Mendel believed that during the formation of gametes, the pair of genes controlling a trait separate. he called this the principle of dominance segregation separation recession

The correct answer for the blank is -

Principle of segregation.

Explanation:

According to the Mendel's Principle of segregation, during the process of gamete (sex cells) formation, the gene variant (also called alleles) for each gene become separated from one another so that one allele is present in each gamete.

These pair of genes (alleles) control the traits (characteristics of the individual such as eye color, hair color, skin color etc).

Thus, priniciple of segregation is the right answer.

1. a tropical dry forest carries out more rapid nutrient cycling

layer 3 is younger than layer 6.