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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.
Wiki User
∙ 8y ago
Wiki User
∙ 11y agosingle-gene and polygenic
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Scientists compare two different plant species. In species A the leaf color is controlled by two alleles. In species B leaf color is controlled by five alleles. How will these two plants be different?
Species A will have fewer phenotypes. (apex)
How many different phenotypes can be produced from intercrossing parents of genotype AaB1B2?
two
What is the name of the chart that shows possible phenotypes and genotypes and genotypes?
punnet square
Distinguish between parental and recombinant phenotypes?
Parental Phenotypes are when the offspring of two parents look like one of the two parents. for example, if a green wrinkled pea is crossed with a heterozygous yellow round pea the offspring are 1/4 yellow round, 1/4 green wrinkled, 1/4 yellow wrinkled, and 1/4 green round. the yellow round and green wrinkled look like the parents so they have parental phenotypes, whereas the yellow wrinkled and the green round have combinations of the parental phenotypes thus they have recombinant phenotypes.
Which can you physically see genotypes or phenotypes?
You can see the phenotype. A good way to remember is that a photograph is what you see. The genotype is the graphic representation of the trait.
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.
A polygenic trait can have?
Many possible genotypes, producing ,any 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
AAA AAA what are the possible genotypes and phenotypes os their children?
Possible genotypes would be AA and Aa. Phenotypes cannot be determined here because they are the physical, observable results of a genotype.
Does a moose have two phenotypes?
dkOD
When two extreme phenotypes are selected in natural selection the intermediate phenotypes become?
Highly reduced, or, nonexistent.
The number of possible phenotypes for a given trait depends on how many what control the trait?
Alleles
How do you find possible phenotypes in offspring?
The possible genotypes and phenotypes of the offspring can be determined using a Punnett square, a grid that shows the possible combinations of alleles that can result at fertilisation. The Punnett square below shows the expected genotypes of the offspring of parent pea plants that both have the genotype Rr.
A codominant trait with 3 alleles X Y Z how many possible phenotypes are there?
Eight.
