Question

Based on the picture below, answer the following T/F questions. Explain your answer. a. The two chromosomes on the left (#1) are homologous to the chromosomes on the right (#2). b. The picture shows sister chromatids, homologous chromosomes, and different chromosomes. c. There are four total pieces of dsDNA present in this picture. d. There are four centromeres present in this picture. e. There are eight telomeres present in this picture. f. Cohesin and condensin are present and intact. g. CENP-A is present.

Answer 1

Answer:

a) False.

b) True.

c) False.

d) True.

e) False.

f) True

g) True.

Explanation:

a) The main characteristic of homologous chromosomes is that they have an equal size. There is a difference in size on both chromosomes.

b) In number one, two chromosomes are homologous. In number two also two chromosomes are homologous. On the other hand, the chromosomes at number one and two are different. Each chromosome has two sister chromatids.

c) A DNA molecule has a double helix, that is, two chains. When a DNA chain is broken and a chromatide has a DNA chain, then two chromatids make up a chromosome and a DNA chain, in this way there are eight dsDNA molecules

d) If each chromosome contains a centromere, therefore, there are four centromeres on all four chromosomes.

e) If a chromosome contains four telomeres, therefore there will be sixteen telomeres.

f) The function of cohesin is to regulate the separation of chromatids in the cell division process. When DNA replication is complete, the DNA compacts and condenses to form mitotic chromosomes.

g) The CENPA protein is encoded by the CENPA gene.