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Albinism is expressed only in individuals with the homozygous recessive genotype, represented as "aa." This means that both alleles for the trait must be the recessive form for the characteristic to manifest. Individuals with at least one dominant allele ("AA" or "Aa") will not express albinism.

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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.


Is albanism autosomal?

Yes, albinism is typically caused by autosomal recessive gene mutations. This means that an individual needs to inherit two copies of the mutated gene (one from each parent) to express the albinism trait.


Is albinism a x-linked gene or a y-linked gene?

Albinism is not an X-linked or Y-linked trait; it is typically inherited in an autosomal recessive manner. This means that the genes associated with albinism are located on non-sex chromosomes (autosomes). Individuals must inherit two copies of the mutated gene, one from each parent, to express the condition.


On a recent trip to the pet store, you saw an albino python. The informant on the cage stated the father of the snakes has the genotype Aa. You researched and found out albinism is a recessive trait (a). What could be the possible genotypes of the mother?

To express a recessive trait, this snake must be aa. Since the father is Aa, the mother can be Aa or aa. The only thing we know is that it can not be AA, because if either parent was AA then it would be impossible for the offspring to express the recessive trait. If both parents were Aa then there was a 25% chance of the child expressing the recessive trait, and if one was Aa and the other was aa then there would be a 50% chance.


What is an example of recessive trait?

'Albinism' (being an albino, without skin pigmentation) is an example of a recessive trait. Specifically, it is an expressed recessive trait, because that person does not have the dominant gene at all, only two copies of a recessive gene. For a person to be an albino, his/her parents BOTH had to have the recessive gene and the offspring had to inherit THOSE TWO copies and can now only 'express' the recessive gene. There is no dominant gene to undo the albino trait. Side note: there is more than one form of albinism recognized in medical science, but all are examples of recessive traits. Another example of a recessive trait would be 'sickle-cell disease/anemia.'


How are albino humans born?

Albino humans are born due to a genetic mutation that affects melanin production, the pigment responsible for skin, hair, and eye color. This condition is typically inherited in an autosomal recessive manner, meaning a child must receive two copies of the mutated gene, one from each parent, to express albinism. As a result, individuals with albinism have little to no melanin, leading to lighter skin, hair, and eye color, as well as potential vision problems.


IS IT POSSIBLE TO HAVE A RECESSIVE TRAIT APPEAR IN OFFSPRING IF THE GENOTYPE IS HETEROZYGOUS?

No, a heterozygous genotype, which consists of one dominant and one recessive allele (e.g., Aa), will typically express the dominant trait, not the recessive one. However, if both parents are heterozygous (Aa), there's a possibility for offspring to inherit two recessive alleles (aa), which would express the recessive trait. Thus, while a heterozygous individual cannot express a recessive trait, such traits can appear in their offspring if the right allele combinations occur.


What is the differences between homozygous dominant and homozygous recessive and heterozygous?

Homozygous dominant individuals have two copies of the dominant allele for a trait, homozygous recessive individuals have two copies of the recessive allele, and heterozygous individuals have one copy of each allele. Homozygous dominant and heterozygous individuals will express the dominant trait, while homozygous recessive individuals will express the recessive trait.


What is a genotype composed of?

Genotype is the genetic make up of an organism both expressed (phenotype) and unexpressed.Example: AaeeDndn is the genotype which includes unexpressed (recessive) alleles a and dn.Expressed dominant traits A and Dn as well as expressed recessive traits (ee). Note that expressed recessive traits have to be homozygous.


Which allele is recessive and which is dominant in the abbreviation Bb?

In the abbreviation Bb, the "B" allele is dominant and the "b" allele is recessive. Therefore, an individual with the genotype Bb would express the dominant "B" allele.


What following genotypes will express a dominant trait?

For a dominant trait to be expressed, you either need a RR or an Rr genotype. The other genotype, rr, is recessive only. In genetics, capital letters represent a dominant allele, and lower case letters represent the recessive allele.


What combination of alleles could produce a trait controlled by a dominant allele?

genotype