IB Biology HL D4.1 Natural selection questions

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Question 1

Multiple choiceEasy1 mark

The offspring of a cross between two plants carry combinations of alleles at two genes that were not together in either parent, although every allele was present in at least one parent. What process explains this variation?

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Answer: B. Sexual reproduction combines alleles from the parents, creating new combinations of alleles already present. The alleles themselves need not be new for offspring to show a new combination.

A: confuses a new combination of alleles with a new allele, which mutation can produce.
C: treats a change in allele frequency through natural selection as the source of the offspring’s combination.
D: selects transmission from one parent, rather than the combination of alleles from two parents.

Remember: mutation generates new alleles; sexual reproduction generates new combinations of alleles.

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