In recent years, scientists have mapped the nuclear genome ofthe Dodo bird, by extracting DNA from a 20,000- and 60,000-year-oldDodo feather. This extinct diploid possessed a haploid (n) numberof 18. What is the number of nuclear DNA molecules present in theDodo bird cell for each of these scenarios:
a. At the end of Telophase of mitosis
b. At the end of Telophase I of meiosis
c. At the end of Telophase II of meiosis
d. Metaphase of mitosis
e. Metaphase I of meiosis
In recent years, scientists have mapped the nuclear genome ofthe Dodo bird, by extracting DNA from a 20,000- and 60,000-year-oldDodo feather. This extinct diploid possessed a haploid (n) numberof 18. What is the number of nuclear DNA molecules present in theDodo bird cell for each of these scenarios:
a. At the end of Telophase of mitosis
b. At the end of Telophase I of meiosis
c. At the end of Telophase II of meiosis
d. Metaphase of mitosis
e. Metaphase I of meiosis
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Title: Meiosis Lab
Part 1: Modeling Meiosis Without Crossing Over (reformat as needed)
Take photos of the following stages of your meiosis bead simulation. Insert and label the following images:
Meiosis 1: Prophase I and Metaphase I
Meiosis 2: Metaphase II and Telophase II
Part 2: Modeling Meiosis With Crossing Over (reformat as needed)
Take photos of the following stages of your meiosis bead simulation. Insert and label the following images:
Meiosis with Crossing Over: Metaphase I and Telophase II
Questions â use the lab Introduction, your textbook and other sources to answer the following.
What is the state of DNA at the end of meiosis I? Are the chromosomes replicated or unreplicated? Diploid or haploid?
Why are chromosomes important?
How are Meiosis I and Meiosis II different?
Name two ways meiosis contribute to genetic recombination or genetic variety.
Why do you use non-sister chromatids to demonstrate crossing over? What would happen if you crossed over sister chromatids?
How many chromosomes were present in your simulation when meiosis I started?
Why is it necessary to reduce the chromosome number in gametes, but not in other cells of an organism?
If humans have 46 chromosomes in each of their body cells, determine how many chromosomes you would expect to find in the following:
| Sperm | Egg | Daughter cell after mitosis | Daughter cell after meiosis |
Investigate a disease that is caused by a chromosomal mutation due to nondisjunction. When does the mutation occur? What chromosome is affected? What are the consequences?
Question 3 (5 points)
Match the terms to the definitions provided.
Question 3 options:
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Question 4 (7 points)
Match the terms to the definitions provided.
Question 4 options:
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Save
Question 5 (6 points)
Put the events of a MAP kinase cascade in the correct order.
Question 5 options:
| MAPKKK phosphorylates and activates another kinase | |
| MAPKK phosphorylates and activates MAPK | |
| Binding of MAPKKK to Ras | |
| External signal binds to membrane receptor and activates receptor kinase. | |
| MAPK phosphorylates an inactive response protein and activates it. | |
| Phosphorylation of receptor kinase and interaction with RAS |