Meiosis, Genetic Variation, and Natural Selection
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Curipod generated lesson: "Meiosis, Genetic Variation, and Natural Selection". #8-10
csteele
Updated 5 months ago
1. Open question
240 seconds
In the next two minutes, write as many observations as you can about the mice in the images below
2. Slide
60 seconds
How and Why Populations Change Over Time
Introduction to Genetic Variation
3. Slide
60 seconds
By the end of this week:
Learning objectives
4. Slide
60 seconds
Rock Pocket Mice are a species of rodent found in the Sonoran Desert Volcanic activity in the Sonoran Desert has caused the ground to become a mosaic of light-colored sand and dark lava rock
Meet the Rock Pocket Mouse
5. Open question
180 seconds
In terms of genetic diversity, why do you think it might be important that mice in different areas of the Sonoran are "reproductively isolated" from each other?
6. Drawings
180 seconds
Scientists are interested in the fur color variations seen in these mice, so they tracked the number of light and dark colored mice at different field sites. The image below shows data taken over a period of 10 years from study site B. Use the drawing tool to illustrate the chronological order you think these field samples belong in
7. Open question
180 seconds
The graphs below show data for rock pocket mouse populations in two sites over time. What are some possible explanations for the trends we see in the data?
8. Open question
180 seconds
What are some potential consequences of a lack of genetic diversity within a species?
9. Slide
60 seconds
Meiosis: Process that occurs in sexually reproducing eukaryotes
Genetic Variation and Meiosis
10. Slide
60 seconds
11. Open question
240 seconds
Meiosis is very similar to Mitosis. Investigate the image below and identify differences between the two processes.
12. Slide
60 seconds
How and Why Populations Change Over Time (Day 2)
Introduction to Genetic Variation
13. Slide
60 seconds
By the end of this week:
Learning objectives
14. Poll
30 seconds
Mutations are heritable if they occur in...
- Somatic cells
- Gamete cells
- Both
15. Drawings
750 seconds
The difference in fur color between rock pocket mice has been traced to a point mutation in a gene called Mc1r, which controls how much eumelanin and pheomelanin are produced by mouse hair follicles. Draw how this mutation, if it occured in a gametocyte , could be passed to offspring via Meiosis.
16. Slide
60 seconds
The Mc1r
Do all dark-furred mice have the same genetic mutation?
17. Slide
60 seconds
In mouse populations from a dark lava flow called the The table on the next slide shows data for these codons in dark mice from four different lava flows (including
Do all dark-furred mice have the same genetic mutation?
18. Open question
330 seconds
What can we observe about the relationship between phenotype and mc1r alleles in these populations?
19. Open question
330 seconds
What are some possible explanations for the fact that dark-colored mice from Kenzin , Armendaris , and Carrizozo have the same mc1r allele as light-colored mice from Pinacate?
20. Open question
330 seconds
What determines whether a mutation is adaptive or maladaptive?
21. Open question
450 seconds
Evolutionary developmental biologist Dr. Sean B. Carroll has said that "while mutation is random, natural selection is not." Scientists have observed that populations of rock pocket mice living on light-colored desert rocks and sand are mostly light in color, but some mice with dark fur are always present. Meanwhile, populations of rock pocket mice living on dark-colored lava flows are mostly dark in color, but some mice with light fur are always present. What are some ideas about mutation, natural selection, and meiosis, and pieces of evidence from our study of Rock Pocket Mice, that we can use to explain the fact that every population of mice contains individuals with both fur colors, but in different proportions?
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