1. Warm-Up (1/28)
Answer the following questions, and explain in a complete sentence why each answer is correct.
Name
Date
Period
An organism with two copies of the same allele is said to be:
Homozygous
Heterozygous
Phenotypic
Genotypic
If a DNA sequence is changed from TAC GGA CCC to TAC AGA CCC, how will the mRNA change? How will the amino acid sequence change?

2. Mitosis vs. Meiosis 2n 2n 4n 4n 4n 4n n n n n 2n 2n 2n 2n Mitosis
(diploid) 2n
(diploid) 4n 4n 4n 4n n n n n
(haploid) 2n 2n 2n 2n

3. Mitosis vs. Meiosis
Mitosis makes two identical daughter cells. good for asexual reproduction!
Better to have more variety.
Meiosis allows
sexual reproduction to happen.
More sex = more genetic variation.

4. “crossing over” increases genetic variation!
Mitosis vs. Meiosis 1m 1p 1p 2p 2m 1m 2p 2m 3p 3m 3p 3m 4m 4p 4m 4p
“crossing over” increases genetic variation!

5. T-Chart Mitosis Meiosis Number of cells starting with
Number of cells ending up with
Amount of DNA per cell to start
Amount of DNA per cell ending up
Makes gametes or somatic cells?
Which kind of reproduction?

6. Closure
Answer the following question in a complete sentence:
Name
Date
Period
Which is responsible for producing gametes: meiosis or mitosis? How is the amount of DNA different in a somatic cell versus a gamete?
Scale from 1-10