biology

The unequal numbers of males and females and the bias investment to male or female offspring can both be explained by a process known as sexual selection. Sexual selection is the process by which individuals of one sex may choose their mates based on traits or characteristics that they possess. This can lead to males and females of different sizes, colors, patterns, and other traits. When parents bias investment to male or female offspring, they are likely attempting to increase the fitness of their offspring by making them more attractive mates or by helping them to survive and reproduce better than their competitors in the environment. This could lead to unequal numbers of males and females because parents may select to invest in either males or females, leading to a skewed population ratio.