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Inheritance and Evolution
Quick questions on Monohybrid inheritance and genetic crosses: H2 Biology Inheritance and Evolution
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is codominance?Show answer
In codominance, both alleles are expressed in the heterozygote, so neither masks the other. Crossing two heterozygotes for a codominant pair gives a 1:2:1 phenotypic ratio, because the heterozygote has its own distinct phenotype.
What is q1?Show answer
Define the term heterozygous. [1 mark]
What is q2?Show answer
A cross between two heterozygous tall pea plants (Tt x Tt) is carried out, where T (tall) is dominant to t (short). State the expected ratio of tall to short offspring. [1 mark]
What is q3?Show answer
Explain why a female can be an unaffected carrier of a recessive sex-linked condition but a male usually cannot. [2 marks]
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