Mitosis and Meiosis (Unit 5 - Part 2) Flashcards
meiosis
cell division that makes sex cells for sexual reproduction
during meiosis, the DNA from 2 ______ gets _______
partner chromosomes gets mixed up or exchanged
crossing over
the exchange (mixing up) of DNA
why is there variation when it comes to sexual reproduction?
meiosis
gametes
sex cells (sperm and egg cells)
what creates gametes?
meiosis
end result of meiosis
-4 daughter cells that are genetically different to the parent cell. They contain the haploid number of chromosomes
-the daughter cells have half the number of chromosomes as the original parent cell
haploid
half the number of chromosomes
advantages of sexual reproduction
more variation, species are more likely to survive change in the environment
disadvantages of sexual reproduction
take more time and energy to reproduce, need to find a mate
in meiosis a diploid (2n) parent cell creates ___
four haploid (n) daughter cells
sexual reproduction involves the fusion of __
the nuclei of two sex cells (gametes)
fertilization
the fusion of two nuclei
How many chromosomes does the new nucleus of a new organism for a healthy organism to develop?
the correct number
zygote
the end result of fertilization of an egg and sperm cell and it has the diploid (2n) number of chromosomes
