Question

mendel was able to study seven traits in all the pea plants in each generation. which of his hypotheses allowed him to analyze each trait separately?
if two different alleles for a gene occur together, one of the alleles may be expressed while the other is hidden.
when gametes are formed, each gamete carries only one allele for the gene.
there are alternate versions of a alleles called genes.
for each inherited trait, there is only one copy of the gene that codes for that trait.

Explanation:

Mendel's law of segregation (when gametes are formed, each gamete carries only one allele for the gene) allows traits to be analyzed separately. This is because it ensures that each trait's alleles are passed on independently in gametes, enabling clear - cut analysis of individual traits generation - to - generation. The first option is about dominance, the third has a wrong statement (genes have alternate versions called alleles, not the other way around), and the fourth is incorrect as for each inherited trait in diploid organisms, there are two copies of the gene (except in gametes).

Answer:

When gametes are formed, each gamete carries only one allele for the gene.