Question

which of the following can occur because of the exchange of homologous chromosome parts during the process of meiosis?
○ decreased gamete number
○ offspring with unique combinations of traits
○ random mutations
○ decreased number of alleles on each chromosome

Explanation:

During meiosis, crossing - over (exchange of homologous chromosome parts) leads to genetic recombination. This recombination results in new combinations of alleles. When gametes are formed and fertilization occurs, the offspring inherit these new allele combinations, giving them unique trait combinations.

• Decreased gamete number is not a result of crossing - over. Gamete number is more related to the overall meiotic process (e.g., non - disjunction can affect chromosome number in gametes, but not the number of gametes in a general sense due to crossing - over).
• Random mutations are not caused by the exchange of homologous chromosome parts. Mutations are changes in the DNA sequence that can occur due to various factors like radiation, chemicals, etc., not due to the normal process of crossing - over during meiosis.
• The number of alleles on each chromosome is not decreased. Crossing - over can lead to new combinations of alleles on chromosomes, but it does not decrease the number of alleles.

Answer:

offspring with unique combinations of traits