chapter 8 reading quiz question 3
Interphase
A cell preparing to undergo meiosis duplicates its chromosome during:
The exchange of properties in non-sister chromatids only occurs in meiosis.
How is meiosis different from mitosis?
Four haploid cells
Meiosis starts with a single diploid cell and produces:
A trisomy of the 21st chromosome
What causes down-syndrome?
A cell with 2 chromosome sets
What's a diploid?
Prophase I
At what segment do non-sister chromatids combine?
Identical copies of each other if they are part of the same chromosome.
Chromatids are:
Homologous chromosomes separate and migrate toward opposite poles
During anaphase I:
It ensures that each daughter cell receives one copy of the chromosome.
During binary fission, each copy of the duplicating chromosome moves to the opposite ends of the cell. What does this achieve?
Sister chromatids separate and become full-fledged chromosomes that move to opposite poles.
In anaphase:
2^23
In humans, the haploid number of chromosomes is 23. Independent assortment has the possibility of producing how many different gametes?
Microtubules form the mitotic spindle, and the nuclear envelope breaks up.
In prophase:
Chromosomes become less condensed and new nuclear envelopes form. In cytokinesis the cytoplasm divides.
In telophase:
Meiosis I
In what stage do independent assortment and crossing over occur?
Sister chromatids separate and migrate towards opposite poles
During anaphase II:
Prophase I, Metaphase I, Anaphase I, Telophase I, cytokinesis, meiosis II
The correct order of events in meiosis is:
Interphase, when growth occurs. Cells that are about to divide replicate their DNA.
The majority of a cell's lifespan is spent in what stage?
Interphase, prophase, metaphase, anaphase, telophase
What is the order of the cell cycle?
Meiosis II
When do sister chromatids separate?
The mitosis spindle is fully formed and chromosomes are lined up in the center of the cell.
At metaphase:
Meiosis, gametes, fertilization, zygote, mitosis
What is the order of the life cycle?
A cell with a single chromosome set
What's a haploid?