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VICBiologyQuick questions
Unit 2: How does inheritance impact on diversity?
Quick questions on Two-gene crosses: linked and unlinked genes: VCE Biology Unit 2
5short 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 independent assortment?Show answer
Mendel's Second Law (the Law of Independent Assortment) says that alleles of one gene segregate into gametes independently of alleles of another gene. This holds when the two genes are on different chromosomes or are far apart on the same chromosome.
What is identifying linkage from data?Show answer
A test cross is the cleanest way to detect linkage because it strips away the dominance complication.
What is q1?Show answer
Distinguish between linked and unlinked genes with respect to their position on chromosomes and inheritance pattern. [2 marks]
What is q2?Show answer
A dihybrid test cross gives 405 AaBb, 12 Aabb, 17 aaBb and 396 aabb offspring. Calculate the recombination frequency and state whether the two genes are linked. [3 marks]
What is q3?Show answer
Refer to two genes A and B with recombination frequency 25 percent. (a) State the genetic distance in centimorgans. (b) Predict the four offspring classes and their approximate ratios from an AaBb x aabb test cross.
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