the production of offspring through meiosis and the union of a sperm and an egg
haploid male sex cells produced by meiosis
Formed in the female reproductive organs
joining of an egg and sperm
diploid cell formed when a sperm fertilizes an egg
of a cell or organism having two sets of chromosomes or twice the haploid number
describes a cell, nucleus, or organism that has only one set of unpaired chromosomes
a process in cell division during which the number of chromosomes decreases to half the original number by two divisions of the nucleus, which results in the production of sex cells
The first division of a two-stage process of cell division in sexually reproducing organisms that results in cells with half the chromosome number of the original cell.
the part of meiosis in which the two diploid cells split into four haploid cells
metaphase I- what happens?
chromosomes line up homologous pairs down the middle (MEIOSIS)
one of two identical strands into which a chromosome splits during mitosis
telophase I- what happens?
the cytoplasm divides, and two new cells form. Eachnew cell has one duplicated chromosome from each similar pair
anaphase I- what happens?
when the two pairs of chromatids of each similar pair move away from each other to opposite ends of the cell. Each duplicated chromosome still have two chromatids.
summary of meiosis
two cells form 2. in meiosis II, both of these cells form two cells. 3. the two divisions of the nucleus result in 4 sex cells. Each has 1/2 the number of chromosomes in its nucleus that was in the original nucleus. From a human cell with 46 chromosomes, meiosis produces 4 sex cells with 23 unpaired chromosomes.
mistakes in meiosis occur more often in plants or animal cells
mistakes can produce sex cells with too many or too few of what?
what happens to organisms with the wrong number of chromosomes?
they do not grow normally