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At fertilization, one sperm enters the egg cell (2 cells) and in short while the egg nucleus and sperm nucleus merge to form one cell, called a zygote. The sperm and the egg each had 23 chromosomes, together the new cell has 46.
Over the next few days the zygote divides (mitosis) without growing. Around day 4 after fertilization a morula forms - a solid ball of 16 or more cells. Later on, a blastocyst forms (a hollow ball of 70 to 100 cells) composed of an inner and an outer layer. The outer layer secretes hCG (human chorionic gonadotropin). This hormone causes the initial symptoms of pregnancy (nausea, etc). It is also excreted in the urine, and pregnancy tests test for this hormone (which is only created during pregnancy).
Technically, only when the zygote attaches to the uterine wall is it an embryo. This is called implantation, and it usually occurs 6-7 days after fertilization. The embryonic stage lasts from week 2 to week 8 after fertilization.
Wiki User
∙ 12y ago
Wiki User
∙ 12y agousually it will have 46, 23 from your father, and 23 of your mother. However, mistakes can always be made, in Klinefelter's syndrome, you have an extra X-chromosone, and in Down syndrome, also known as trisomy 21, you have 3 chromosomes instead of 2 at pair 21.
Wiki User
∙ 9y ago23 pairs of chromosomes in each cell. Same like adults have got.
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How many chromosomes are present in a sperm cell before fertilization and in the zygote after fertilization?
There are 22 in each, along with an X sex chromosome for the female form and a Y sex chromosome for the male form.
How many chromosomes are present in human haploid and diploid cells?
human diploid numbers are 46 chromosomes (the total amount of chromosomes) and the haploid number is 23 (half the number of chromosomes) in meiosis the desired number is the haploid number for gametes (sex cells) and it becomes the diploid number after fertilization and for mitosis its the diploid number because it wants to maintain its chromosomes since its not sexual reproduction
How many pairs of chromosomes found in a gametes?
In human gametes, chromosomes are not paired. Instead, each gamete has one set of 23 chromosomes, and is said to be haploid.
How many chromosomes are contained in a human male gamete cell?
In a gamete (sex) cell, there are 23 chromosomes. A gamete is a haploid, or n, whereas a somatic (normal) cell is a diploid, or 2n, and has 46 chromosomes.
How many pairs of chromosomes does a human have in all their body cells?
There are 23 pairs or 46 individual chromosomes in a humans cells. 22 pairs of autosomes and 1 pair of sex chromosomes in normal humans. (There are disorders such as Turners syndrome and Klinefelter syndrome that result in different numbers of chromosomes.)
How many chromosomes are found in human egg and sperm cell?
There are 23 chromosomes in each the sperm and the egg. When they fuse, the resulting embryo will have 46 chromosomes.
How many chromosomes does a human sperm or egg cell contain?
The human egg or sperm cell is haploid and contains 23 chromosomes. After fertilization (egg and sperm fusion), the zygote will have 46 chromosomes (23 pairs).
How many chromosomes does a human have.?
Every normal human cell has 46 chromosomes (23 pairs), so every human gamete has 23 chromosomes. Rarely, a human cell might have an extra chromosomes and that some times causes the death of the embryo or a deformity like Down's.
How many sex chromosomes does a sperm carry?
Each parent donates 23 chromosomes to fertilization process however only the male can determin the sex.
How many chromosomes does a embryo have after mitosis?
one.
How many chromosomes do a fertilized egg of a human have?
After fertilization all normal human cells contain the same number of chromosomes as the cells of an adult human - 23 pairs of chromosomes, for a total of 46 chromosomes. Before fertilization the ovum contains only 23 chromosomes. A second 23 chromosomes are provided by the sperm during fertilization.
If a sex cell has eight chromosomes how many chromosomes will there be after fertilization?
in a normal human cell there are 46 chromosomes but sex cells only have half these (23) because when the female sex cell and the male sex cell come together and fertilise they add up to 46 (making a human cell which will multiply into a baby human) In your questions state you are only using 8 so a normal cell would have double that (16) to make a baby of that species of animal or plant ect.
Hom many chromosomes does each human cell have?
There are 46 chromosomes in each cell. However, there are 23 in a sex cell e.g. 23 in an egg cell, 23 in a sperm cell to form 46 chromosomes for a embryo to develop.
How many chromosomes does a sperm cell have prior to fertilization?
23
How many nuclei are used in fertilization?
2. 46 chromosomes.
How many days does it take for an embryo to implant in the uterus?
7 days from fertilization.
How many chromosomes will thee be after fertilization?
well since I'm a major in biology and i have directed many things, i have found out that there will only be 21 after fertilization. See, chromosomes will start separating and a few will go to the fertilization process. that is how there is less than they usually have.
