Monohybrid Inheritance

This is a flipped learning lesson.

Students - watch the video and answer the questions on the student homework task sheet before your next lesson.

(Teachers - scroll down to view the full lesson plan for this topic.)

Student homework questions:

(As presented in the student homework task sheet)

  1. Distinguish between phenotype and genotype.
  2. a) Distinguish between dominant and recessive alleles. b) How are dominant and recessive alleles symbolized in genetic diagrams?
  3. Explain what is meant by the following terms heterozygous and homozygous.
  4. Look at the genetic diagram below.State what each label represents. Choose from the following:

    the genotype           genes           gametes           the phenotype           a genome           chromosomes           DNA

    A represents: .....................................................................................................................

    B represents: .....................................................................................................................

    C represents: .....................................................................................................................

  5. Draw a genetic diagram showing all possible genotypes, phenotypes and the phenotypic ratio for a cross between two flowers, one has purple petals and the other has yellow petals. Note the following details:
    • The yellow flower is heterozygous.
    • The yellow allele is dominant to the purple allele (the purple allele is recessive).

    State: all possible genotypes, all possible phenotypes, and the phenotypic ratio.

Need more practice?

A revision notes and practice questions pack on Monohybrid Inheritance is available from the Science Sauce store (£3/$4).

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