recessive organism (aa)?

  6. MultiChoice

    If 100% of offspring show the dominant phenotype, which cross could have produced them?

  7. MultiChoice

    What percentage of offspring will show the dominant trait from a TT x Tt cross?

  8. MultiChoice

    If a cross produces 50 black mice and 50 white mice (where black is dominant), what was the likely cross?

  9. MultiChoice

    In pea plants, yellow seeds (Y) are dominant over green seeds (y). If two Yy plants cross and produce 400 seeds, how many are expected to be yellow?

  10. MultiChoice

    In the same cross (Yy x Yy producing 400 seeds), how many seeds are expected to be green?

  11. MultiChoice

    If a cross produces 75% round seeds and 25% wrinkled seeds, what were the parental genotypes?

  12. MultiChoice

    If both parents are homozygous recessive (aa x aa), what percentage of offspring will show the dominant phenotype?