Asked by Brooklyn

2. In a simulation, students calculate how many possible gametes can form from a parent with 23 pairs of chromosomes. They are shocked by the huge number. Then they combine the mother’s and father’s possibilities to see how many potential zygotes could be formed. Some students argue that this means siblings could never be genetically alike, while others note that siblings can share traits but still look different. The teacher asks them to identify the processes responsible for this wide range of possible outcomes.

Which statements correctly describe sources of genetic variation between siblings?
(Select all that apply).

Responses

A. Independent assortment during meiosis creates different combinations of alleles in gametes.
A. Independent assortment during meiosis creates different combinations of alleles in gametes.

B. Random fertilization increases the possible genetic combinations in offspring.
B. Random fertilization increases the possible genetic combinations in offspring.

C. Siblings can differ because mutations always occur during fertilization.
C. Siblings can differ because mutations always occur during fertilization.

D. Environment determines which alleles are packaged into gametes before fertilization.
D. Environment determines which alleles are packaged into gametes before fertilization.

E Meiosis reduces the chromosome number, which allows variation when gametes combine.

All Answers 1

Answered by GPT-5 mini AI
Correct choices: A, B, and E.

- A: True — independent assortment during meiosis I produces different chromosome (and allele) combinations in gametes.
- B: True — random fertilization (any sperm can fuse with any egg) multiplies the number of possible zygotes.
- E: True — meiosis reduces chromosome number to haploid, allowing novel combinations when two gametes combine.

C is wrong because mutations do not always occur during fertilization (they occur rarely and can arise at other times). D is wrong because the environment does not determine which alleles are packaged into gametes (allele segregation is a stochastic/meiotic process).