Question

When pink flowers four O'clock plant is crossed with a red flower plant.What is the probability of;
a;red flower plant
b;pink flower plant
c;ratio of pink to red flower plant

Answer 1

When pink flowers of a four O'clock plant are crossed with a red flowered plant, there is a 50%probability of a red flower and a 50% probability of a pink flower. Their ratio will be 1:1.

What is incomplete dominance?

When neither of the two alleles in a genotype is dominant over the other and their crossing results in a phenotype that is intermediate of the dominant and recessive phenotypes is called incomplete dominance.

In the case of a four O'clock plant, if red and white flowered plants are crossed,

     R         R

w   Rw      Rw

w    Rw     Rw

All the flowers will have an Rw genotype which represents pink flowers.

Now, if pink and red flowers are crossed,

      R         W

R    RR       RW

R     RR      RW

It will result in half the flowers being red and half of them being pink.

Therefore, there is a 50% probability of a red flower and a 50% probability of a pink flower. Their ratio will be 1:1.

Read more about incomplete dominance, here

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