Fertilization Steps

Question 1

1. After _ hours, sperm meets egg

Answer 1

17

Question 2

1. Tip of sperm, aka _ , makes contact with egg

Answer 2

Acrosome

Question 3

2. Egg’s coat _

Answer 3

Breaks down

Question 4

2. Sperm’s tip ruptures and releases enzymes that break through _

Answer 4

Zona pellucida (egg’s coat)

Question 5

3. After breaking through zona pellucida, sperm reaches _

Answer 5

Outer membrane of egg

Question 6

3. At outer membrane, sperm bind to protein receptors that _

Answer 6

Recognize it as a sex cell

Question 7

Sperm head carries _

Answer 7

Proteins

Question 8

4. Outer membrane of sperm and egg fuse together so _

Answer 8

Contents can mingle

Question 9

5. Sperm nucleus enters cytoplasm of egg and eventually fuses with egg nucleus, creating

Answer 9

The cell into a diploid zygote

Question 10

6. Once sex cells have converted, _ fuse with outer membrane

Answer 10

Granules in eggs cytoplasm

Question 11

When granules on eggs cytoplasm fuse with outer membrane it changes _

Answer 11

It’s outer receptors

Question 12

After zygote formed, granules fuse with membrane, blocking _

Answer 12

Entry to other sperm