Why must a gamete carry one allele from each gene

I don't know how to word it, but basically each gamete contains one allele of each gene, and each gene pair must separate into different gamete cells so yea.

Explanation:

"Each parent passes an allele at random to their offspring resulting in a diploid organism. The allele that contains the dominant trait determines the phenotype of the offspring. In essence, the law states that copies of genes separate or segregate so that each gamete receives only one allele."

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.