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Genetic conditions controlled by a recessive allele include cystic fibrosis, sickle cell anemia, and Tay-Sachs disease. In these disorders, an individual must inherit two copies of the recessive allele (one from each parent) to express the condition. Carriers, who have only one copy of the recessive allele, typically do not show symptoms but can pass the allele to their offspring. Other examples include phenylketonuria (PKU) and certain forms of hereditary deafness.
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What carrier of a trait controlled by a allele does not express the trait?
A carrier of a trait controlled by a recessive allele possesses one copy of the recessive allele and one copy of the dominant allele. This means that they do not express the trait associated with the recessive allele because the dominant allele masks its effect. However, the carrier can pass the recessive allele to their offspring, who may express the trait if they inherit two copies of the recessive allele.
When will a trait controlled by a recessive allele be shown?
only when two recessive alleles are present
What is a genetic factor that is blocked by the presence of a dominant factor?
A genetic factor that is blocked by the presence of a dominant factor is known as a recessive allele. In a heterozygous genotype, where one allele is dominant and the other is recessive, the dominant allele's traits will be expressed while the recessive allele's traits are masked. For example, in pea plants, the allele for tall stems (dominant) will override the allele for short stems (recessive), resulting in all offspring displaying the tall phenotype.
What happens to a characteristic when there is only one recessive allele?
When there is only one recessive allele present for a characteristic, the dominant allele will be expressed in the phenotype. The individual will exhibit the trait associated with the dominant allele, while still carrying the recessive allele in their genetic makeup.
What is hidden in the heterozygote?
In a heterozygote, there are two different alleles for a specific gene. One allele is dominant and will be expressed, while the other allele, called the recessive allele, is not expressed but is still present in the genetic makeup of the individual. The recessive allele is "hidden" in the heterozygote because its presence does not affect the outward appearance or expression of the dominant allele.
Is albinism controlled by a dominant allele o recessive allele?
It is controlled by a recessive allele.
Is albinism controlled by a dominant allele or by a recessive allele?
Recessive allele.
Is straight hair controlled by a dominate allele or recessive allele?
Straight hair is typically controlled by a dominant allele. Curly hair is usually controlled by a recessive allele.
Which allele (gene) exhibits its trait only when it is paired with another allele in a genetic cross?
Recessive allele exhibits its trait only when paired with another recessive allele in a genetic cross.
What carrier of a trait controlled by a allele does not express the trait?
A carrier of a trait controlled by a recessive allele possesses one copy of the recessive allele and one copy of the dominant allele. This means that they do not express the trait associated with the recessive allele because the dominant allele masks its effect. However, the carrier can pass the recessive allele to their offspring, who may express the trait if they inherit two copies of the recessive allele.
What combination of alleles could produce a trait controlled by a recessive allele?
recessive + recessive or tt
When will a trait controlled by a recessive allele be shown?
only when two recessive alleles are present
What is being carried by a genetic carrier?
A genetic carrier has a dominant and a recessive version of an allele. Normally, the term genetic carrier is used in relation to genetic illnesses where two copies of the recessive allele cause that illness. Therefore, a carrier does not have the illness themself (as the dominant, non-disease allele is expressed over the recessive allele). However, they have the ability to create an offspring who has the double recessive genotype and therefore has the condition if they mate with another carrier or someone who is double recessive (who has the disease).
Albinism is a recessive trait in humans that is controlled by a single gene how many recessive alleles must a person have to have albinism?
2
What is a genetic factor that is blocked by the presence of a dominant factor?
A genetic factor that is blocked by the presence of a dominant factor is known as a recessive allele. In a heterozygous genotype, where one allele is dominant and the other is recessive, the dominant allele's traits will be expressed while the recessive allele's traits are masked. For example, in pea plants, the allele for tall stems (dominant) will override the allele for short stems (recessive), resulting in all offspring displaying the tall phenotype.
Are smile dimples controlled by a recessive allele?
Nope, the alleles for smile dimples are actually dominant, not recessive.
How is albinism controlled by a recessive allele?
Albinism is a genetic condition caused by mutations in genes responsible for producing melanin, the pigment that gives color to skin, hair, and eyes. It is typically inherited as an autosomal recessive trait, meaning that an individual must inherit two copies of the recessive allele—one from each parent—to express the condition. If a person has only one copy of the recessive allele, they are considered a carrier but will not show symptoms of albinism. Thus, the presence of the recessive allele must be homozygous (two copies) for the phenotype of albinism to manifest.
