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Only one sperm can fertilize an egg (excluding abnormal circumstances), however the chances of one sperm alone fertilizing an egg is extremely low.
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What mosquito housefly eagle turtle and dog undergo internal-external fertilization?
External fertilization occurs when sperm and eggs unite in the open, rather than within specialized organs during internal fertilization. Turtles, eagles, and dogs most definitely undergo internal fertilization. Mosquitoes and houseflies, on the other hand, undergo external fertilization.
How does the human fertilization process work?
Human fertilization is a complex process that involves several steps: Ejacu**** and Ovulation: The most common sequence begins with ejaculat** during copulation, followed by ovulation. Sperm Journey: After ejacula****, sperm begin their journey inside the female reproductive tract until they reach the Fallopian tubes, where the egg cell is located. Out of the millions of sperm released during ejacula****, just about two hundred are able to hit the egg cell in the Fallopian tube. Penetration of the Corona Radiata: The first stage of human fertilization is the penetration of spermatozoa into the corona radiata of the egg, a coat made of cells that surrounds the egg. Sperm cells are able to go through this first barrier thanks to the release of the hyaluronidase enzyme, and the motion of their flagellum (the tail). Penetration of the Zona Pellucida: More than a single sperm cell is required to degrade the ZP. Nonetheless, in the end, only one sperm will penetrate this layer. Fusion of Membranes: The sperm plasma then fuses with the egg’s plasma membrane and their nuclei fuse1. This triggers the sperm head to disconnect from its flagellum as the egg travels down the fallopian tube to reach the uterus. Formation of Zygote: The result of this union leads to the production of a fertilized egg called a zygote, initiating embryonic development. This process can also occur outside of the body through methods like in vitro fertilization.
What is somatic variation?
Mutations that occur in the somatic cells are called somatic variations .New mutations occur twice as frequently in sperm as in eggs(germ cells), probably because so many more cell divisions are required to make sperm than eggs.
Can the number of chromosomes in a reproductive cell be greater than the number chromosomes in an organism's body cell?
No. The reproductive cells (eggs, sperm, ova and pollen) all contain half the number of chromosomes of an organisms body cell. This means that at fertilization the two reproductive cells (or gametes) combine to form a single cell with the appropriate number of chromosomes.If a gamete had more chromosomes than a normal cell then fertilization would lead to even more chromosomes and an offspring that would be seriously genetically compromised.
Does sperm cell contain a nucleus?
Yes, they do. During fertilization, the nucleus of the sperm and ova fuse to form a complete cell. Remember, the chromosome number in a sperm cell or ovum is half the normal number, or haploid.
Why are there more egg and sperm cells produced during external fertilization than during internal fertilization?
Why are there generally more eggs and sperm cells produce during external fertilization thean internal fertilization
How is fertilization of a single egg by more than 1 sperm prevented?
The face that sperm cannot live long, and only one sperm can fertilize egg at one time.
What is the name of merging one sperm and one egg?
The term for the joining of an egg and a sperm is fertilization.
Why is internal fertilization considered more advantageous than external fertilization?
Internal fertilization is considered more advantageous than external fertilization for various reasons. The unborn baby is protected in the internal fertilization from any external threats.
Which of internal and external fertilization is more efficient?
Internal since it limits the space in which the sperm and egg are found in. Fewer eggsare produced by the female conserving raw materials and energy. The male still produces a tremendous amount of sperm but it is less than what is wasted in external fertilization. The offspring are afforded more protection by the mother so fewer are produced
Why does organisms that use internal fertilization produces less offspring than the ones that use external fertilization?
Because internal fertilization requires a womb and placenta to protect and nourish the growing embryos - which limits the number of offspring the mother can produce. Laying eggs outside the body means the female can potentially produce many more off-spring, and thus vastly increase the chances of the species survival.
How do fertility enhance the opportunity for fertilization of an egg?
Fertility increases the production of eggs, and if the fertility in a woman is higher, than there is a higher chance of an egg getting hit by a sperm cell, as there will be more of them.
Why in animal fertilization are there generally more egg and sperm cell produced during external fertilization than during internal fertilization?
I'm no expert, but I'm fairly sure that the environmental conditions (ie. air temp) makes quite a big difference
Implantation of a zygote into endometrium?
Endometrium is the lining of the uterous, they are talking about fertilization, or more than likely fertilization with the help of a clinic, and doctor. The zygote is what the egg is after it has been fertilized and the two hapliod cells or egg and sperm becom diploid cells and now have a whole DNA or genetic code.
What mosquito housefly eagle turtle and dog undergo internal-external fertilization?
External fertilization occurs when sperm and eggs unite in the open, rather than within specialized organs during internal fertilization. Turtles, eagles, and dogs most definitely undergo internal fertilization. Mosquitoes and houseflies, on the other hand, undergo external fertilization.
What are the similarities of internal external fertilization?
Internal fertilization takes place inside the body of the female. It is necessary for animals which live on land (terrestrial animals) and is retained by aquatic animals descended form terrestrial ancestors eg whales and dolphins. External fertilization takes place outside the body of the female. It usually takes place in water, usually the environment in which the animal lives eg fish and amphibians. This is because eggs and sperm would dry out and die if they are not kept wet. Internal fertilization is more certain than external fertilization so fewer eggs need to be produced. After internal fertilization eggs can be protected and fed while developing inside the mother's body. After external fertilization the eggs are potentially exposed to predators and so must either be produced in very large numbers or protected by the parents or both.
Is there another way to get pregnant?
Other than traditional intercourse, you can get pregnant by invitro fertilization, where a doctor would mix sperm and eggs and place them inside the uterus or by inserting sperm into the woman's vagina via another method.
