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 states that when gametes are formed, each gamete carries only one allele for the gene. This allows for the analysis of each trait separately as it ensures that alleles for different traits are inherited independently. The first option is about dominance, the third option has incorrect terminology (genes have alleles, not the other way around), and the fourth option is wrong as for each inherited trait in diploid organisms like pea plants, there are two copies of the gene (except in gametes).

Answer:

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