Chapter 10: Meiosis and the Sexual Life Cycles (10.2 Fertilization and…
Chapter 10: Meiosis and the Sexual Life Cycles
10.3 Meiosis reduces the number of chromosome sets from diploid and haploid
process that occurs after interphase I where proteins of eukaryotic cells are grown.
4 steps of meiosis I
homologous pairs of chromosomes align at the center of the cell
one chromosome of each homologous pair is pulled towards each pole
chromation is condensed into chromosomes
occurs during prophase I and metaphase I. The exchange of different segments of homologous chromosomes to increase genetic diversity.
protein structure that forms between homolgous chromosomes during meiosis
paired homologs that become physically connected to each other along their lengths by zipper-like proteins
Second step of meiosis. Four stages will repeat again.
10.4 Genetic variation produced in sexual life cycle contributes to evolution
when the crossing over of DNA from the 2 parent cells combine to create a single chromosome
10.2 Fertilization and meiosis alternate in sexual life cycle
any cell of a multicellular organism that is not a sperm or egg cell.
a cell that contains 2 sets of chromosomes (1 from each parent)
a cell with only 1 set of chromosomes that aren't paired
the visual appearance of chromosomes and organizing them by size and shape
a chromosome pair, one from each parents, that have similar length, position, and staining pattern
when chromosomes pair up during meiosis, the chromosome pairs are homologous pairs
: a chromosome not directly involved in determining the sex of an organism
chromosomes that determine the sex of an individual organism. (X and Y)
cell division that reduces the number of chromosomes by 1/2 and results in the formation of gametes
a union of gametes that forms by fusion of nuclei
the result of fertilization-gamete w/ 2 haploid sets of chromosomes with genes from paternal and maternal lines
is the generation-to-generation sequence of stages in the reproductive history of an organism from contraception of production
alteration of generations:
a life cycle where there is a multicellular diplod form and a multicellular haploid form
10.1 Offspring acquire genes from parents by inheriting chromosomes
a specific unit of hereditary information made of specific DNA or RNA sequences
space on a chromosome where a specific gene is located.
meiosis produces haploid gametes (ova or sperm) that contain one set of 23 chromosomes.
When 2 gametes fuse, the resulting zygote is once again diploid, with the maternal and paternal parent each contributing 23 chromosomes.
offspring are created by only one organism and the only genes inherited are an exact copy of the parent.
a group of identical cells that are derived from the same cell.
when 2 parents make offspring that have unique combinations of inherited genes from parents via the gametes.