Mitosis & meiosis
Mitosis is important for?
1. growth 2. replacement of cells and repair damaged tissues 3. asexual reproduction 4. immune system response
According to the table in the video, how many chromosomes are there in each cell at the very end of Meiosis?
23
In a reduction division of a cell with 46 chromosomes, how many chromosomes will the resulting cells contain?
23
how many chromosomes are there in sperm cells and egg cells?
23
Egg cells and sperm cells all come from "starter" cells that originally had __ chromosomes.
46
Humans have how many chromosomes?
46
When the 46 chromosomes replicate in interphase, how many chromatids result?
92
When a sperm cell with 23 chromosomes combines with an egg cell with 23 chromosomes, what is the result?
A fertilized egg with 46 chromosomes
What is pulled apart in anaphase 2?
Chromatids
What is it called when genetic information is exchanged between homologous chromosomes during prophase 1?
Crossing Over
What process completely splits the cytoplasm?
Cytokinesis
Chromosomes are made of?
DNA and protein
What happens during interphase?
DNA replicates, Growth, General Cell processes
Crossing over also happens during prophase 2
False
Meiosis in males produces four identical sperm cells.
False
Nondisjunction can result in...
Genetic Disorders
What kind of chromosomes are approximately the same size and contain the genes for the same traits?
Homologous Chromosomes
which process involves two divisions?
Meiosis
Meiosis
Meiosis is a process that contributes to genetic variety
What is the difference between metaphase 1 and 2?
Metaphase 1 has homologous pairing while in metaphase 2 the chromosomes line up single file.
Mitosis
Mitosis makes identical body cells like your skin cells and stomach cells
In what stage of Meiosis does crossing-over happen?
Prophase I
What pulls the chromosomes apart in anaphase?
Spindle Fibers
According to the video, how is Metaphase I in Meiosis different from Metaphase in Mitosis?
The chromosomes line up next to their homologous pair.
Interphase happens ________ the start of Meiosis.
before
Meiosis doesn't make?
body cells
Crossing-over takes place between.
homologous chromosomes
DNA gets copied or duplicated in...
interphase
What process happens before both mitosis and meiosis?
interphase
Meiosis makes?
sperm cells and egg cells (also known as gametes)