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Does sexual life cycles differ with respect to the relative timing of meiosis and fertilization?
Wiki User
∙ 11y ago
Yes.
Wiki User
∙ 11y ago
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How does the alternation of meiosis and fertilization in the life cycles of sexually reproducing organisms maintain the normal chromosome count for each species?
Simple, Meiosis reduce the chromosome number in half while fertilization doubles the chromosome number. n=chromosome number Meiosis = 2n (primordial germ cells) ----> n (sperm cell/egg cell/polar bodies) Fertilization = sperm (n) + egg (n) ----> 2n (zygote)
How does the fertilization affect the menstrual cycle?
Fertilization would be when conception occurs, if the fertilized egg implants itself in the uterus lining this is when pregnancy occurs and thus the menstrual cycles stop. Although fertilization doesn't always result in pregnancy, and pregnancy can miscarry at any point.
What are the 3 types of biogeochemical cycles?
WaterNitrogencarbon dioxide
What are the end results of mitosis and meiosis?
1) Mitosis occurs in body cells and produces two diploid (2n) daughter cells that are genetically identical for growth and repair. Meiosis occurs in the gonads and produces four haploid (n) daughter cells that are genetically unique for reproduction. 2) Meiosis requires two cycles to halve the chromosome number.. The first cell division of meiosis called meiosis I is similar to mitosis.. The second cell division halves the chromosome number from 2n to n.. This is required to produce gametes (cells with n number of chromosomes - sperm or ova) so that when the gametes join together during fertilization they produce a zygote that is 2n. 3) Crossing over during meiosis increases the genetic variation of the gametes and thus the next generation.. Crossing over occurs in prophase I of meiosis when homologous chromosomes pair up in tetrads and non-sister chromatids swap pieces of DNA.. This creates unique chromosomes.. Variation is also increased by the independent assortment of chromosomes during meiosis (a gamete can receive the paternal chromosome or maternal chromosome for each chromosome) and random fertilization (any sperm can fertilize any egg).. (Sources: Yahoo!)
Why is meiosis sometimes called reduction division?
Due to the fact that meiosis consists of two "phases" or cycles and goes from a diploid state (2n) to a haploid state (n) it is often times referred to as reduction division. This is because the parent cell starts off with two sets of chromosomes and the daughter cells only end up with one set of chromosomes when the entire process is complete.
How does the alternation of meiosis and fertilization in the life cycles of sexually reproducing organisms maintain the normal chromosome count for each species?
Simple, Meiosis reduce the chromosome number in half while fertilization doubles the chromosome number. n=chromosome number Meiosis = 2n (primordial germ cells) ----> n (sperm cell/egg cell/polar bodies) Fertilization = sperm (n) + egg (n) ----> 2n (zygote)
Plant life cycles differ from animal life cycles in that?
spore formation occurs in between meiosis and gamete formation.
How would you describe the process of miosis?
There is two cycles to the process of meiosis. The cycles are involving a gamete mother cell and dividing them into fourths.
Which of the following occurs in meiosis but not mitosis?
Meiosis is the division of the gametes(sex cells), haploid (n) Mitosis is cell division, diploid (2n) In meiosis, there are the similar cycles (prophase, metaphase, anaphase, and telophase), but there are two cycles of each (ex: prophase 1, prophase 2 ETC).
What do the life cycle of all living things have in common?
The life cycle of all living things have a beginning and an end (aka life and death) All three life cycles (animal, plants/algae and fungi) have these three key features: fertilization, undergoes mitosis and meiosis.
When fertilization take place?
fertilization takes place when the sperm came in hahahaha :P seriously it's true Most woman are able to becomke pregnant from puberty,when their menstrual cycles begin ,until menopause,when their cycles stop. A pregnancy starts with fertilization ,when a woman's egg join with the man's sperm .fertilization usually takes place in the fallopian tube and implants in the uterus an embryo starts growing.
How does the fertilization affect the menstrual cycle?
Fertilization would be when conception occurs, if the fertilized egg implants itself in the uterus lining this is when pregnancy occurs and thus the menstrual cycles stop. Although fertilization doesn't always result in pregnancy, and pregnancy can miscarry at any point.
How many cell divisions are in meiosis?
There are two parts to meiosis; a meiosis I and a meiosis II. Meiosis I: Interphase Prophase I Metaphase I Anaphase I Telophase I Cytokenisis I Meiosis II: *THERE IS NO INTERPHASE II!!* Prophase II Metaphase II Anaphase II Telophase II Cytokenisis II
What are the seasons and cycles of an international space station?
Winter, Spring, Sumer and Autumn. The cycles are bicycles and motorcycles, but these are generally not used, due to their relative uselessness in low gravity.
What are the 3 types of biogeochemical cycles?
WaterNitrogencarbon dioxide
When does fertillization take place?
fertilization takes place when the sperm came in hahahaha :P seriously it's true Most woman are able to becomke pregnant from puberty,when their menstrual cycles begin ,until menopause,when their cycles stop. A pregnancy starts with fertilization ,when a woman's egg join with the man's sperm .fertilization usually takes place in the fallopian tube and implants in the uterus an embryo starts growing.
What are the end results of mitosis and meiosis?
1) Mitosis occurs in body cells and produces two diploid (2n) daughter cells that are genetically identical for growth and repair. Meiosis occurs in the gonads and produces four haploid (n) daughter cells that are genetically unique for reproduction. 2) Meiosis requires two cycles to halve the chromosome number.. The first cell division of meiosis called meiosis I is similar to mitosis.. The second cell division halves the chromosome number from 2n to n.. This is required to produce gametes (cells with n number of chromosomes - sperm or ova) so that when the gametes join together during fertilization they produce a zygote that is 2n. 3) Crossing over during meiosis increases the genetic variation of the gametes and thus the next generation.. Crossing over occurs in prophase I of meiosis when homologous chromosomes pair up in tetrads and non-sister chromatids swap pieces of DNA.. This creates unique chromosomes.. Variation is also increased by the independent assortment of chromosomes during meiosis (a gamete can receive the paternal chromosome or maternal chromosome for each chromosome) and random fertilization (any sperm can fertilize any egg).. (Sources: Yahoo!)
