Question

in pea plants P represents purple flowers while p represents white , and T represents tall plants while t represents short. Biologist cross two pea plants, each with a genotypic PpTt. We would expect what phenotypic ratio from this dihybrid cross ?

Answer 1

Answer: The phenotypic ratio from the dihybrid cross is 9 purple and tall, 3 purple and white, 3 white and tall; and 1 white and short pea plants.

Explanation: From the information provided: Purple flower is dominant over white flower, while tall is dominant over short.

A dibybrid cross will produce 16 offsprings, 9 will be purple and tall, 3 will be purple and short, 3 will be white and tall while 1 will be white and short.

See the attached punnet square for further illustration

Answer 2

Answer:

in pea plants P represents purple flowers while p represents white , and T represents tall plants while t represents short. Biologist cross two pea plants, each with a genotypic PpTt. We would expect what phenotypic ratio from this dihybrid cross?

PpTt X PpTt= PPTT, PpTt, PpTt, and pptt

Phenotypic ratio is 3:1

Explanation:

From the above crossing, it is pertinent to note that after crossing the two heterozygous Purple tall flowers, the offspring produced are 25% homozygous tall purple flower, 50% tall heterozygous purple flower and 25% homozygous recessive white short flower

Altogether we have 3 tall purple dominant flowers with 1 short recessive white flower