A vet in Lima studies a domestic cat, which has 2n = 38 chromosomes…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A vet in Lima studies a domestic cat, which has chromosomes. A cell of its testis divides by meiosis.
- How many bivalents form in prophase I?
- How many chromatids are in the cell at metaphase I?
- How many chromosomes reach each pole at the end of anaphase I?
- How many chromosomes does one cell have in the middle of anaphase II?
- How many chromosomes does each of the four final cells have?
Need a reminder? The key ideaShow
Meiosis I separates the homologues, and each cell gets half the chromosomes, each of two chromatids. Meiosis II separates the sister chromatids. The DNA of a human cell goes C, C, C and C. A cell in anaphase II has the diploid number of chromosomes, but only C of DNA.
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. .
Plan. Use the table of the lesson.
Step 1. Bivalents. .
Step 2. Chromatids at metaphase I. .
Step 3. At each pole after anaphase I. The homologues separate, so each pole gets chromosomes, each of two chromatids.
Step 4. Anaphase II. Each cell has chromosomes, each of two chromatids. They separate and are counted as chromosomes.
Step 5. The final cells. Each has chromosomes, each a single chromatid.
Answer: ; ; ; ; .
Check. The cat's gamete has chromosomes, half of .
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