X-Inactivation and Chromosomal Composition

The video explains the genetic differences between men and women, focusing on X and Y chromosomes. It discusses the discovery of X chromosome inactivation in women, where one X chromosome is inactive in each cell. The video also explores how cells decide to become either 'Mom' or 'Dad' cells, with experiments showing that this process is not entirely random.

What is the chromosomal composition of a typical male?

• Two X chromosomes

• One X and one Y chromosome

• Two Y chromosomes

• One X chromosome only

In women, what happens to one of the X chromosomes in each cell?

• It becomes more active

• It duplicates

• It becomes inactive

• It is removed

What is a 'Dad cell' in the context of X-inactivation?

• A cell with an active X chromosome from the father

• A cell with no active X chromosome

• A cell with an inactive Y chromosome

• A cell with an active X chromosome from the mother

What did scientists initially believe about the process of X-inactivation?

• It was determined by the father's genes

• It was the same in all cells

• It was completely random

• It was influenced by environmental factors

What did experiments with mice reveal about organ development?

• Organs are always a mix of Mom and Dad cells

• Organs develop without any X-inactivation

• Organs can be predominantly Mom cells

• Organs are unaffected by X-inactivation