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What is a diploid?
(2N) a cell haveing two sets of chromosomes 1 from mom and 1 from dad
what is a haploid?
(1N) a cell having one set of chromosomes a sex cell (egg or sperm)
What is Mitosis?
- division of diploid parent cell into two identical diploid daughter cells.
- Occurs during growth and asexual reproduction
what is meiosis?
- division of diploid parent cell into four different haploid gamete cells
- occurs during sexual reproduction to produce egg or sperm
what are the four phases?
- P=prophase (paired)
- M= Metaphase (middle)
- A= anaphase (apart)
- T= telophase (two cells)
what is cytokinesis?
cell plate forms between the new cells (cell wall plus middle lamella)
what is chromatin?
daughter chromosomes become longer, thinner...then indistinguishable
what gametes are produced in plants as a result of meiosis?
four different haploid gametes
what is prophased?
the chromosome pair have copied themselves Paired
what is metaphased?
middle=chromosomes align at the metaphase plate along the cent or equator of the cell
what is anaphased?
apart=sister chromatids of each chromosome pair separate as they are pulled to opposite poles
what is telophased?
two cells=saughter chromosomes surrounded by a new nuclear envelop and become longer thinner nucleoli reapper
what is chromosome?
a nuclear body containing genes in a linear order
what is chromatid?
the half chromosome during prophase and metaphase of mitosis, and between prophase I and anaphase II of meiosis
what is centromere?
the region of a chromosome that binds to the spindle during mitosis
what is the division I (Meiosis)?
- reductive division
- Prophase I
- Metaphase I
- Anaphase I
- Telophase I
what is the division II (meiosisII)
- equational division
- Prophase II
- Metaphase II
- Anaphase II
- Telphase II
what is crossing over?
chromosomes pairs may exchange parts with each other
what is chiasma (chiasmata)?
where crossover occurred
Prophase? Prophase I? Prophase II ?
- paired and copy themselves(mitosis)
- Prophase I=meiosis I redutive division
- Prophase II = meiosis II equaitonal division