enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Chromosome segregation - Wikipedia

    en.wikipedia.org/wiki/Chromosome_segregation

    This process results in each gamete usually containing a mixture of chromosomes from both original parents. Improper chromosome segregation (see non-disjunction, disomy) can result in aneuploid gametes having either too few or too many chromosomes. The second stage at which segregation occurs during meiosis is prophase II (see meiosis diagram ...

  3. Meiosis - Wikipedia

    en.wikipedia.org/wiki/Meiosis

    Mechanically, the process is similar to mitosis, though its genetic results are fundamentally different. The result is the production of four haploid cells (n chromosomes; 23 in humans) from the two haploid cells (with n chromosomes, each consisting of two sister chromatids) [clarification needed] produced in meiosis I. The four main steps of ...

  4. Non-random segregation of chromosomes - Wikipedia

    en.wikipedia.org/wiki/Non-random_segregation_of...

    In some aphid species, males have two different X chromosomes (X 1 X 2 0), which are not mechanically linked and yet reach the same spindle pole during meiosis I. [3] [2] This is consistent with the directional segregation mode of a single X chromosome described above. In other aphid species, four different chromosomes probably cosegregate in ...

  5. Meiotic recombination checkpoint - Wikipedia

    en.wikipedia.org/wiki/Meiotic_recombination...

    Ndt80 is a meiosis-specific transcription factor required for successful completion of meiosis and spore formation. [17] The protein recognizes and binds to the middle sporulation element (MSE) 5'-C[AG]CAAA[AT]-3' in the promoter region of stage-specific genes that are required for progression through meiosis and sporulation.

  6. Sister chromatids - Wikipedia

    en.wikipedia.org/wiki/Sister_chromatids

    In mitosis, the sister chromatids separate into the daughter cells, but are now referred to as chromosomes (rather than chromatids) much in the way that one child is not referred to as a single twin. Schematic karyogram of a human, showing a diploid set of chromosomes as seen in the G 0 and G 1 phases of the cell cycle (before DNA synthesis ...

  7. Genetic linkage - Wikipedia

    en.wikipedia.org/wiki/Genetic_linkage

    Genetic linkage is the tendency of DNA sequences that are close together on a chromosome to be inherited together during the meiosis phase of sexual reproduction.Two genetic markers that are physically near to each other are unlikely to be separated onto different chromatids during chromosomal crossover, and are therefore said to be more linked than markers that are far apart.

  8. Meiotic drive - Wikipedia

    en.wikipedia.org/wiki/Meiotic_drive

    Three independent driving X chromosomes are known in D. simulans, called Paris, Durham, and Winters. In Paris, the driving gene encodes a DNA modelling protein ("heterochromatin protein 1 D2" or HP1D2 ), where the allele of the driving copy fails to prepare the male Y chromosome for meiosis. [ 12 ]

  9. Chromosome 3 - Wikipedia

    en.wikipedia.org/wiki/Chromosome_3

    Chromosome 3 is one of the 23 pairs of chromosomes in humans. People normally have two copies of this chromosome. People normally have two copies of this chromosome. Chromosome 3 spans more than 198 million base pairs (the building material of DNA ) and represents about 6.5 percent of the total DNA in cells .