Embryogenesis & Development

Question 1

The sperm uses acrosomal enzymes to penetrate which 2 parts of the oocyte?

Answer 1

1. Corona radiata

2. Zona pellucida

Question 2

Upon contact with the plasma membrane of the oocyte, sperm establish _____ to inject its nucleus?

Hint: 2 words

Answer 2

Acrosomal apparatus

Question 3

What is the name of the reaction when a sperm successfully penetrates the oocyte?

Answer 3

Cortical Reaction

Question 4

During the cortical reaction (in fertilization), calcium ions depolarize the membrane of the ovum, which serves 2 purposes:

Answer 4

1. Depolarization prevents fertilization of ovum by multiple sperm cells
2. Increased Ca+ concentrations increases metabolic rate of newly formed diploid zygote

Question 5

Fertilization of an oocyte takes place in which part of the fallopian tube?

Answer 5

Ampulla

Note: this is the widest part of the fallopian tube