Question

1. refer to the chromosomes in the cells in model 1.

a. draw a single chromosome as it appears in model 1.
b. draw a replicated chromosome as it appears in model 1.
c. how many chromatids are in each replicated chromosome?

1. how many replicated chromosomes are in the original cell shown in model 1 during prophase? hint: when counting chromosomes, count “1” for a pair of sister chromatids.
2. how many single chromosomes are in each of the new cells in telophase?
3. as a group, write a grammatically correct sentence that explains what a chromosome is and why it is important.
4. refer to the cells in telophase in model 1.

a. use a complete sentence to describe what the new cells in telophase might contain if replication of chromosomes did not occur before cytokinesis.
b. if the situation in part a occurred, would the new cells be viable? explain.

Explanation:

5a:

Drawing a single chromosome requires knowledge of its basic structure which is a thread - like structure. However, as this is text - based, we can't actually draw. A single non - replicated chromosome consists of a single DNA molecule.

5b:

A replicated chromosome has two sister chromatids attached at the centromere. Again, can't draw here but conceptually it looks like an 'X' - shaped structure with the centromere at the middle.

5c:

A replicated chromosome has two sister chromatids.

6:

In prophase, the chromosomes have replicated. We count each pair of sister chromatids as one chromosome according to the hint. Without seeing Model 1, we assume we count the number of these 'pairs'.

7:

In telophase, after the sister chromatids have separated during anaphase, each new cell will have single chromosomes. The number depends on the original cell's chromosome number and the type of cell division (mitosis or meiosis). Without Model 1 details, we can't give a specific number.

8:

A chromosome is a structure made of DNA and proteins that contains the genetic information of an organism. It is important because it carries the genes which determine the traits and functions of the organism.

Answer:

5a: Cannot be drawn in this text - based format. A single chromosome is a thread - like structure with one DNA molecule.
5b: Cannot be drawn in this text - based format. A replicated chromosome has an 'X' - like shape with two sister chromatids joined at the centromere.
5c: 2