$A$ palaeontologist (a scientist who studies fossils) finds the fossil of an organism in a deeper layer of the Earth. What method will they use to estimate its age?

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

$........$ is the unit of heredity.

What evidences can suggest that, "Modern human beings have originated in Africa"?

Study the following cross and the self-pollination in $F_1$. Fill in the blank and answer the question that follows:
Parents: $RRYY \times rryy$
(Round,yellow) (Wrinkled,green)
$F_1$: $RrYy \times$ ?
(Round,yellow)
What are the combinations of characters in the $F_2$ progeny? What are their ratios?

$A$ trait in an organism is influenced by