What are the organs called that perform different functions but have a similar basic structure?

In peas,a pure tall plant $(TT)$ is crossed with a short plant $(tt).$ The ratio of pure tall plants to short plants in $F_{2}$ is

Why did Mendel choose the pea plant $(Pisum \text{ } sativum)$ for his experiments?

On which of the following plant species has Mendel worked?

If a population of red beetles,living on green bushes,is being eaten by crows. During sexual reproduction,a green beetle is found in the progeny.
$(a)$ What is the future of the new trait?
$(b)$ Will it survive in the new habitat?

In human beings,the statistical probability of getting either a male or female child is $50 : 50$. Give a suitable explanation.