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Tetrad

Definition

noun, plural: tetrads

(1) (cell biology) A group of four closely associated chromatids of a homologous pair formed by synapsis.

(2) (genetics) The four spores of yeast.

(3) (chemistry) A tetravalent atom; a quadrivalent element.

(4) A group consisting of four; the number four.


Supplement

In cell biology, a tetrad pertains to the structure formed by the synapsis of homologous chromosomes during the prophase I of meiosis.


Word origin: Greek tetras, tetrad-

Synonym: bivalent

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Expected frequency of tetrad spores with Tetratype

... I've spend the last hour trying to figure this out but I just can't understand this problem. ------------------- The fungi S. cerevisiae creates tetrad spores. How high of a ratio can be expected of tetrad spores with tetratype (both parental types and recombinants) if there are 14 map units ...

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by sproti
Sat May 18, 2013 3:50 am
 
Forum: Genetics
Topic: Expected frequency of tetrad spores with Tetratype
Replies: 0
Views: 1088

Recombination vs. Recombinants

1. You have a tetrad in crossover (say AB maternal and CD paternal): ------------A---------/---------B--------- ------------A---------/---------B--------- ------------C---------/---------D--------- ------------C---------/---------D--------- ...

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by Cat
Thu Sep 20, 2012 6:18 pm
 
Forum: Genetics
Topic: Recombination vs. Recombinants
Replies: 1
Views: 1419

Re: Differences Between Mitosis and Meiosis, Help please

Essentially you are correct. During a meiotic cell division, homologous chromosomes form a tetrad during synapsis and undergo disjunction during Anaphase I, reducing the total chromosome number by half. During mitosis however, homologous chromosomes do not pair up. During ...

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by dkush87
Thu Jan 20, 2011 3:55 pm
 
Forum: Genetics
Topic: Differences Between Mitosis and Meiosis, Help please
Replies: 2
Views: 9247

Differences Between Mitosis and Meiosis, Help please

... cell division. I have looked through my notes and textbook and all I can really sum up is that in the second instance using mitotic division, a tetrad would not be formed. I feel like that isn't a complete explanation, any help filling in some gaps would be appreciated.

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by Mikeylikey
Wed Nov 17, 2010 10:40 pm
 
Forum: Genetics
Topic: Differences Between Mitosis and Meiosis, Help please
Replies: 2
Views: 9247

Biology Meiosis Drawing Help!

... *Include a cross over even on each chromosome during proper phase of meiosis. Color code the pairs of chromosomes. Point out where synapsis and tetrad formation take place. Please help draw this on PAINT and post the picture up here so i can understand meiosis better for this situation of the ...

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by applegrapekiwiorange
Tue Dec 01, 2009 6:26 pm
 
Forum: General Discussion
Topic: Biology Meiosis Drawing Help!
Replies: 2
Views: 2597
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