02-Jan-2016 03:39


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In the sweet pea plant, flowers may be either purple or white.

The colour is determined by two allelomorphic pairs of genes (R, r and S, s).

If a colour-blind female is crossed with a normal male then what is the theoretical ratio of the offspring?


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If a mother has blood of group O and her daughter has blood of group A, what are the possible blood groups for the father?

Questions From a mating of two dihybrid individuals (e.g.

Aa Bb x Aa Bb) how many of the 16 possible zygote combinations would be expected to contain only two dominant genes?

- What is the probability the boy’s sister will be a carrier Two people have blood groups of A and B respectively.


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What is the probability they will have a child who is blood group AB?

If at least one dominant gene from each allelomorphic pair is present, then the flower colour is purple. If two purple plants each of the genotype Rr Ss are crossed, then what is the expected phenotypic ratio of the offspring?