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19 terms

Chapter 11

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As a result of meiotic division, the chromosome number is
halved
Reduction division occurs during
Meiosis
Meisis results in a change in chromosomal number as shown by
2n to n
Meiosis differs from mitosis in that
it occurs in the formation of gametes
True or False Meiosis-daughter cells with twice the chromosome number as the mother cell
False
Crossing-over
Is a way to recombine the genetic material during meiosis
During cross-over
recombination occurs between the genes on the sister chromatids of homologous pairs.
One duplication of chromosomes followed by two subsequent reduction divisions occurs
only in meiosis
Tetrads are seen
during meiosis I
During meiosis II
chromatids separate
Why do homologous chromosomes pairs in prophase I and not in prophase II
The cells are haploid during prophase II and therefore can't pair.
An error in meiosis that results in an abnormal number of chromosomes in the final haploid cell
~can result from the failure of chromosomes to move to opposite poles during meiosos I and II
~is a condition called aneuploidy
~can result form nondisjunction
In plants, the direct result of meiosis is the porduction of gametes. True or False
False
During which phase of meiosis does crossing over occur?
Prophase I
True or False: Meiosis involves two nuclear divisions without having DNA replication occurring between meiosis I and II
True
A single diploid cell is divided into two haploid cells during
crossing over
Daughter nuclei form from each parent cell during
telophase I and telophase II
Tetrads form during
Prophase I
In which stage are duplicated chromosomes singly lined up during meiosis
only metaphase I