Two pink coloured flowers on crossing resulted in $1$ red,$2$ pink and $1$ white flower progeny. The nature of the cross will be

$A$ trait in an organism is influenced by

In an area $A$,the leaf materials available to beetles were very less. What are the two consequences seen in case of beetles?

Select the statements that describe characteristics of genes:
$(i)$ Genes are specific sequences of bases in a $DNA$ molecule.
$(ii)$ $A$ gene does not code for proteins.
$(iii)$ In individuals of a given species,a specific gene is located on a particular chromosome.
$(iv)$ Each chromosome has only one gene.

What is the $23^{rd}$ pair of chromosomes in humans called?

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?