Which type of animals were the Dinosaurs having feathers?

Which of the following statements is $NOT$ true regarding the $F_{1}$ generation plants obtained by crossing pure tall and pure dwarf pea plants?

Humans have a genetic basis for sex determination.
$(a)$ Besides humans,which organisms have a genetic basis for sex determination?
$(b)$ Which chromosomes are similar in human males and females?
$(c)$ What is the function of these types of chromosomes?

Some dinosaurs had feathers although they could not fly,but birds have feathers that help them to fly. In the context of evolution,this means that:

What are sex chromosomes? Which sex chromosomes are found in male and female human beings? State the chromosome responsible for the development of a male child in human beings?

All the variations in a species do not have equal chances of survival. Why?