Bio 212 Final questions with complete solutions

Fertilization Correct Answer-joining of a sperm and an egg to form a diploid zygote Organisms that use external fertilization Correct Answer-most animals who participate in this live in aquatic environments like tadpoles -tend to produce large number of gametes How are gametes released for external fertilization Correct Answer--gametogenesis occurs in response to environmental cues( lengthening days and warmer water temperatures) that indicate a favorable season for breeding -gametes are released in response to specific cues from individuals of the same species What draws sea urchin sperm to the egg Correct Answer-follow a gradient of a chemical secreted by the egg's jelly layer Describe the process of sea urchin sperm and egg interaction Correct Answer-1. Sperm is drawn in by the chemical gradient from the egg's jelly layer 2. head of sperm initially binds to the jelly layer that surrounds the egg cell 3. Binding triggers the acrosome reaction or the release of the sperm's acrosome