Question

a specific genetic disorder is caused by nondisjunction. which statement describes how the genetic disorder occurs? a. a problem with rna replication leads to gametes with extra chromosomes b. a problem with chromosome separation leads to gametes with damaged chromosomes c. incomplete dna replication leads to gametes with half the usual number of chromosomes d. incomplete chromosome separation leads to gametes with an abnormal number of chromosomes

Explanation:

Nondisjunction is the failure of chromosomes to separate properly during cell - division. This results in gametes with an abnormal number of chromosomes. RNA replication issues (A) are not related to nondisjunction. Nondisjunction doesn't cause damaged chromosomes (B), and it's not due to incomplete DNA replication (C).

Answer:

D. Incomplete chromosome separation leads to gametes with an abnormal number of chromosomes.