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You may mean post zygotic isolation/barrier to interbreeding between species. Sterile hybrids, such as mules are a good example of this. The zygote can form from the union of two gametes, but the mature organisms can no longer produce progeny usually due to chromosome mismatch.
Polly Nitzsche
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How is prophase1 different in meiosis than in mitosis?
on prophase of mitosis the cylindrical shaped structure(centrioles) starts to move going to the both opposites sides as they move the fiber make-up structure starts to form(spindle). The spindles is the one who controls the movement of the choromosomes while it is in the process. note the chromosomes starts to become shorten ad thick that's why they r very easy to see. in prophase I of meiosis the choromoses condense and are seen to have splitinto two chromatids. One of its important features of the phrophase I of meiosis the paternal and maternal chromosomes come together in homologous pairs., well that's my answer i know its ryt... hope that i have helped you. -joan- The answer by joan simply states the processes that occur individually by mitosis and meiosis. The question is to discuss the 'Difference' instead of state the events that occur. In my understanding, prophase 1 of meiosis consists of 5 different stages - Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis. Now the question is which of these 5 stages differ from prophase of mitosis. I found that stages Leptotene (condensation of DNA) and Diakinesis (nuclear envelop fragments) are similar to that in prophase of mitosis. Thus, the difference has to lie in stages Zygotene (formation of bivalents and synaptonemal complex), Pachytene (crossing over at sites called chiasma) and Diplotene (separation of synaptonemal complex). Do improve on my answer. glenn
Is homologous chromosomes only present in cells that undergo meiosis?
Usually they dont as homologous chromosomes form bivalents with other homologous chromosomes and crossing over occurs between the 2. But if a chiasmata does form between the t homologous chromosomes they can change information.
Where do homologous chromosomes pair and form synapses?
The most common form of synapsis occurs in the nuclei of cells undergoing the type of cell division called meiosis.It occurs during prophase I (i.e. prophase of the first meiotic division). Prophase I is subdivided into five stages, and synapsis occurs in the second of these (zygotene).Synapsis refers to the pairing of homologous chromosomes. For example, the chromosome 5 that you inherited from your mother pairs with the chromosome 5 that you inherited from your Dad. By "pairing" is meant the exact alignment of two chromosomes, so that each point (locus) on one chromosome is beside the corresponding point on the other.It does not only occur during meiosis. Some flies, including the intensively-studied fruit-fly Drosophila, can undergo endomitosis, which is the division of chromosomes without subsequent cytokinesis (splitting of the cytoplasm).The result? A considerable replication of chromosomal material within a single cell. A famous example is the giant (polytene) chromosomes of the salivary glands of Drosophila. In these giant chromosomes the genetic material is aligned, so this is another example of synapsis.
What are the five phases of meiosis 1?
Meiosis.....................produces gametes or sexual cells, which contain half the chromosomesbecause the sexual union of male and female will contribute the otherhalf.
What is the process of meiosis 2?
Mitosis is the type of cell division in which cell a diploid somatic cell divides in such a way that the no. of chromosomes in the daughter cell remains constant as in parent cell nucleus. In mitosis, the nuclear chromatin first appears as long threads which shorten and thicken to form the typical number of chromosomes. Each chromosome splits lengthwise to double in number, with half of each set then moving toward opposite poles of the cell to become reorganized into two new nuclei having the normal number of chromosomes. Mitosis results in creating two cells that are genetically identical. It is vital for growth and the repair and replacement of cells, replacing old skin cells for example.
What major chromosomal event occurs between leptonema and zygonema?
After condensing into long strands in the nucleus during Leptotene/Leptonema Chromosomes line up approximately with each other into homologous pairs. Telomeres cluster at one end of the nucleus and synapsis (pairing together of the homologous chromosomes) takes place in Zygotene/Zygonema.
What are some eight letter words with 1st letter Z and 3rd letter G and 5th letter T?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern Z-G-T---. That is, eight letter words with 1st letter Z and 3rd letter G and 5th letter T. In alphabetical order, they are: zygotene
What are some eight letter words with 1st letter Z and 3rd letter G and 4th letter O?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 4 words with the pattern Z-GO----. That is, eight letter words with 1st letter Z and 3rd letter G and 4th letter O. In alphabetical order, they are: zygodont zygomata zygosity zygotene
What are some eight letter words with 1st letter Z and 5th letter T and 6th letter E and 7th letter N?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern Z---TEN-. That is, eight letter words with 1st letter Z and 5th letter T and 6th letter E and 7th letter N. In alphabetical order, they are: zygotene
What are some eight letter words with 1st letter Z and 4th letter O and 5th letter T and 8th letter E?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern Z--OT--E. That is, eight letter words with 1st letter Z and 4th letter O and 5th letter T and 8th letter E. In alphabetical order, they are: zygotene
What are some eight letter words with 1st letter Z and 3rd letter G and 5th letter T and 6th letter E?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern Z-G-TE--. That is, eight letter words with 1st letter Z and 3rd letter G and 5th letter T and 6th letter E. In alphabetical order, they are: zygotene
What are some eight letter words with 2nd letter Y and 3rd letter G and 5th letter T and 7th letter N?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -YG-T-N-. That is, eight letter words with 2nd letter Y and 3rd letter G and 5th letter T and 7th letter N. In alphabetical order, they are: zygotene
What are some eight letter words with 1st letter Z and 2nd letter Y and 6th letter E and 7th letter N?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 3 words with the pattern ZY---EN-. That is, eight letter words with 1st letter Z and 2nd letter Y and 6th letter E and 7th letter N. In alphabetical order, they are: zygotene zymogene zymogens
What are some eight letter words with 1st letter Z and 3rd letter G and 4th letter O and 8th letter E?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern Z-GO---E. That is, eight letter words with 1st letter Z and 3rd letter G and 4th letter O and 8th letter E. In alphabetical order, they are: zygotene
What are the parts of meiosis?
STAGES ARE:a) Pre-meiotic interphase.(b) Leptotene.(c) Zygotene.(d) Pachytene.(e) Diplotene/ diakinesis.f) Metaphase I.(g) Anaphase I.(h) Metaphase II.(i) Anaphase II.(j) Telophase II.
What are some eight letter words with 1st letter Z and 2nd letter Y and 5th letter T and 6th letter E and 7th letter N?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern ZY--TEN-. That is, eight letter words with 1st letter Z and 2nd letter Y and 5th letter T and 6th letter E and 7th letter N. In alphabetical order, they are: zygotene
What are some eight letter words with 1st letter Z and 2nd letter Y and 6th letter E and 7th letter N and 8th letter E?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern ZY---ENE. That is, eight letter words with 1st letter Z and 2nd letter Y and 6th letter E and 7th letter N and 8th letter E. In alphabetical order, they are: zygotene zymogene
