long wings are dominant to short wings in fruit flies. make a punnett square to show the predicted outcome of a cross between two parents that have both alleles for wing length. what is the ratio of flies produced?
Ll xLl=LL, Li, Li, ii
To create a Punnett square and determine the ratio of flies produced, we need to know the genotypes of both parents. Since both parents have both alleles for wing length (long wings and short wings), we can represent their genotypes as LL and LS, where L represents the dominant allele for long wings and S represents the recessive allele for short wings.
Now, let's construct a Punnett square using these genotypes:
| L | L |
------------------------
L | LL | LL |
------------------------
S | LS | LS |
In this Punnett square, we combine the alleles from one parent (top row) with the alleles from the other parent (left column). Each box within the square represents a possible combination of alleles and therefore a potential genotype for the offspring.
The ratio of flies produced can be determined by examining the genotypes in the Punnett square. From the square, we can see that there are two possible genotypes for the offspring: LL and LS.
Therefore, the ratio of flies produced with long wings to flies produced with short wings is 2:0 or simply 2. This means that all the offspring will have long wings.