Question

Which of the following best describes the relationship between a gene and an allele?
Question 10 options:

A gene is a variant of an allele.

A gene is always recessive to an allele.

An allele is a variant of a gene.

A gene is always dominant to an allele.

Answer 1

A gene is a variant of an allele.chromosomes have the same genes, but might have different versions of those genes. The different possible versions of the genes are called alleles.

Answer 2

The statement 'an allele is a variant of a gene' BEST describes the relationship between a gene and an allele.

• An allele is a gene variant, whereas a gene is a specific protein coding fragment of DNA located at the same position or 'locus' on a given chromosome.

• A diploid (2n) organism receives two copies or alleles of the same gene, one allele from the mother and the other allele from the father.

• In cases of complete dominance, the dominant allele completely masks the expression of the recessive allele in heterozygous individuals, i.e., in individuals that carry two different alleles for the same gene locus.

In conclusion, the statement 'an allele is a variant of a gene' BEST describes the relationship between a gene and an allele.

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