Which three student responses explain why meiosis contributes to genetic variation in populations of organisms?
A. Sex cells made by meiosis allow each parent to contribute only half of their genes.
B. Crossing over during meiosis mixes up the alleles more than they otherwise would.
C. Meiosis carefully sorts chromosomes so that the cells produced are genetically identical.
D. Meiosis assures that the number of chromosomes in body cells is reduced by half every generation.
E. Two sex cells made by meiosis combine, producing offspring with a different mix of genes than their parents have.
The three correct responses that explain why meiosis contributes to genetic variation are:
A. Sex cells made by meiosis allow each parent to contribute only half of their genes.
B. Crossing over during meiosis mixes up the alleles more than they otherwise would.
E. Two sex cells made by meiosis combine, producing offspring with a different mix of genes than their parents have.
Explanation:
– A highlights how meiosis reduces the genetic content in gametes, ensuring that offspring inherit a mix of genes from both parents.
– B refers to crossing over, a process where homologous chromosomes exchange segments, increasing genetic diversity.
– E emphasizes the combination of genes from two different parents, resulting in unique genetic combinations in offspring.
Responses C and D do not promote genetic variation; C states that meiosis produces genetically identical cells, and D focuses on chromosome number maintenance rather than variety. If you need further assistance, feel free to check the extended services page!