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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 are 4 ways variation is introduced during meiosis?
Variation during meiosis is introduced through several mechanisms: Crossing Over: During prophase I, homologous chromosomes exchange genetic material, creating new allele combinations. Independent Assortment: During metaphase I, the random orientation of chromosome pairs leads to different combinations of maternal and paternal chromosomes in the gametes. Random Fertilization: The fusion of any two gametes (each with unique genetic material) during fertilization increases genetic diversity. Mutation: Spontaneous mutations can occur during DNA replication, introducing new alleles into the gene pool.
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.
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.
Can fertilization occur anytime during a menstrual cycle?
Fertilization can only occur during a specific window around ovulation, which typically happens approximately 14 days before the start of the next menstrual period. Sperm can survive in a woman's reproductive tract for up to five days, so if intercourse occurs in the days leading up to ovulation, fertilization is possible. However, outside of this fertile window, the chances of fertilization are significantly lower.
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.
Which gender's sperm, male or female, moves faster during fertilization?
Male sperm typically moves faster during fertilization compared to female sperm.
