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Any cross of parents for a single trait where the dominant allele completely masks any expression of the recessive allele as follows:
Parents are both heterozygous for the trait. For example Aa X Aa produces 75% of offspring with the dominant phenotype and 25% with the recessive phenotype.
One parent is heterozygous for the trait and the other parent is homozygous recessive. For example: Aa X aa produces 50% offspring with the dominant phenotype and 50% offspring with the recessive phenotype.
If the trait is co-dominant/non-dominant a heterozygote would have the median characteristic and a homozygote could be either of two phenotypes. If T is tall and t is short the Tt offspring would be
medium in this example. The way to produce offspring with only two phenotypes would be to cross a heterozygous parent with a homozygous parent. For Example:
Tt X tt cross would produce 50% tt (short) offspring and 50% Tt (medium) offspring. A TT X Tt cross would produce 50% TT (tall) offspring and 50% Tt (medium) offspring.
A trait determined by a single gene with two alleles will typically have only two possible phenotypes, one associated with each allele. Examples include pea plant seed color (yellow or green) and human blood type (A or B).
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What is the name of the chart that shows possible phenotypes and genotypes and genotypes?
The chart you are referring to is called a Punnett square. It is used to predict the possible genotypes and phenotypes of offspring resulting from a genetic cross between two individuals.
What happened to the proportions of the two phenotypes as the F1 generation grew from 10 to 100 offspring?
The proportions of the two phenotypes in the F1 generation remained constant as the number of offspring increased from 10 to 100. This is because the inheritance of traits follows Mendelian principles, and the ratio of phenotypes will only change if there is an assortment such as independent segregation.
Is it possible for 2 alleles to produce four phenotypes?
Yes which ever of the two alleles is dominant, then the phenotype will take the one of the dominant. they can be codominant, so in that case, you might be able to produce 4 phenotypes. it depends if the two alleles create 4
How many phenotype can result from the cross TtYy x ttyy?
Four phenotypes can result from the cross TtYy x ttyy. The four possible phenotypes are: TY, Ty, tY, and ty. This is because the offspring can inherit different combinations of alleles for the two genes, resulting in different trait combinations.
Distinguish between parental and recombinant phenotypes?
Parental phenotypes are the phenotypes that are seen in the offspring that are the same as the phenotypes of the parents. Recombinant phenotypes are the phenotypes that are the result of recombination events during genetic crossing, resulting in combinations of traits not present in the parents.
How many phenotypes are possible from complete dominance allels?
Two
How many phenotypes does the trait have?
Aa AA aa If A dominant, two phenotypes.
What is the name of the chart that shows possible phenotypes and genotypes and genotypes?
The chart you are referring to is called a Punnett square. It is used to predict the possible genotypes and phenotypes of offspring resulting from a genetic cross between two individuals.
A polygenic trait can have?
Many possible genotypes, producing ,any possible phenotypes.
The number of possible phenotypes for a given trait depends on how many what control the trait?
The number of possible phenotypes for a given trait depends on how many genes control the trait. Each gene may have multiple alleles that can interact to produce different phenotypes. Additionally, environmental factors can also influence the expression of these genes, further increasing the diversity of possible phenotypes.
Why isn't it possible to have more genotypes than phenotypes?
I think you have the question backwards, "Why isn't it possible to have more phenotypes than genotypes?" There are always more or an equal number of genotypes relative to phenotypes. The phenotype for a simple dominant/recessive interaction (for example) T for tall and t for short where TT is tall, Tt is tall and tt is short has three genotypes and two phenotypes. If T and t are co-dominant then TT would be tall, Tt would be intermediate and tt would be short. (Three phenotypes and three genotypes.)
What polygenic trait can have many possible genotypes and -?
Many possible genotypes, producing ,any possible phenotypes.
Is it possible for 2 alleles to produce 4 phenotypes?
yes
Does a moose have two phenotypes?
dkOD
What happened to the proportions of the two phenotypes as the F1 generation grew from 10 to 100 offspring?
The proportions of the two phenotypes in the F1 generation remained constant as the number of offspring increased from 10 to 100. This is because the inheritance of traits follows Mendelian principles, and the ratio of phenotypes will only change if there is an assortment such as independent segregation.
A codominant trait with 3 alleles X Y Z how many possible phenotypes are there?
There are 6 possible phenotypes: X, Y, Z, XY, XZ, and YZ. Each allele can combine with another to produce a unique phenotype.
Which cross will yield four phenotypes in the ratio?
A phenotype is the composite of an organism's observable traits. The answer to the question, the cross that will yield four phenotypes in the 1:1:1:1 ratio is fifty.
