Inherited Change (AQA A-Level Biology): Quizzes

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Multiple Alleles
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What does the term 'multiple alleles' mean for a gene?

The gene has more than two versions

Why can an individual only carry two alleles for any gene?

We have two homologous chromosomes

What does the IOI^O allele produce on red blood cell surfaces?

No antigens

What is the relationship between IAI^A and IBI^B alleles?

They are codominant

What is the genotype for blood group O?

IOIOI^O I^O

What blood groups can result from a cross between blood group AB and O parents?

Only A and B

What genotype produces a roan coat in shorthorn cattle?

CRCWC^R C^W

What phenotypic ratio results from crossing two roan-coated cattle?

1 red : 2 roan : 1 white

Why do Siamese cats have darker fur on their extremities?

Tyrosinase works better at lower temps

What characterises individual hairs in a roan-coated animal?

Each hair is completely red or white

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