The heterozygous plants are purple, therefore purple is the dominant allele.
Assuming it is a single gene with only two possible alleles and the other colour is white; a cross between two heterozygous plants (Pp X Pp) should produce 3 purple and 1 white offspring. This means 3/4 will be purple.
1 offspring will have the genotype PP (purple), 2 will have Pp (purple) and 1 will have pp (white).
There's not enough information to answer this completely based on the question.
Are the plants homo or heterozygous?
Which traits are dominent and which are recessive?
Here's the basics:
Call the dominent trait 'A', and the recessive 'a' and using basic Mendelian genetics the parents can be AA, Aa, or aa:
Aa crossed with Aa in a chart looks like this:
A a
__________
A| AA | Aa|
a| Aa | aa|
So, 25% AA, 25% aa, 50% Aa
You can do the same thing with two traits, but the matrix is larger.
A punnett square shows the genotype of the offspring from which a phenotype can be determined if there is an understanding of how the alleles affect the appearance of the offspring.
Least complicated would single alleles from each parent where parent AA is crossed with parent AA.
In this case all offspring have the same phenotype so there is no ratio. Cossing Aa parents results in AA, Aa and aa offspring where based on phenotype AA and Aa are the same and aa is different.
The ratio in this case would be 3:1 for phenotype.
there's 1/2 or 50% chance that the offspring will be a heterozygous purple plant and 1/2 or 50% chance that the offspring will be a white flowered plant. ----
50% percent chance of being a purple flower.
Let's say T=dominant trait and t=recessive trait
T t
T TT Tt
t Tt tt
So, 1 TT, 2 Tt, and 1 tt
You will get 2 PP and 2 Pp. You only see purple flowers (phenotype).
3:1 ratio
2 Rr, 1 RR, 1 rr
2 long, 2 short
Apex is 2 short, 2
A punnett square is a device used to predict the different allele composition of offspring from the cross of two individuals.
Mendel Diagrams. If the offspring gets a dominate gene from both parents, the offspring will exhibit traits from the dominate gene. If the offspring gets a dominate gene from one parent and a recessive gene from another, the offspring will exhibit traits from the dominate gene. If the offspring get a recessive gene from both parents, the offspring will exhibit traits from the recessive gene.
The tool used to visualize all of the possible combinations of alleles from parents to offspring is called a punnett square.
The punnett square is used to determine the probability of an offspring inheriting a trait from it's parents.
Punnett Square
all dominant
Make a punnett square! 50% Hh 50% hh
In genetics a type of grid is used to show the gametes of each parent and their possible offspring and also called the checkerboard is used. The Punnet Square is named after Reginald Crundall Punnett an English geneticist.
Punnett square
What is the ratio of heterozygous offspring to total offspring in the punnett square
punnett square
usung a punnett square
tall and short
punnett squares
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.
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Possible offspring alleles