What are multiple alleles? Can a person have more than two alleles for a single gene?
I'm in 9th grade biology, so a simple answer will do, but a long answer is fine. Please Help.
- ecolinkLv 71 decade agoFavorite Answer
Multiple alleles means that there are three or more forms of a gene for a trait. That doesn't mean that a person can have all three of them. The person still only gets two ... it's just that there are three or more of the alleles in the gene pool that are available.
I tell my students that it's like having three trays of cookies, each tray having a different kind of cookie. Your instructions are that you may have any two cookies that you want. Can you have two from the same tray? Yes. Can you have two different kinds? Yes, you can have one of one kind and one of a second kind. Can you have one from each of the three trays? No, you can only have two cookies.
That's how multiple alleles work. Blood type is controlled by multiple alleles: A, B, and O. Can a person have AA? Yes. Can a person have OO? Yes. Can a person have AB? Yes. Can a person have BO? Yes (but it makes everybody laugh). Can a person have ABO? No, only two alleles and no more.
So the answer is .... No, a person does not have more than two alleles for a single gene.
Of course there are exceptions, but not normal exceptions. Only abnormal exceptions that happen when a person has an unusual number of chromosomes. If you are just learning genetics, you don't have to worry about these exceptions yet.
- Anonymous1 decade ago
Multiple alleles is a set of three or more alleles or alternative forms of a gene. However, a person can not have more than two alleles of this set - that is, they cannot have more than two alleles for a single gene. This is because you inherit one form of the gene from each parent. Blood type is a good example of this. There is an A, B, and o type alleles, but a person cannot have more than two of these alleles.
However, there is such a thing as a polygenic trait, which is a characteristic (trait) that is controlled by more than one gene. Hair color, skin color, etc. are examples of a polygenic trait.
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- Anonymous5 years ago
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C. A, B, AB and O is your answer. This actually means genotypes: AO, BO, AB, and OO.