Dihybrid inheritance

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What is dihybrid inheritance?
A characteristic inherited on 2 different genes
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What are dihybrid crosses used for?
To show the inheritance of 2 different characteristics
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Using the example of pea seed plants (round yellow seeds being dominant and green wrinkled seeds being recessive) show the different alleles
Yellow- Y (dominant), green- y (recessive), round- R (dominant), wrinkled- r (recessive)
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Suggest the possible gametes for a yellow round seed
YR, YR
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Suggest the possible gametes for a wrinkled green seed
yr, yr
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If a round yellow seed crossed with a wrinkled green seed, what would be the phenotype of their offspring?
They would all be yellow round as they would all contain the dominant allele for each characteristic from the yellow round seed
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What would the genotype be for the offspring?
They would all be YyRr
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In the second generation, what are the possible gametes?
YR, Yr, yR, yr
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Suggest a reason for why the expected ratios arent always the same as the actual ratios of the offspring
Fertilisation of gametes is a random process so in a small sample you are more likely to get a skewed ratio due to a few chance events
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Other cards in this set

Card 2

Front

What are dihybrid crosses used for?

Back

To show the inheritance of 2 different characteristics

Card 3

Front

Using the example of pea seed plants (round yellow seeds being dominant and green wrinkled seeds being recessive) show the different alleles

Back

Preview of the front of card 3

Card 4

Front

Suggest the possible gametes for a yellow round seed

Back

Preview of the front of card 4

Card 5

Front

Suggest the possible gametes for a wrinkled green seed

Back

Preview of the front of card 5
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