K327 / K328 / 2027

Inheritance

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Which description correctly defines an allele?

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Which comparison is correct?

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R is dominant to r. Which statement about Rr is correct?

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What is the expected phenotype ratio for Rr x Rr when R is completely dominant?

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What offspring genotypes are expected from Rr x rr?

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For Rr x Rr, the first three offspring are round. What is the probability that the next is wrinkled?

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Which combination produces XY in the usual human model?

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Which is an example of a chromosome-number change?

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Question 1 of 5

Construct F1 and F2 crosses

In the stated pea model, R gives round seeds and is completely dominant to r. Cross RR with rr to obtain F1, then cross two F1 plants to obtain F2. Give parental gametes, offspring genotypes and phenotype ratios. Calculate the expected number of wrinkled offspring among 80 F2 offspring.

Define the symbols, combine one allele from each parent, then distinguish genotype from phenotype.

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