Question

place these events in the correct order as they create gene variety during reproduction. (2 points) unique mixes of genes are passed to the new cell at fertilization. dna copying makes copies of the genetic material before cell division. matching chromosomes pair up and exchange dna pieces during crossing - over. chromosomes fail to separate properly during nondisjunction, an error in meiosis.

Explanation:

To determine the order, we analyze the processes of gene variety in reproduction:

1. DNA copying (replication) occurs first to prepare genetic material for cell division (meiosis or mitosis, but here for reproduction, meiosis is key).
2. Crossing - over happens during prophase I of meiosis, where homologous chromosomes pair and exchange DNA, increasing genetic diversity.
3. Nondisjunction is an error during meiosis (anaphase I or II) that can create abnormal chromosome numbers, contributing to genetic variation.
4. Fertilization combines unique gametes (with varied genes from crossing - over, nondisjunction, etc.) to form a new cell with a unique gene mix.

Answer:

1. DNA copying makes copies of the genetic material before cell division.
2. Matching chromosomes pair up and exchange DNA pieces during crossing - over.
3. Chromosomes fail to separate properly during nondisjunction, an error in meiosis.
4. Unique mixes of genes are passed to the new cell at fertilization.