Biology Questions and Answers
provides recombination of alleles (of
different genes) linked in the samechromosome during cell divison by
meiosis.
- What are the “chiasms” of
homologous chromosomes
seen in prophase I?
Chiasmsin the form of X. are intersections of two tracts
The chiasms seen in prophase I are
chromosome arms of their homologous. In fact whenarms crossing over same (^)
chiasms are seen under the microscope
chromatidschromosomal se are exchanginggments with ot (^) her
chromatids of its homologous.
- Is there interphase again
between meiosis I and
meiosis II?
There is no interphase noduplication between the divisions ofr DNA (^)
meiosis. Only a sdiakinesis occurs.hort interval called
- What are the periods of
the second meiotic division?
Meiosis II is divided into prophase metaphase II, anaphase II and telofaseII, (^)
II.
- What are the respective
functions of the separation of
homologous chromosomes
and of the separation of
identical chromatids in
meiosis?
The separation of homologous
chromosomes ifunctions: to reduce to a half the totaln meiosis I has two main
number of chromosomes, generating
haploid process, andaughter cells at the d to make possible geneticend of the
recombinatioaleatory, i.e., each pair of daughter cellsn since the separation is (^)
can be different from the other pair
relating chrpaternal and maternal oomosomal combirigins. (Annation frd ifom
crossing over is considered each of the
four resultinthe others.)g cells can be different from
The separation meiosis II has thof identicale same function it chromatids has in
in mitosis: to separate the
chromosomes alrdaughter cells. eady duplicated to the
- During which meiosis
division does ploidy reduction
occur? Does ploidy reduction
occur in mitosis?
In the cell division breduction occurs in meiosisy meiosis ploidy II. Initially, (^)
taking as example a 2n somatic cell,
ploidy increases to 4DNA) during interphase. Dn (duplicationuring meiosis of (^)
I, since homologous chromosomes are
separated, number) and then during meiosis IIploidy falls to 2n (the original
ploidy finally falls to n in the resulting
daughter cells.
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