Question

arrange the following events in the proper order in which they occur during meiosis i. a. separation of homologous chromosomes b. synapsis c. crossing-over d. independent assortment

Answer 1

During Meiosis I, the events occur in this order: synapsis, crossing-over, independent assortment, and then the separation of homologous chromosomes.

Step-by-step explanation:

The events of Meiosis I occur in a specific order to ensure the correct segregation and genetic variation of gametes. The proper sequence of the events listed is as follows:

1. Synapsis: This occurs during prophase I, where homologous chromosomes pair up closely to form a structure known as a synaptonemal complex.
2. Crossing-over: Still in prophase I, the exchange of genetic material between homologous chromosomes happens. This is seen as chiasmata under a microscope and contributes to genetic variation.
3. Independent Assortment: As homologous chromosomes line up at the equator during metaphase I, they are arranged randomly, which influences the combination of chromosomes that go into the gametes.
4. Separation of Homologous Chromosomes: During anaphase I, the homologous chromosomes are pulled apart to opposite poles of the cell.