Two sister chromatids are joined at the centromere prior to meiosis. Which statement is correct?
answer
Barring mutation, the two sister chromatids must be identical.
question
Which processes lead to most genetic variation in sexually reproducing organisms?
answer
random fertilization
crossing over
independent assortment of chromosomes in meiosis
question
Which of these gametes contains one or more recombinant chromosomes?
answer
B and C
question
Meiosis I produces _____ cells, each of which is _____.
answer
two ... haploid
question
Meiosis II typically produces _____ cells, each of which is _____.
answer
four ... haploid
question
During _____ sister chromatids separate.
answer
anaphase II
question
At the end of _____ and cytokinesis, haploid cells contain chromosomes that each consist of two sister chromatids.
answer
telophase I
question
Synapsis occurs during _____.
answer
Prophase I
question
Homologous chromosomes migrate to opposite poles during _____.
answer
anaphase I
question
During _____ chromosomes align single file along the equator of a haploid cell.
answer
metaphase II
question
At the end of _____ and cytokinesis there are four haploid cells.
answer
telophase II
question
During _____ a spindle forms in a haploid cell.
answer
prophase II
question
Look at the cell in the figure. Based on this figure, which of the following statements is true?
answer
This cell is diploid.
question
A human cell containing 22 autosomes and a Y chromosome is
answer
a sperm.
question
What is the best evidence telling you whether this cell is diploid or haploid?
answer
The cell is diploid because it contains two sets of chromosomes.
Only diploid cells contain two sets of chromosomes, one maternal and one paternal. Read about diploid cells.
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