Evolution/Ancestry
Modern organisms must show evidence of ?
Shared ancestry and relatedness
Steps of Mitosis
Prophase,Metaphase,Anaphase,Telophase
Meiosis ends with
4 haploid cells
Homozygous means
two of the same alleles
Dna sequences are encoded in
genes
The remains of past life forms must show evidence of
change and relatedness
Mitosis creates two
identical cells
Meosis occurs in the
Gonads (testes and ovaries)
Heterozygous means
two different alleles
DNA replication occurs during
Interphase ( S phase)
Modern organisms must show evidence of
continueing evolutionary changes
If a cell starts with 2N=6, How many chromosomes are in the end cells of mitosis?
6
crossing over occurs during?
Prophase 1
sequences of DNA, instructions for making proteins
alleles
List the steps of the cell cycle
G1 S G2 P M A T C
Example of evidence of shared ancestry and relatedness?(several answers)
-cell structures are the same
-cell processes are the same
-Biomolecules are the same
-Molecular processes are the same
-patterns of similarity and homology
Draw a cell 2N=4 at anaphase
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What seperates during Metaphase 1 of meiosis?
Homologous pairs of chromosomes
Draw a cell 2N=4 with the genotype AA in Late interphase
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Humans have how many pairs of chromosomes
23
Homology vs. Homoplasy
homology:sharing of traits beceause of ancestry
homoplasy:similarities not due to ancestry
How many sister chromatids does each chromosome consist of in metaphase of mitosis
two
Draw a cell 2N=6 during Metaphase 1 of Meiosis
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what gametes would be produced from a Cell that has a genotype Bb?
B
b
How many sister chromatids are present in a 2N=6 cell during prophase 1 of meosis?
12