In $Lathyrus$ $odoratus$,a hybrid blue-flowered and long-pollen plant is test-crossed with a homozygous recessive red-flowered and round-pollen plant. How many parental types are obtained when genes are present in the $cis$ stage in parents (in $\%$)?

Select the correct statement from the ones given below with respect to dihybrid cross.

What is the name of the pea species used by Bateson and Punnett in their experiments?

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$:
Mendel's law of independent assortment does not hold good for the genes that are located closely on the same chromosome.
Reason $(R)$:
Closely located genes assort independently.
In the light of the above statements,choose the correct answer from the options given below:

State the contribution of the following scientists: Thomas Hunt Morgan and Alfred Sturtevant.

What map unit (Centimorgan) is adopted in the construction of genetic maps?