Flashcards in Chromosome Ch6-7 Deck (39):
Purpose of mitosis
Cell dividing into two identical cells.
What kind of cells are produced at the end of mitosis?
How many times does the cell divide during mitosis?
What are sister chromatids?
What happens during prophase?
DNA is copied, chromosomes become visible, and nucleus begins to dissolve.
What happens during metaphase?
Chromosomes are attached to spindle fibers.
What happens during anaphase?
Chromosomes move away from each other.
What happens during telophase?
Chromosomes are at the opposite ends of each other and new nucleus is formed.
Is cytokinesis part of mitosis?
What happens during cytokinesis?
What is the purpose of meiosis?
Cell division with daughter cells having half the chromosomes as parent cells creating haploid cells.
How many times does the cell divide during meiosis?
What kind of cells are produced at the end of meiosis?
Normal body cell, contains 46 chromosomes, is considered diploid
Sex cell, egg or sperm, 23 chromosomes, haploid or N
Haploid +haploid = diploid
Have half the normal number of chromosomes.
Form of cell division that halves the number or chromosomes, occurs in sex cells (egg and sperm), same steps as mitosis just goes through them twice
Occurs in prophase 1, results in new genetic combinations
Features of meiosis
Crossing over, independent assortment, random which 23 pairs of the chromosomes goes to the cell, genetic combinations that result are nearly unlimited
What phase do spindle fibers and centrioles disappear?
DNA that is spread out in the nucleus of a non-dividing cell is called
What phase in the cell cycle do the cells spend most of their time doing their job in?
What structures do spindle fibers grow from?
Chromosomes that are the same and carry genes for the same trait are called
True/false: chromatids of a chromosome are identical
What phase does the spindle fibers and centrioles appear?
What is the dividing wall in telophase called?
Chromatids are ____ of chromosomes
What stage of meiosis does crossing over occur?
Mitosis/both/meiosis: cell divides only once, produces diploid cells, produces two cells, homologous chromosomes do not line up next to each other, occurs in somatic cells
Mitosis/both/meiosis: involves cellular division, DNA copied once, occurs in plant and animal cells
Mitosis/both/meiosis: produces haploid cell, occurs in germ cells, produces 4 cells, homologous chrom. line up paired with each other, new cells are different from each other
Reproduction of a cell by division into two equal parts
A chromosomes that is not a sex chromosome
Involved with determining sex of an organism
XY vs XX
XY= male. XX= female
Who determines the sex if the child?