Table of Contents
- 1 What happens if you have two recessive alleles?
- 2 How many phenotypes are possible with 2 alleles?
- 3 What is the phenotype of someone who has two different alleles?
- 4 Can a homozygous organism appear to have two alleles?
- 5 When does the white recessive allele increase in frequency?
- 6 What happens if only one allele is expressed at a time?
What happens if you have two recessive alleles?
Recessive alleles only express their phenotype if an organism carries two identical copies of the recessive allele, meaning it is homozygous for the recessive allele. This means that the genotype of an organism with a dominant phenotype may be either homozygous or heterozygous for the dominant allele.
How many phenotypes are possible with 2 alleles?
With two loci and two alleles in a strictly additive model (i.e., no epistasis or other modifying effects) we can have five phenotypic classes aabb
What is the phenotype of someone who has two different alleles?
An organism which has two different alleles of the gene is called heterozygous. Phenotypes (the expressed characteristics) associated with a certain allele can sometimes be dominant or recessive, but often they are neither.
Are two recessive alleles homozygous?
Finally, the genotype of an organism with two recessive alleles is called homozygous recessive.
Can a recessive allele produce a normal phenotype?
B is correct. The mutated allele is recessive to the wild type allele, because a wild type allele will produce a normal phenotype. Although the recessive allele still produces a functional enzyme, it is not functional enough to produce phenotypic change without two copies present.
Can a homozygous organism appear to have two alleles?
A heterozygous individual will appear the same as a homozygous dominant individual. This means that an organisms with two dominant alleles appear the same as an organism with only one functioning allele.
When does the white recessive allele increase in frequency?
If they produce successful offspring, the white recessive allele will increase in frequency in the population. Eventually, the predator will eat all or most of the black rabbits. Although the black allele will decrease in frequency, it will still be the dominant allele.
What happens if only one allele is expressed at a time?
If only one allele is expressed at a time, the different alleles can have no relationship. They will still be selected against by the forces of nature, and more successful alleles will increase in frequency.