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by BlastRoom
Follow the chromosome number through two divisions to four haploid cells and see where variation comes from.
#biology
40 questions
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A cell of an organism whose diploid number is 12 begins meiosis. How many chromosomes are present in each of the two cells produced at the end of meiosis I?
A human cell containing 46 chromosomes completes both divisions of meiosis. How many chromosomes does each of the four resulting cells contain?
A cell whose diploid number is 8 finishes copying its DNA in interphase and enters prophase I. How many chromosomes does the cell contain at that moment?
An organism has a diploid number of 20. How many homologous pairs line up at the middle of the cell during metaphase I?
A grasshopper has a diploid number of 24. How many chromosomes does one of its sperm cells carry?
A corn plant cell containing 20 chromosomes goes through meiosis. Which statement describes the cells that are produced?
At which point in meiosis does the chromosome number per cell drop from diploid to haploid?
An organism has a diploid number of 10. How many chromosomes are present in a cell at metaphase II of meiosis?
Look at the diagram. Which stage of meiosis is this cell in?
The cell in the diagram has its chromosomes held at the equator by spindle fibers. Which stage of meiosis is shown?
Which stage of meiosis does the diagram show?
The cell in the diagram is splitting in two, and each new nucleus holds chromosomes that still have two sister chromatids. Which stage of meiosis is this?
The two cells in the diagram were made by the first division of meiosis. How will the first stage of their second division differ from prophase I?
Look at the diagram. Which stage of meiosis is it?
The two cells in the diagram are in metaphase II. Which stage comes next in each of them?
The diagram shows the last stage of meiosis. Which stage is it?
The diagram shows a cell part-way through meiosis. Which stage will begin as soon as the spindle fibers shorten?
The two cells in the diagram have just been produced by the first division of meiosis. Which stage do they enter next?
The two chromosomes at the center of the cell in the diagram have swapped matching segments with each other. What is this event called?
What is the paired structure shown at the center of the cell in the diagram called?
Homologous chromosomes pair up and trade matching pieces of DNA during which stage of meiosis?
Crossing-over increases the genetic variation among the gametes an organism makes because it
What happens during metaphase I that causes independent assortment?
An organism has three pairs of homologous chromosomes. Counting only independent assortment, how many different chromosome combinations can its gametes have?
Which of these events happens in meiosis but never in mitosis?
How do the cells present at the end of meiosis II compare with the single cell that entered meiosis?
Meiosis produces four cells that are genetically identical to one another.
In what way do the two cells produced by meiosis I differ from the cell that entered meiosis?
Why are the four cells produced by meiosis described as haploid?
A student claims that the cells made by meiosis are the same as the parent cell, just as the products of mitosis are. Which observation shows the claim is wrong?
Which division of meiosis works most like mitosis, and why?
Which statement correctly compares a cell at the end of meiosis I with the cell that entered meiosis?
Two sperm cells from the same man are almost never genetically identical. Which two events of meiosis best explain this?
A human sperm cell and a human egg cell each contain 23 chromosomes, while a human skin cell contains 46. Which process produced the cells containing 23?
A sperm cell and an egg cell join during fertilization. What is the single cell that forms called?
A dog has a diploid number of 78. How many chromosomes are in a dog zygote right after fertilization?
Why must the gametes of a species be haploid?
In humans, meiosis takes place in the testes and the ovaries.
Which cells of the human body are produced by meiosis rather than by mitosis?
A pollen grain and an egg cell of a flowering plant each contain 7 chromosomes. What is the diploid number of that plant?
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Where Genetic Variation Comes From
20 questions
