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Online Activity (PH Successnet 9.6)

The animation in this activity models how new combinations of genes are formed when two homologous chromosomes exchange pieces during meiosis. You will observe how this process, called crossing over, increases genetic variation.

1. One chromosome started with the genes ABCDEFG. What is the new combination of genes that resulted from crossing over?

2. One chromosome started with abcdefg. What is the new combination of genes on this chromosome?

3. Suppose the crossing over occurred between E and f. What would the new combination be on the two chromatids?

4. Does crossing over affect both sister chromatids in a pair, or just one? How does that affect the four new daughter cells that are created in meiosis?

Online Activity (PH Successnet 9.5)

1. Look at the human karyotype – a picture of all of the chromosomes found in a cell, arranged in a specific order. How many are from the egg? How many are from the sperm?

2. How many total chromosomes do humans have? How many come from your mom? How many come from your dad?

3. What are some genes found on the following chromosomes?

a. Chromosome 1 –

b. Chromosome 4 -

c. Chromosome 9 –

d. Chromosome 13 –

e. Chromosome 18 –

f. X and Y Chromosomes –

4. Watch the animation go through the steps of meiosis. For each step, write down what happens. (Use words like chromosomes, nuclear envelope, tetrad, centrioles, spindle fibers, homologous pair, sister chromatids… etc)

a. Prophase I –

b. Metaphase I –

c. Anaphase I –

d. Telophase and Cytokinesis I –

e. Prophase II –

f. Metaphase II –

g. Anaphase II –

h. Telophase and Cytokinesis II –

5. Does interphase happen again between meiosis I and meiosis II? Why / Why not?

6. How are meiosis I and meiosis II similar? How are they different? (Make a venn diagram if you want)

7. Label the following types of cells as haploid or diploid:

a. Sperm d. Early embryo

b. Egg e. Adult

c. Zygote

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