One parent reproduces genetically identical offspring by mitosis
Two parents give rise to offspring that have unique combinations of genes inherited from the two parents.
Where does asexual reproduction occur?
Where does sexual reproduction occur?
One set of chromosomes is inherited from each parent during sexual reproduction in what type of organisms?
Have 2 sets of 23 chromosomes for a total of 46.
Have a homologous pair of X chromosomes (XX)
Have one X chromosome and one Y chromosome (XY)
22 pairs of chromosomes that do not determine sex.
Splits homologus chromosomes
1st cell division of meiosis
Splits sister chromatids
2nd cell division of meiosis
Produces haploid gametes from diploid mother cells
Starts as diploid mother cells and ends as diploid mother cells
homologous chromosomes separate resulting in two haploid daughter cells with replicated chromosomes.
1st cell division of meiosis 1
Sister chromatids separate resulting in four haploid daughter cells with unreplicated chromosomes.
2nd cell division of meiosis 2
Occurs in meiosis 1
Occurs in meiosis 2
How many chromosome does a diploid cell have?
How many pairs of chromosomes does a diploid cell have?
How many chromosomes does a haploid cell have?
Homologus pairs are joined together side by side to form what type of structure?
Tetrads form in what phase?
Prophase 1 of meiosis 1
Tetrads move to the middle of the cell in what phase?
Metaphase 1 of meiosis 1
tetrads are attached to each side of the cell by spindle fibers in what phase?
Anaphase 1 of meiosis 1
breaks form and physically interacts with each other through crossing over.
Two new cells are formed containing 3 chromosomes in each
Has one round and ends with 2 diploid daughter cells
Haploid cells do not occur during what cell cycle?
Has two rounds and ends with 4 haploid daughter cells
Both mitosis and meiosis
one cell division
two cell divisions
Synapsis and crossing over
only occurs in meiosis
Daughter cells, genetic composition in mitosis?
Two diploid, identical to parent cell
Daughter cells, genetic composition in meiosis?
four haploid, different from parent cell and eachother
Role in multicellular body of mitosis?
Produces cells for growth and tissue repair
Role in multicellular body of meiosis?
What three mechanisms contribute to genetic variation?
- Independent assortment of chromosomes
- Crossing over
- Random Fertilization