Meosis Flashcards
(22 cards)
Reproductive cells
called sex cells (gametes)
A chromosome
is a strand of DNA tightly wrapped around proteins
Your body cells (somatic) have
46 (23 pairs) of chromosomes
Your sex cells (gametes) have
23 chromosomes (no pairs)
Autosomes
Chromosome pairs 1-22
Sex chromosomes
pair #23 (X and Y) & determine sex in mammals
Males= XY
Males=
Females=
=XY
= XX
Examples of asexual reproduction
Mitosis and Meiosis
Binary Fission
What is this called
“Offspring are NOT identical to the paren”
Genetic variation
External fertilization- fish and frogs
Internal fertilization- mammals
are examples of what
sexual reproduction
What are the first steps of the cell cycle
Interphase
G1, S, G2
What are the second steps of the cell cycle
Mitosis
Prophase, Metaphase, Anaphase, Telophase
What are the third steps of the cell cycle
Cytokinesis
Division of the cytoplasm
What is the point of the checkpoint in the cell cycle
a point along the cell cycle, during which the conditions of the cell are assessed
If favorable conditions are NOT met, what may occur
apoptosis
G1-
growth and makes organelles
S-
make a copy of DNA
G2-
growth and makes proteins
need to add prophase and metaphase and anaphase and telophase
Cytokinesis
period of division that results in two identical daughter cells
Meiosis
cell division that creates 4 genetically different daughter cells (23 chromosomes in humans)
Synonym for body cells
Somatic cells
