6.5 Variability of chromosomes

Question 1

What are sister chromatids?

Answer 1

Identical copies of DNA formed by the replication of a chromasome

Question 1

What is the name of the shorter arms on a chromosome (top)?

Answer 1

p arms

Question 2

What is the name of the longer arms on a chromosome (bottom)?

Answer 2

q arms

Question 3

What is the constriction point of the chromosome?

Answer 3

Centromere

Question 4

Describe metacentric

Answer 4

-Centromere is positioned in the middle of the chromsome
-P and q arms are of equal length

Question 5

Describe submetacentric

Answer 5

-Centromere is positioned higher towards one end
-q arms approx twice the length of the shorter p arms

Question 6

Describe acrocentric

Answer 6

-Centromere is positioned very close to one end
-p arms are very short and q arms are long

Question 7

Describe telocentric

Answer 7

-Centromere is positioned at the tip of the chromosome
-no p arms
-think of “telophase”

Question 8

How does complexity of an organism relate to the number of chromosomes it has?

Answer 8

There is no correlation