Question

if a diploid cell undergoes meiosis but the homologous chromosomes fail to pull apart during anaphase i, what would not likely be the result when the gamete joins with another gamete in fertilization? a) polyploidy b) tetraploid zygote c) diploid zygote d) triploid zygote

Explanation:

Step1: Analyze Meiosis Error

In normal meiosis I, homologous chromosomes separate. If they fail to separate, the resulting gametes will have a diploid (2n) chromosome number instead of haploid (n).

Step2: Analyze Fertilization Outcomes

• If a diploid gamete (2n) fuses with a haploid gamete (n), the zygote will be triploid (3n) (Option D is possible).
• If a diploid gamete (2n) fuses with another diploid gamete (2n), the zygote will be tetraploid (4n) (Option B is possible), and this is a type of polyploidy (Option A is possible).
• A diploid zygote (2n) is formed when a haploid gamete (n) fuses with another haploid gamete (n). Since the error leads to non - haploid gametes, a diploid zygote from normal haploid - haploid fusion is not likely to result from this meiotic error.

Answer:

C) diploid zygote