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True or False Explain A chromosome in a primary human oocyte may synapse with any other chromosome in the same cell?
Wiki User
∙ 14y ago
Synapse occurs specifically between homologous pairs.
Homologous chromosomes are non-identical chromosomes that can pair (synapse) during meiosis. Except for the sex chromosomes, homologous chromosomes share significant sequence similarity across their entire length, typically contain the same sequence of genes, and pair up to allow for proper disjunction during meiosisWiki User
∙ 14y ago
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A primary oocyte is closely surrounded by flattened epithelial cells called?
follicular
What is the difference between ovum and secondary oocyte?
ovum is the product after the secondary oocyte fuses with sperm
Function of the polar bodies in oogenesis?
Although the polar bodies do not become anything they do serve a purpose in reproduction/oogenesis. The polar bodies are the byproducts of the primary and secondary oocyte at each point of meiotic division in oogenesis. The polar body allows for the oocyte to get rid of chromosomes while at the same time taking the least amount of resources (cytoplasm) from the oocyte. Each meiotic division serves as a means of moving the oocyte toward its need haploid number of chromosomes for fertilization. So you could say that the polar bodies function as a means of cellular structure conservation. They help ensure that the oocyte remains nutrient/resource rich while at the same time helping the oocyte reach its haploid number.
How many chromosome are in a male and female?
In the case of man the meiosis is otherwise known as spermatogenesis, as a result of which 4 haploid sperms are formed. The sperms differ from the other somatic cells not only in the no. of chromosomes but cytoplasm is also very much reduced. they have acrosomes, tail etc. After reduction division modification of the sperm cells occur which is otherwise known as spermiogenesis. In male the spermatogenesis occur after puberty but then onwards continuous.In the case of females it is known as oogenesis, as result they will be giving rise to only one ovary.(during the first and second meiotic division cell division is anisogamy and give unequal daughter cells in which the smaller ones released as polar bodies.) The ovary is rich in cytoplasm and have haploid no of chromosomes. In the case of human the first meiotic division of all possible primary oocyte takes place in the embryonic stage and second stage occur after puberty periodically one in a month
Describe the functions of the gonads?
Gonads are testes and ovaries. Testes produce spermatozoa by spermatogenesis and ovaries produce ova by oogenesis. Spermatozoa are produced via mitosis, producing diploid primary spermatocytes, then meiosis I which produces haploid secondary spermatocytes, which are converted to spermatids by meiosis II. Spermatids become spermatozoa. For the inchoate ovum, a diploid primary oocyte forms, followed meiotically by a haploid secondary oocyte. Ovulation occurs and the secondary oocyte only becomes a true ovum after syngamy. During the process, primary polar bodies become secondary polar bodies and are all rejected. Info from Raven, Johnson, Losos, Mason, Singer. Biology 8th Edition. (2008). McGraw Hill.
When a primary oocyte divides a secondary oocyte and what are produced?
polar body
What forms part of the primary follicle in the ovary?
A primary follicle consists of a primary oocyte surrounded by a single layer of enlarged cuboidal epithelium. Recall that previously, there was a primary oocyte in a primordial follicle surrounded by a thinner single layer of squamous follicular cells.
When the primary oocyte divides a secondary oocyte and what else is produced?
first polar body
What surrounds a primary oocyte?
follicle cells
Is the primary oocyte diploid?
92 In women, gametogenesis begins in fetal life, but is arrested in prophase of meiosis I for years until just before ovulation. This arrested oocyte is called the "primary oocyte". The human genome consists of 23 chromosomes, and normal somatic cells in humans have two of each chromosome (2N) in the resting state. Since the DNA in the primary oocyte has already replicated and but hasn't undergone division yet, the cell contains double the number of chromosomes of the original cell. Therefore the primary oocyte has 92 chromosomes (4N). Keep in mind though, that just before ovulation, the cell will complete meisois I and be released as 2N (the other 2N is split off as the 1st polar body). This released cell (secondary oocyte) which is now 2N is arrested in metaphase of meiosis II until fertilized, where it will release a second polar body (which now only has 1N). The fertilized egg therefore has two copies of chromosomes, 23 from mother (from the original 92 you started out with), and 23 from the sperm.
What does follicle stimulating hormone promote the development of?
primary follicle/oocyte
During oogenesis an oogonium directly gives rise to what?
A primary oocyte
What sex chromosome is found in human egg cell?
By human egg cell I guess you mean the oocyte (the one produced by the mother). The oocyte always carries the X chromosome, the sperm can either carry the Y or the X chromosome. Interestingly, the sperm which carries the Y is actually quicker than the one carrying the X, maybe because the X chromosome is far larger. So, if the Y chromosome sperm reaches the egg first, the child will be a boy (XY), and if the X chromosome sperm beats him to it, the child will be a girl (XX).
A primary oocyte is closely surrounded by flattened epithelial cells called?
follicular
Prenatal maturation of oocyte?
Primordial, secondary, tertiary, and antral are the basic steps in a developing oocyte
How many eggs are produced from one oocyte?
one cell is produced from one primary oocyte.
Difference between primary and secondary oocyte?
Any oogonia that has arrested itself in meiosis I prophase-dipotene on the onset of OMI (oocye maturation inhibition) hormone in the 3rd month of pregnancy and there after is a primary oocyte. On the urge of Leutinizing hormone which induces the pre-ovulatory phase, the primary oocyte completes meiosis I and arrests itself in meiosis II metaphase, which would only be completed if fertilization occurs, otherwise it will degenrate in 24 hours. On the completion of meiosis I, a SECONDARY oocyte and forst polar body is going to be formed.
