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Isolating mechanisms that take effect before or during fertilization are termed?
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∙ 15y ago
prezygotic
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∙ 15y ago
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What is a developing human known as during the first eight weeks after fertilization?
A developing human during the first eight weeks after fertilization is known as an embryo.
In which vertebrates is fertilization exclusively internal?
Fertilization is exclusively internal in most mammals and some reptiles, such as birds and most viviparous (live-bearing) species. In these species, sperm fertilizes the egg inside the female's body, before the zygote develops and the offspring are born alive.
What type of fertilization do toads have?
Toads have external fertilization. During mating, the male toad releases sperm onto the eggs as the female lays them.
Does mitosis happen before or after the zygote is formed?
The zygote results from the combination of gametes (sperm and egg) during fertilization. The zygote undergoes mitosis after this, so that it can divide and grow into an organism.
Do cats have Internal fertilization?
Yes, cats have internal fertilization. During mating, the male cat's penis transfers sperm into the female cat's reproductive tract, where fertilization of the eggs takes place.
Two species breeding at different times describes what isolating mechanisms?
Temporal isolation: Individuals do not mate because they are active at different times. This may be different times of the day or different seasons. The species mating periods may not match up. Individuals do not encounter one another during either their mating periods, or at all. Source:Wikipedia: Isolating mechanisms
What comes before fertilization in embryology?
Before fertilization in embryology, the egg and sperm undergo a process called gametogenesis where they mature, and then they are released from the ovaries and testes. Once released, they meet during fertilization to form a zygote.
Is meiosis necessary before fertilization Can occur?
Yes, meiosis is necessary before fertilization can occur because meiosis is the process by which gametes (eggs and sperm) are formed. During meiosis, the cell's chromosome number is halved, so that when the egg and sperm fuse during fertilization, the resulting zygote will have the correct number of chromosomes.
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
Why must meiosis occur before fertilization?
Meiosis is necessary before fertilization because it reduces the chromosome number by half in the gametes, ensuring that when the egg and sperm fuse during fertilization, the resulting zygote has the correct number of chromosomes. This process is essential for genetic diversity and the successful development of the offspring.
What unites during fertilization?
During fertilization the sperm unites with the egg. This typically occurs in the fallopian tube.
Is crossing over takes place in sperms before fertilization?
Crossing over occurs during fertilization. This is the mixing of alleles from each of the parents in order to make the offspring.
What is the chemical released by sperm during fertilization?
The chemical released by sperm during fertilization is an enzyme called acrosin. Acrosin helps the sperm penetrate the protective layer around the egg, facilitating fertilization.
Is fertilization possible during menstruation?
Not the least
What is a developing human known as during the first eight weeks after fertilization?
A developing human during the first eight weeks after fertilization is known as an embryo.
Can fertilization happen during pregnancy?
No, there is no ovulation when pregnant.
During which stage of the general troubleshooting process should you identify characteristics of problems?
Isolating the problem
