Allelic interactions Flashcards

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1
Q

What is the F2 phenotypic ratio seen for a typical monohybrid cross with complete dominance?

A

3:1

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2
Q

What is the F2 phenotypic ratio seen for a typical dihybrid cross with complete dominance?

A

9:3:3:1

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3
Q

What is haplosufficiency? What kind of allelic interaction has this?

A

When one allele is sufficient to have that phenotype show. The heterozygote will have the same phenotype as the homozygote for that allele. This is occurring for complete dominance

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4
Q

What is haploinsufficiency? What kind of allelic interaction has this?

A

When a single allele isn’t enough for that phenotype to show, rather the heterozygote will be a blend of the two alleles. This occurs for incomplete dominance

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5
Q

What is the F2 phenotypic ratio seen for incomplete dominance in a monohybrid cross?

A

1:2:1

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6
Q

What is the F2 phenotypic ratio seen for codominance in a monohybrid cross?

A

1:2:1

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7
Q

Which allele is dominant when traits are codominant?

A

Neither one is dominant over the other, so they both show

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8
Q

What is the F2 phenotypic ratio seen for a lethal allelic interaction in a monohybrid cross?

A

2:1. The homozygous dominant die early in embryonic development

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9
Q

How do we define what sort of interaction certain alleles have?

A

Defined with respect to a single specific phenotype

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10
Q

How do allelic interactions work when there are multiple alleles?

A

A diploid individual can’t have more than 2 alleles at a time, but they all might interact differently

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11
Q

What are the 3 alleles for human blood type?

A

IA, IB, i

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12
Q

What is the allelic interaction between IA and i?

A

Complete dominance

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13
Q

What is the allelic interaction between IB and i?

A

Complete dominance

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14
Q

What is the allelic interaction between IA and IB?

A

Codominance

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