Study Guides (238,127)
Canada (114,941)
Biology (222)
BLG 144 (9)

bio unit 3.odt

2 Pages
Unlock Document

Ryerson University
BLG 144
Richard Stew

i t o t i 1. What are chromosomes other than sex chromosomes called? c Chromosomes other than sex chromosomes are called autosomes. Each human sperm or egg cell contains _ 22 autosomes and one sex chromosome. s p 2. Explain the different between cytokinesis in animal cells and plant cells. i Cytokinesis is the period during the cell cycle in which the cytoplasm separates to form two new n daughter cells. Cell division occurs after mitosis. In plant cells, a new cell wall forms to divide the cell d into two daughter cells. In animals cells,the cleavage furrow forms as the cell membrane is pinched l inwards to divide the cytoplasm equally to form two new daughter cells. e _ 3. Why must cytokinesis occur after, rather than before, anaphase? a Cytokinesis must occur after anaphase because before anaphase the chromatids are still bound together p by the centromere. If cytokinesis was to occur at this point, each new daughter cell would not have a p complete copy of chromosomes. During anaphase, the chromatids are pulled apart to opposite sides of the a cell by spindle fibres to ensure each new cell contains one of the chromatids, and therefore the same r genetic information. This is essential for the performance, and survival of the cell. a t 4. What functions does cell division accomplish? u 1. cell division allows for growth and development.Azygote starts off as a single cell and divides and s reproduces to form a fetus. Cells continue to divide as the baby grows to be an adult. _ 2. cell division allows to regenerate damaged tissues. For ex: your skin cells divide and reproduce new a cells to replace damaged/lost skin from injuries. n 3. cell division is also necessary for maintenance of the body. Some cells need to be replaced because d they cannot function properly. Other cells need to be replaced when they die. EX: millions of red blood _ cells die every day, and are replaced by new ones. t h 5. Describe the functions of the mitotic spindle apparatus and the centromere. e The centromere holds the two sister chromatids together. Sister chromatids are genetic copies of each _ other. The centromere holds the chromatids together through the prophase, and metaphase. Once mitosis c reaches the anaphase, the spindle apparatus attach to opposite sides of the chromatids which are aligned e in the middle of the cell. The main function of the spindle apparatus is to pull the two chromatids apart n and separate them to opposite sides of the cell. This is to ensure that each new daughter cell has a copy of t the cells genetic information which lies in the chromosomes. r o 6. Why is the replication process during interphase so important to cell division? m Chromosomes within the nucleus of a cell hold the genetic information needed to main
More Less

Related notes for BLG 144

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.