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Albinism is a recessive trait what is the only genotype that would express albinism?
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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.'
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 the differences between homozygous dominant and homozygous recessive and heterozygous?
A homozygous dominant genotype means that both alleles for a trait are dominant. A heterozygous genotype means that one allele is dominant and the other is recessive. A heterozygous genotype will express the dominant phenotype, not the recessive phenotype.
What combination of alleles could produce a trait controlled by a dominant allele?
genotype
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.
In a hybrid individual the trait that is covered and not expressed is the what trait?
recessive
How do you write genes to express dominat and recessive?
Dominant: upper case letterRecessive: lower case letterUsually the letter that is used is the first letter of the recessive trait, for instance since albinism is a recessive trait, someone who is an albino would have aa. Someone who is not would either be Aa or AA.In other examples you use a upper case letter and a superscript letter, usually the first letter of the name. For instance daltonism, which is recessive and linked to the X chromosome, would be XDXd for a female carrier, XdXd for a daltonic female and XdY for a daltonic male.For blood types, for type O, which is recessive, would be ii. Type A would be either IAi or IAIA. Type B would be either IBi or IBIB and type AB would be IAIB.
What must the genotype of an X-linked recessive trait be for a woman to express it?
If the woman does not show the trait, she must have a dominant allele (version of the gene); let's call it A. She also carries the recessive gene, a. So her genotype is Aa. This means that half her ova (gametes) will contain the dominant A, half a.The rest is up to the sperms; half of them will carry an X chromosome, with either A or a on it (unless there are more than two alleles involved).
Why phenotypes don't always express its entire genotype?
Phenotypes are the entirety of the observable traits. Genotypes are the instructions in the genetic code. Dominant alleles override the recessive alleles, making only the dominant alleles expressed.
Is it easier to analyze genotype by observing phenotype in organisms with complete dominance or in organisms with incomplete dominance?
It is easier to analyze genotype by observing phenotype in organisms with incomplete dominance (also known as codominance), because in incomplete dominance the individual will show a specific phenotype for each situation, whether it is homozygous dominant, heterozygous, or homozygous recessive. For example, in flowers, such as the ones that Mendel studied, a homozygous dominant flower will be red, a homozygous recessive flower will be white, and a heterozygous flower will be pink. In complete dominance, a heterozygous will only express the dominant phenotype, as opposed to incomplete dominance, in which a heterozygous individual will express a phenotype that is representative of both of the dominant and recessive traits. Because heterozygous individuals in complete dominance express the dominant phenotype, it is hard to determine whether the genotype is homozygous dominant or heterozygous for the trait. Hope this helps!
How are dominant and recessive traits represented?
Autosomal recessive alleles ( both males and females) and X-linked alleles in females always express themselves in homozygous condition. On other hand, X -chromosome linked recessive allele express singly in males.
What gene is masked if it is paired with a dominant gene?
The different forms of a gene are called alleles. In Mendelian genetics, a gene has a dominant allele and a recessive allele. The dominant allele masks the recessive allele if present. So there are two possible dominant genotypes: homozygous dominant, in which both dominant alleles are present; and heterozygous, in which one allele is dominant and the other allele is recessive. The only way to express a recessive trait is to have the homozygous recessive genotype.
