DB Chapter 6: Fertilization an der Hochschule Bonn-Rhein-Sieg | Karteikarten & Zusammenfassungen

Lernmaterialien für DB Chapter 6: Fertilization an der Hochschule Bonn-Rhein-Sieg

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What is the requirement of gametes for fertilization?

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They have to reduce their genetic material by half: from diploid to haploid

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What is the process called, where diploid cells become haploid?

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Meiosis

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Meiosis is the process by which one diploid eukaryotic cell devides to generate ____ haploid cells. 

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4

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At the time of fertilization, the egg has a __________ pronucleus

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haploid 

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What is the zona pellucida?

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A glycoprotein matrix that surround the egg. 

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The binding of sperms to the zona pellucida has some species-specificity.

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Right. 

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Which kind of enzymes do acrosomal enzymes mainly consist of? 

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Mainly proteases

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What is the difference between the egg and sperm fusion of sea urchins and mammals?

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Sea urchin sperm binds to the microvilli of the egg with the acrosomal process, while sperm of mammals bind with the equatorial domain.

Both are then fused and internalised. 

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At the time of fertilization the egg is arrested in the __________ of the second mitotic division.

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Metaphase

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What leads to completion of meiosis and formation of the female pronucleus?

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Calcium waves

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What happens with the membrane potential shortly after fertilization? What causes this and why is it important?

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Shortly after fertilization, the membrane potential shifts from -70 mV to +20 mV


The potential shift is due to Na+ influx and prevents entrance of more sperms.

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What happens in fertilization generally? 

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Sperm and egg (gametes) fuse to form a zygote whose genome is derived from both parents. 

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Q:

What is the requirement of gametes for fertilization?

A:

They have to reduce their genetic material by half: from diploid to haploid

Q:

What is the process called, where diploid cells become haploid?

A:

Meiosis

Q:

Meiosis is the process by which one diploid eukaryotic cell devides to generate ____ haploid cells. 

A:

4

Q:

At the time of fertilization, the egg has a __________ pronucleus

A:

haploid 

Q:

What is the zona pellucida?

A:

A glycoprotein matrix that surround the egg. 

Mehr Karteikarten anzeigen
Q:

The binding of sperms to the zona pellucida has some species-specificity.

A:

Right. 

Q:

Which kind of enzymes do acrosomal enzymes mainly consist of? 

A:

Mainly proteases

Q:

What is the difference between the egg and sperm fusion of sea urchins and mammals?

A:

Sea urchin sperm binds to the microvilli of the egg with the acrosomal process, while sperm of mammals bind with the equatorial domain.

Both are then fused and internalised. 

Q:

At the time of fertilization the egg is arrested in the __________ of the second mitotic division.

A:

Metaphase

Q:

What leads to completion of meiosis and formation of the female pronucleus?

A:

Calcium waves

Q:

What happens with the membrane potential shortly after fertilization? What causes this and why is it important?

A:

Shortly after fertilization, the membrane potential shifts from -70 mV to +20 mV


The potential shift is due to Na+ influx and prevents entrance of more sperms.

Q:

What happens in fertilization generally? 

A:

Sperm and egg (gametes) fuse to form a zygote whose genome is derived from both parents. 

DB Chapter 6: Fertilization

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