Animal Reproduction Flashcards
How many sets of chromosomes do our cells each contain? How many chromosomes are in each set?
Each of our cells contain 2 sets of chromosomes with 23 chromosomes in each set (46 chromosomes in all). They are inherited by the parents (each parent passes on 23 chromosomes).
What is mitosis?
The division of the nucleus.
What is the first step of mitosis (cell division)?
The cell gets ready to divide, the chromosome material duplicates itself (does not look like chromosomes yet).
What is the second step in cell division?
Chromosome pairs coil, becoming short and thick. They can be seen clearly. The nuclear membrane disappears, and spindle fibers form in the cytoplasm. They attach to the chromosomes and to both ends of the cell.
What is the third step of mitosis?
The two double chromosomes line up at the centre of the cell.
What is the fourth step of cell division?
The halves of each double chromosomes separate and move to opposite ends of the cell.
What is the fifth step in cell division?
The cell begins to pinch in two.
What is the sixth step in mitosis?
A new nuclear membrane forms in each daughter cell. The chromosomes uncoil. The cell has divided and there are now two daughter cells. Each daughter cell is exactly alike.
What part of the cell controls cell division?
The nucleus.
Cell division is a form of __________ reproduction.
ASEXUAL
Only one parent cell divides to form daughter cells
What is regeneration?
The ability to of an animal to regrow body parts.
How much an animal can regenerate depends upon what?
How complicated that animal is.
What can mammals regenerate?
Skin, nails, hair, and certain other tissues. Mammals cannot regenerate whole parts.
What is cell division?
Cell division: cells divide in 2.
