Question

Define :
(i) An allele ....................................................................................................
(ii) Codominance.............................................................................................
(iii) Polygenes ..................................................................................................
(iv) Lethal genes ..............................................................................................
.

Answer 1

Answer:

1 an allele is the gene expression

2 Co dominance means both the alleles are express

Answer 2

Answer:

AN ALLELE:

each of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.

CODOMINANCE:

Codominance is a relationship between two versions of a gene. Individuals receive one version of a gene, called an allele, from each parent. If the alleles are different, the dominant allele usually will be expressed, while the effect of the other allele, called recessive, is masked.

POLYGENES:

a gene whose individual effect on a phenotype is too small to be observed, but which can act together with others to produce observable variation.

LETHAL GENES:

Lethal alleles are alleles that cause the death of the organism that carries them. They are usually a result of mutations in genes that are essential for growth or development. Lethal alleles may be recessive, dominant, or conditional depending on the gene or genes involved.

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