Which Event Takes Place During Normal Fertilization? - Fixanswer

What is the role of HCG (human chorionic gonadotrophin) in early pregnancy? A.

It stimulates the release of FSH (follicle stimulating hormone)

.

What prevents Polyspermy ?

To prevent polyspermy,

the zona pellucida, a structure

that surrounds mammalian eggs, becomes impermeable upon fertilization, preventing the entry of further sperm. The structural changes in the zona upon fertilization are driven by the exocytosis of cortical granules.

What are the 4 steps of fertilization?

asymmetric and motile sperm cell and a large and nonmotile egg. The stages of fertilization can be divided into four processes: 1) sperm preparation, 2) sperm-egg recognition and binding, 3) sperm-egg fusion and 4) fusion of sperm and egg pronuclei and activation of the zygote.

What are the 6 steps of fertilization?

Sperm Capacitation.
Sperm-Zona Pellucida Binding.
The Acrosome Reaction.
Penetration of the Zona Pellucida.
Sperm-Oocyte Binding.
Egg Activation and the Cortical Reaction.
The Zona Reaction.
Post-fertilization Events.

How do you know if fertilization has taken place?

Some women do notice signs and symptoms that implantation has occurred. Signs may include

light bleeding, cramping, nausea, bloating, sore breasts, headaches, mood swings

, and possibly a change in basal body temperature.

Where does a sperm generally fertilize an egg?

A pregnancy starts with fertilization, when a woman’s egg joins with a man’s sperm. Fertilization usually takes place in

a fallopian tube

that links an ovary to the uterus.

Where does fertilization most often occur?

Fertilization usually takes place in

a fallopian tube that links an ovary to the uterus

. If the fertilized egg successfully travels down the fallopian tube and implants in the uterus, an embryo starts growing.

What follows immediately after fertilization occurs?

Once fertilized, the egg travels down the fallopian tube toward

the womb

, or uterus, where it will implant in the uterine wall. Doctors refer to the fertilized egg as an embryo after implantation. Beginning in the ninth week of pregnancy, and until the pregnancy ends, doctors call the developing baby a fetus.

Why is human chorionic gonadotropin hCG important early in pregnancy?

Human chorionic gonadotrophin is the embryonic hormone that

ensures the corpus luteum continues to produce progesterone throughout the first trimester of pregnancy

.

Why are the first 3 months of a pregnancy the most important developmentally?

The first trimester is the most crucial to your baby’s development. During this period,

your baby’s body structure and organ systems develop

. Most miscarriages and birth defects occur during this period.

What happens if Polyspermy occurs?

In biology, polyspermy describes

an egg that has been fertilized by more than one sperm

. … The cell resulting from polyspermy, on the other hand, contains three or more copies of each chromosome—one from the egg and one each from multiple sperm. Usually, the result is an unviable zygote.

How is Polyspermy prevented quizlet?

Polyspermy is the double fertilization of an ovum by two sperm. It is prevented by 3 methods during

fertilization

: 1) The intracellular wave of Ca2+ that travels across the oocyte membrane and causes hyper polarization after fusion of the sperm and oocyte membranes. … This forms a barrier to outside sperm.

What is a difference between human sperm and human egg cells?

Difference Between Ovum and Sperm (Human)	Sperm Ovum	Sperm is the male gamete Ovum is the female gamete	Motility	Motile (flagella) Non-motile