BIOL 207 - 1
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What is a cohesin/ what does it do?
- Protein Ring - 3 proteins
- Holds sister chromatids together
- Formed before the chromatids
What are the jobs of a cetromere?
- Where cohesin is found
- Where microtubules are found
What is the order of a Eukaryotic cell cycle?
- S (DNA Synth)
- Mitotic Phase:
- One chromosome set
- Ex. Gametes
- Two chromosome sets
- Ex. Embryo to adult
______ begins with the breakdown of the cohesin proteins rings.
How many chormosomes are in human haploid and diploid cells?
n = 23
2n = 46
What is the amount of DNA called?
What is the amount of DNA in: gametes, typical cells at G1, typical cells at G2?
c = 3100 Mb
2c = 6200 Mb
4c = 12400 Mb
Number of genes in a haploid cell
Name the mechanism responsible for each of the following:
1. 2n -> 2n
2. n -> n
3. n -> 2n
4. 2n -> n
- 1. Mitosis
- 2. Mitosis
- 3. Fertilization
- 4. Meiosis
Meiosis in females is...
2n --meiosis--> n + n + n + n
3 n's are disposed of to create one large oocyte
Meiosis in males is...
2n --meiosis--> n + n + n + n --differentiation (flagella)--> n~ + n~ + n~ + n~
Draw a typical human life cycle. (Or describe in words)
What is double fertilization?
Form of fertilization in angiosperms.
- 2 sperm enter egg
- 1 sperm fertilizes egg = diploid zygote
- 1 sperm combines with 2 polar nuclei = triploid nucleus
Triploid nucleus becomes endosperm = food for embryo
What is yeast "fertilization" called, and why is it not called fertilization?
Cell & Nuclear Fusion
2 cells of equal size coming together not 1 big and 1 small
What is unequal cell division in yeast called?
What are the differences between animals, plants, and fungi inregards to sexes, haploid cell reproduction, and n -> 2n? (Table)
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