Question

In pea plants, purple flowers (P) are dominant over white flowers (p) and tall stems (T) are dominant over short stems (t). Complete a dihybrid cross for parents with the genotypes: PpTT × ppTt and answer the following in complete sentences.

Describe how you would set up a Punnett square for this cross.
List the likelihood of each possible offspring genotype.
List the likelihood of each possible offspring phenotype.

Answer 1

@thomaster

Answer 2

@tahmina

Answer 3

i have the first answer, ijust dont know the likelihood of either genotype or phenotype

Answer 4

if you draw a punnett square you'll have all answers.

Answer 5

The possible combinations for PpTT are PT and pT
The possible combinations for ppTt are pT and pt

Answer 6

So only 4 combinations:

Answer 7

so how do you tell which ones are for genotype and phenotype

Answer 8

PpTT= purple flower, tall stem
ppTT= white flower, tall stem
PpTt= purple flower, tall stem
ppTt= white flower, tall stem

Answer 9

because a capital P or T means dominant
when you have 1 dominant allele for a trait (color or length) it will have the phenotype of the dominant allele. When you have 2 recessive alleles for a trait the phenotype will be the recessive allele for a trait.
for example:
PP = homozygous (double) for color, purple is dominant so the flower is purple
Pp = heterozygous (2 different) for color. Purple is dominant so the flower is purple
pp = homozygous for color, white is recessive but homozygous so the flower is white.

Answer 10

thank you so much!!!!.... :)) that cleared some things up. but what should i put as my answer??

Answer 11

You would set up a punnett square with the 4 possible allele combinations. These are PpTT, ppTT, PpTt and ppTt.
The possible offspring genotypes are PpTT, PpTt, ppTT and ppTt

The phenotypes of the offspring is.
PpTT= purple flower, tall stem
ppTT= white flower, tall stem
PpTt= purple flower, tall stem
ppTt= white flower, tall stem

So the possible phenotypes are:
-purple flower and tall stem
-white flower and tall stem