Bio161 Lab Report #6 PDF

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Lab Report #6
Investigating the Cell Cycle
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Lab Report #6 Investigating the Cell Cycle

Results: - see report booklet Responses to Review Questions: 1.) List  TWO ways that homologous chromosomes differ from sister chromatids.

Sister chromatids are exact copies of each other. On the other hand, homologous chromosomes are not exact copies of each other. Homologous chromosomes are similar to each other in the sense that they contain the same gene in the same order; however they are different alleles of the gene and they come from different sources, one is from the mother and the other is from the father.

2.) During mitosis it is important for sister chromatids to stick together (called "cohesion") during some stages and then separate. Researchers have identified proteins called "cohesins" that are involved in sister chromatid cohesion. If you wanted to look for cohesin proteins in a mitotic cell WHERE would you look? Also, WHEN during mitosis (during what stages) would you expect to find cohesin?

Cohesin proteins are present between two sister chromatids so that they are held firmly together. They play an important role during prophase and metaphase, especially during metaphase holding the sister chromatids during their alignment in center of the cell. Then the movement of each of the chromatids towards the opposite sides of the daughter cells can be ensured and mediated during anaphase....