Who was the first scientist to perform a series of experiments to study acquired and inherited traits?

$A$ child who inherits an $X-$chromosome from her father will be a boy.

Two pea plants,one with round green seeds $(RRyy)$ and another with wrinkled yellow $(rrYY)$ seeds,produce $F_1$ progeny that have round,yellow $(RrYy)$ seeds. When $F_1$ plants are selfed,the $F_2$ progeny will have new combinations of characters. Choose the new combinations from the following:
$(i)$ Round,yellow
$(ii)$ Round,green
$(iii)$ Wrinkled,yellow
$(iv)$ Wrinkled,green

The preserved traces of all living organisms are called fossils.

Does the genetic combination of mothers play a significant role in determining the sex of a newborn?

Which of the following statements is not true with respect to variation?