Build a diploid set of homologous chromosomes

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Reference no: EM133544625

Question: Draw the cell cycle for a germline cell of meiosis including G1, S, G2 and all the stages of Meiosis.

- Build a diploid set of homologous chromosomes where 2n = 6. The two different colors (yellow and red) should represent maternal and paternal chromosomal contributions in each diploid cell (i.e., in each homologous pair of chromosomes, one chromosome will be yellow and one will be red). use black to represent centromeres.

- Use pencil to mark two gene loci on them. Start with a heterozygous cell with alleles A/a on one homologous chromosome pair and alleles B/b on another homologous chromosome pair.

- You can draw circles to represent the cell membrane, nuclear membrane, and mitotic spindle as you draw each stage in the cell cycle. (Note: the circles might change as you walk through the different stages).

- For each stage, state how many chromosomes, replicated chromosomes, and chromatids are present.

- As you draw the cell cycle + meiosis, be sure to follow these directions and answer the following questions

a. Model (and draw) Prophase of Meiosis I prior to crossing-over, label homologous chromosomes, a chromosomal tetrad, and note where the alleles are that you marked.

How many chromosomal tetrads does this cell contain?

b. Model (and draw) crossing over by exchanging segments of any two NON-sister chromatids.

Your drawing should include ONE chromosomal tetrad that has undergone a crossing over event.

c. Model and draw Metaphase I. Be sure to identify the outcome of the crossing over from step b) in your drawing.

d. Model and draw Anaphase I and Telophase I.

What happens to the alleles of the gene loci you marked at this stage?

Which of Mendel's Laws does this explain?

What are the genotypes of the resulting daughter cells?

How many different results can you possibly get?

Which of Mendel's Laws does this explain?

e. Model and draw Prophase II.

How many cells do you have now?

f. Model and draw Metaphase II.

How are Metaphase I and Metaphase II different?

g. Model and draw Telophase II and draw the result.

Indicate genetic differences among daughter cells.

Looking at the alleles you marked, what are the genotypes of the resulting daughter cells?

Are they different from the result obtained after Meiosis I? Why or why not?

Reference no: EM133544625

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