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What are some examples of dominant and recessive alleles?

What are some examples of dominant and recessive alleles?

For example, having a straight hairline is recessive, while having a widow’s peak (a V-shaped hairline near the forehead) is dominant. Cleft chin, dimples, and freckles are similar examples; individuals with recessive alleles for a cleft chin, dimples, or freckles do not have these traits.

What are dominant and recessive alleles?

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.

What is an example of a dominant?

The definition of dominant is a person who is in a position of power or who is exhibiting powerful or controlling tendencies. An example of dominant is a strong and powerful CEO. An example of a dominant gene is the brown-eyed gene, compared to the blue-eyed gene which is recessive.

What is dominant and give example?

A classic example of dominance is the inheritance of seed shape (pea shape) in peas. Peas may be round (associated with allele R) or wrinkled (associated with allele r). In this case, three combinations of alleles (genotypes) are possible: RR and rr are homozygous and Rr is heterozygous.

What is an example of a recessive allele?

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.

What traits are dominant?

(In genetic terms, a dominant trait is one that is phenotypically expressed in heterozygotes). A dominant trait is opposed to a recessive trait which is expressed only when two copies of the gene are present. (In genetic terms, a recessive trait is one that is phenotypically expressed only in homozygotes).

How do you tell who has dominant genes?

1) If a person shows a trait that is dominant then at least one of their parents must always show the trait. This rule comes from the fact that the dominant allele always wins. Based on the rule, it seems that brown is the dominant trait. We can tell this by looking at the second generation.

How are high IQ brains different?

People with a higher-than-average intelligence level have brains that are “wired” in a different way, researchers say. A new study suggests that intelligence is linked with increased connectivity between some regions, and reduced interaction between others.