Question

what are dominant and recessive alleles?​

Answer 1

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Allele, also called allelomorph, any one of two or more genes that may occur alternatively at a given site (locus) on a chromosome. Alleles may occur in pairs, or there may be multiple alleles affecting the expression (phenotype) of a particular trait.

A recessive allele:-

is a version of a gene which must be homozygous when inherited in order to be expressed in the phenotype. If it is inherited alongside a dominant allele, the offspring will not express the recessive allele phenotype, just the dominant allele.

A dominant allele:-

is a variation of a gene that will produce a certain phenotype, even in the presence of other alleles. A dominant allele typically encodes for a functioning protein. ... When a dominant allele is completely dominant over another allele, the other allele is known as recessive.

★What is the difference between dominant and recessive traits?

Dominant traits are always expressed when the connected allele is dominant, even if only one copy of the dominant trait exists. Recessive traits are expressed only if both the connected alleles are recessive.

Different versions of a gene are called alleles.  Alleles are described as either dominant or recessive depending on their associated traits. Since human cells carry two copies of each chromosome? they have two versions of each gene?. These different versions of a gene are called alleles?Alleles can be either dominant? or recessive?

Dominant alleles show their effect even if the individual only has one copy of the allele (also known as being

heterozygous?). For example, the allele for brown eyes is dominant, therefore you only need one copy of the 'brown eye' allele to have brown eyes (although, with two copies you will still have brown eyes).If both alleles are dominant, itis called codominance?. The resulting characteristic is due to both alleles being expressed equally. An example of this is the blood group AB which is the result of codominance of the A and B dominant alleles. 

Recessive alleles only show their effect if the individual has two copies of the allele (also known as being

homozygous?). For example, the allele for blue eyes is recessive, therefore to have blue eyes you need to have two copies of the 'blue eye' allele. 

Answer 2

Answer:

Dominant refers to the relationship between two versions of a gene. Individuals receive two versions of each gene, known as alleles, from each parent. If the alleles of a gene are different, one allele will be expressed; it is the dominant gene. The effect of the other allele, called recessive, is masked.