Question

22 multiple choice 2 points base your answer on the diagram of paired homologous chromosomes shown and on your knowledge of biology. the genetic disorder shown in the diagram most likely resulted from polyploidy nondisjunction crossing - over segregation

Explanation:

Polypoidy refers to having extra sets of chromosomes. Nondisjunction is the failure of chromosomes to separate properly during cell - division, which can lead to an abnormal number of chromosomes in daughter cells. Crossing - over is the exchange of genetic material between homologous chromosomes during meiosis. Segregation is the separation of alleles during gamete formation. In the diagram, there is an extra chromosome 21, which is a result of nondisjunction during meiosis of the gametes that formed the individual.

Answer:

B. nondisjunction