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lana66690 [7]
3 years ago
14

What is a recessive allele?

Biology
2 answers:
irinina [24]3 years ago
7 0
An allele that can only be expressed when no dominant allele is present
tangare [24]3 years ago
7 0

Answer:

B/2. An allele that is only expressed when no dominant allele is present.

Explanation:

Alleles always come in pairs, and we represent them with letters. Uppercase letters represent dominant alleles, and recessive alleles are represent by lowercase letters.

A recessive trait can only appear when the pair of alleles contains 2 lowercase letters, otherwise, if there are 2 uppercase letters or 1 of each, a dominant trait will be seen.

So:

AA - a pair of 2 dominant alleles (here we get a dominant trait).

Aa - a pair of 1 dominant and 1 recessive allele (here we get a dominant trait)

aa - a pair of 2 recessive alleles (here we get a recessive trait).

→ As we can see, we only get a recessive trait when there is a pair of 2 recessive alleles, therefore no dominant alleles in the pair.

Hope it helped,

BiologiaMgaister

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espero que te ayude

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