Multi Celluar Part ttwo

Question 1

What if Meiosis goes Wrong ?

Answer 1

Down syndrome caused by extra copy of chromosomes 21, usually resulting from non-disjunction during meiosis 1 in the female ovary ,segregation errors during meiosis increases greatly with advancing material age

Question 2

Differences between Sperm and Egg ?

Answer 2

Sperm :

• Specialised for movement
• One of the smallest cells

Egg :

• Able to generate all cells in the body when activated usually by fertilisation
• Nutrients for the first few rounds of cell division , one of the cell types

Question 3

What does the Chromosomes ?

Answer 3

Segregate in Anaphase A and B

The sudden loss of sister -chromatid cohesion at the onset of anaphase leads to sister -chromatid sequence separation

Allowing the forces of the mitotic spindle to pull te sisters to opposite poles of the cell

Chromosomes move by two independent and overlapping processes

Question 4

First Anaphase /Second Anaphase

Answer 4

Initial polward of movement of chromosomes , due to shortening pole ward of kinetochore microtubules

Second Anaphase B Seperation of the spindle poles themselves , beginning after sister chromatids have separated and the daughter chromosomes , moved some distance apart

Segregated chromosomes are packaged in Daughter nuclei telophase .Daughter chromosomes have segregated into two equal group at opposite eneds of the cell

Telephase - Two sets of chromosomes are packaged into pair of daughter nuclei

Question 5

What does M- cdk AND Spindle Formation do ?

Answer 5

M-CDK

• Triggers events of early mitosis , including chromosomes condensation , assembly of the mitotic spindle and bi polar attachment of the sister chromatid pairs of microtubules of the spindle

Spindle Formation
- In animal dependent on the largely on the ability of mitotic environment to stimulate local microtubule .Nucletion and stability as well as the ability of motor proteins