Female reproductive cell

The joining of an egg and a sperm

formed by fertilization

sex cells are...

the two divisions of the nucleus

each chromosome is duplicated before meiosis 1 and not meiosis 2

crossing over happens

Crossing-over ________________ the number of possible gene combinations

the pairs of duplicated chromosomes line up in the center of the cell

The centromere of each chromatid pair becomes attached to ___ spindle fiber in metaphase 1

the two pairs of chromatids of each similar pair move away from each other to opposite ends of the cell

the nuclear membrane reforms, and two new cells form

the cytoplasm splits and forms two new cells

The chromatids of each duplicated chromosome will be separated during this division

the duplicated chromosomes and spindle fibers reappear in each new cell, the nuclear membrane breaks apart

the duplicated chromosomes move to the center of the cell, each centromere now attaches to two spindle fibers instead of one

The centromere divides during _________________, and the chromatids separate and move to opposite ends of the cell. Each chromatid now is an individual chromosome.

the spindle fibers disappear, and a nuclear membrane forms around the chromosomes at each end of the cell

When does the cytplasm divide?

Down syndrome

female

male

_______ and _______ are the two types of cells your body forms.

_______ is the chemical code that is stored in the cell’s hereditary material.