By the process of artificial selection in evolution, which of the following is developed using sterile flowers?

When a sperm carrying an $X$ chromosome fertilizes an ovum,what will be the sex of the embryo that develops from the zygote?

With the help of suitable examples,explain why certain traits cannot be passed on to the next generation. What are such traits called?

$(a)$ Distinguish between homologous and analogous organs.
$(b)$ State one evidence of organic evolution.

What are the differences that arise among organisms of the same species called?

Homologous organs are different from analogous organs. Mention the two basic characteristics that decide about analogy and homology between the two organs.