Powerpoint Chapter 6 Flashcards
Only one parent
asexual
offspring are genetically identical to parent
asexual
Two types of reproduction
sexual
asexual
combine from two parents
Gametes
Gametes combine from two parents
Sexual
Offspring are genetically different from one another and from the parents
Sexual
_______ carries genes
DNA
must be copied before cells divide
Genetic Material
section of DNA with instructions for building all cell proteins
Genes
made of DNA wrapped around proteins
Chromosomes
in uncondensed, string-like form before cell division
Chromosomes
Carry hundreds of genes
Chromosomes
Sister chromatids; duplicated chromosomes, attached at the centromere
Chromosomes
Occurs before cell division
DNA replication
Begins by splitting helix in half (up the middle)
DNA replication
Newly formed DNA strand has one-half new daughter DNA and one-half conserved parental DNA
Semiconservative replication
The cell cycle has how many steps
3
DNA replicates in which cell cycle phase?
Interphase
Copied chromosomes are moved into daughter nuclei
Mitosis
Mitosis occurs in ________ or body cells
somatic
Parent cell splits into two daughter cells
cytokinesis
Three stages of the cell cycle are:
- Interphase
- Metaphase
- Cytokinesis
Interphase has ____ phases.
3
cell grows, organelles duplicate
G1
DNA replicates
S
Cell makes proteins needed to complete mitosis
G2
Most of the cell cycle is spent in _________>
Interphase
Three stages of interphase are:
G1
S
G2
Normal cells halt at ___________.
Checkpoints
________ determine the condition of the cell.
Proteins
______ must pass the checkpoints to proceed with cell division.
Cell
Three checkpoints are:
G1
G2
Metaphase
a change in the sequence of DNA
Mutation
May h=change the structure and function of the protein coded by the DNA
Mutation
Mutated suppressor genes can increase the likelihood of _______>
Cancer
May be inherited or caused by carcinogens.
Mutation
Are all the chromosomes attached to microtubules?
Metaphase Checkpoint
Is cell division necessary?
Is the cell large enough for G2?
G1 Checkpoint
Was DNA replicated correctly?
G2 Checkpoint