The continuity of features from one generation to another is known as

In snails, individuals can change sex, indicating that sex is not genetically determined in them.

There is a sub-population $A$ and another sub-population $B$. Both are separated by a natural barrier. What will happen in such a case?

Natural selection directs evolution as it results in adaptations in a given population.

What is the genetic constitution of the $23$rd pair of sex chromosomes in a human male?

$A$ guinea pig having black color,when crossed with a guinea pig having the same color,produced $80$ offspring,out of which $60$ were black and $20$ were white. Now,find out:
$(i)$ What is the possible genotype of the guinea pig?
$(ii)$ Which trait is dominant and which trait is recessive?
$(iii)$ What is this cross called,and what is its phenotypic ratio?