Question

In: Biology

You are gifted a Christmas cactus with pink flowers. You know that the allele for pink...

  1. You are gifted a Christmas cactus with pink flowers. You know that the allele for pink flowers (P) is dominant to the allele for white flowers (p).
    1. What are the possible genotypes for your cactus?
    2. You learn that you can cross your cactus with another cactus using a paintbrush to transfer pollen. You realize that this is an opportunity to determine your cactus’s genotype by observing the ratio of flower colors in its offspring. You go to the flower shop to buy another Christmas cactus to cross with yours. The flower shop has both pink and white cactuses for sale. Which one should you buy to perform your cross? Explain your reasoning.
    3. Show your cross by setting up your own Punnett squares below. Use one Punnett square for each potential cross (remember that you don’t know the genotype of your cactus, so each potential genotype will require its own square).
    4. Explain how the results of your cross and your predictions will help you learn the genotype of your cactus.

Solutions

Expert Solution

a) Cactus has pink flowers so possible genotypes are PP and Pp

b) to know the genotype of the Pink flowered cactus we have to choose one which has white flowers, that is a homozygous recessive plant, if we choose a pink-flowered plant it can be either PP or Pp, so we cannot predict the ratio or outcome of the progeny, if the plant is white we know its genotype for sure so the possible outcomes can be predicted.

c) the genotype of the Pink flower can be either PP or Pp.

PP * pp

P P
p Pp ( pink flowers) Pp ( pink flowers)
p Pp ( pink flowers) Pp ( pink flowers)

Pp * pp

P p
p Pp ( pink flowers) pp (white flowers)
p Pp ( pink flowers) pp (white flowers)

d) if the genotype of the pink-flowered cactus is PP then all progenies will have pink flowers.

If the genotype of the pink-flowered cactus is PP then it is possible to have both pink-flowered and white-flowered progenies.

gladiator answered 2 hours ago
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