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2021-05-14

How is it possible for an offspring to exhibit a recessive trait?

How is it possible for an offspring to exhibit a recessive trait?

Only individuals with an aa genotype will express a recessive trait; therefore, offspring must receive one recessive allele from each parent to exhibit a recessive trait. One example of a recessive inherited trait is a smooth chin, as opposed to a dominant cleft chin.

Is it possible for a recessive gene to become dominant?

It is possible for recessive traits to be the most common (think blue eyes in Sweden) or dominant traits to be rare (think dimples everywhere). So one way a trait can go from recessive to dominant is with a new DNA difference that is dominant and causes the same trait.

Is the recessive trait always hidden?

Every organism that reproduces sexually receives two genes for each trait; they receive one gene from each parent. One of the genes may be stronger; the trait of the stronger gene shows up and is called the dominant gene. The trait of the weaker gene is “hidden” or does not show up and is called the recessive gene.

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What is a recessive trait example?

Examples of Recessive Traits 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 is a trait that can be hidden?

Genetics. An allele that is hidden whenever the dominant allele is present. Recessive Allele. One whose trait always shows up in the organism when the allele is present.

What is a trait give 2 examples?

Traits are essentially physical characteristics. These include things such as fin length, body shape, color patterns, eyesight, and muscle definition. For instance, the smallmouth bass possess highly adapted traits such as keen eyesight and the ability to detect vibrations in the water.

What type of trait always shows up when present?

Dominant – An allele whose trait always shows up in the organism when it is present. 3. Gene – The set of information that controls a trait; in the DNA.

What’s an example of incomplete dominance?

When one parent with straight hair and one with curly hair have a child with wavy hair, that’s an example of incomplete dominance. Eye color is often cited as an example of incomplete dominance.

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What is the other name of incomplete dominance?

Incomplete dominance is when a dominant allele, or form of a gene, does not completely mask the effects of a recessive allele, and the organism’s resulting physical appearance shows a blending of both alleles. It is also called semi-dominance or partial dominance. One example is shown in roses.

What are some examples of alleles?

Gene vs allele: chart

Gene Allele
Determines An organism’s genotype An organism’s phenotype
Number per genus locus One Two
Various Types Alleles Paternal vs maternal Dominant vs recessive
Examples Eye color, hair color, skin pigmentation Blue eyes, brown hair, dark skin

What’s the difference between alleles and genes?

Except in some viruses, genes are made up of DNA, a complex molecule that codes genetic information for the transmission of inherited traits. Alleles are also genetic sequences, and they too code for the transmission of traits. The short answer is that an allele is a variant form of a gene.

Is eye color an allele?

Eye color is not an example of a simple genetic trait, and blue eyes are not determined by a recessive allele at one gene. Instead, eye color is determined by variation at several different genes and the interactions between them, and this makes it possible for two blue-eyed parents to have brown-eyed children.