So where should we start?

Cellular Division - mitosis

* What are some of the major differences in the cell division of prokaryotic cells compared to eukaryotic cells is?

* Prokaryotic chromosomes do not separate along a mitotic spindle like eukaryotic cells, others?

Cellular Division – mitosis in eukaryotes

A plant cell has 12 chromosomes at the end of mitosis. How many chromosomes did it have at the beginning of the cell cycle?

C. 12

Cellular Division – mitosis in eukaryotes

How many chromatids would the plant cell with 12 chromosomes have in the G2 phase of its cell cycle?

D. 24

Cellular Division - mitosis

Humans have a 2n number of 46. How many chromosomes would be found in each of the following?A. Somatic cells = B. Gametes =

Cellular Division - meiosis

The restoration of the diploid chromosome number after halving in meiosis is due to

* fertilization

Cellular Division - meiosis

Cellular Division - meiosis

Homologous pairs?

Cellular Division - meiosis

Cellular Division - meiosis• One homologous pair has ____

number of sister chromatids?

Cellular Division - meiosis Each sister chromatid has their

own kinetochore

Cellular Division - meiosis

27. The restoration of the diploid chromosome number after halving in meiosis is due to

B. fertilization

Is this organism homozygous or heterozygous? How do you know?

Heterozygous dihybrid cross L= long ears l = short ears R = red fur r = white fur Long eared, white fur offspring

are eaten more readily by predators. Bummer.

Evolution

Long eared, white fur offspring are eaten more often by predators.

Let’s assume that all of the offspring of a population with the above stated phenotype got eaten.

What effect does this have on the population?

Evolution

Nature selects based on phenotype but the impact is at the level of genotype.

• Bacteria are more and more resistant to antibiotics. Why?

• Directional selection by the way

Evolution

Evolution

Darwin proposed that new species evolve from ancestral forms by the gradual accumulation of adaptations to changing environments

Explains our unity and diversity

Evolution

Explain natural selection

the reproductive success of the members of a population best adapted to the environment

Cell Parts and Function

ReviewTYPICAL ANIMALCELL

Cell Parts and FunctionsReview Continued

TYPICAL PLANT CELL

Endomembrane System