quick photosynthesis review quiz: photosynthesis...

BIOSC 10 ANNOUNCEMENTS 2/3

•  Quick photosynthesis review •  Quiz: photosynthesis

•  Today’s material: chapter 6, part 1 •  Wed 2/4: review Q followed by chapter 6, part 2 •  Mon 2/9: quiz covering chapter 6

PHOTOSYNTHESIS REVIEW

Light Reactions Calvin Cycle

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Products (1)?

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Where?

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?

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H2O + sunlight

Thylakoid membrane

Oxygen (O2)

ATP, NADPH

Carbon dioxide (CO2)

Stroma

Glucose (C6H12O6)

ADP, NADP+

CONCEPTS OF BIOLOGY

Chapter 6 REPRODUCTION AT THE CELLULAR LEVEL

WHAT IS CELLULAR REPRODUCTION? WHY WOULD CELLS NEED TO REPRODUCE?

http://brookeborel.com

A FERTILIZED EGG IS A SINGLE CELL THAT DIVIDES TO FORM A NEW MULTICELLULAR ORGANISM

A sea urchin begins life as a single cell that (a) divides to form two cells, visible by scanning electron microscopy. After four rounds of cell division, (b) there are 16 cells. After many rounds of cell division, the individual develops into a complex, multicellular organism, a (c) mature sea urchin.

FIGURE 6.1

A CELL’S COMPLETE SET OF DNA IS ITS GENOME

•  Where is the genome located/stored?

•  Do prokaryotes have a genome?

•  What is the genome made of?

•  Each species of eukaryote has a characteristic number of chromosomes

•  23 pairs of homologous chromosomes in a female human somatic cell

FIGURE 6.2

A CELL’S COMPLETE SET OF DNA IS ITS GENOME

•  Chromosomes in the nucleus (top) were removed from a cell during mitosis (right), and arranged according to length (left) in a karyotype arrangement

•  Chromosomes were exposed to fluorescent stains to distinguish them

FIGURE 6.2

A CELL’S COMPLETE SET OF DNA IS ITS GENOME

•  23 pairs = how many chromosomes in human body cells?

•  Are human body cells diploid (2n) or haploid (n)?

•  Are human sex cells (gametes) diploid or haploid?

FIGURE 6.2

A CELL’S COMPLETE SET OF DNA IS ITS GENOME

•  Homologous chromosomes

•  Gene •  Different versions

called alleles •  Locus (plural = loci) •  Examples of genes?

•  Where do the two copies come from?

FIGURE 6.2

FIGURE 6.2

FIGURE 6.3

•  Interphase (G, S, and G2) •  Mitosis •  Cytokinesis

The cell cycle is an ordered series of events involving cell growth and cell division that produces new daughter cells

Mitosis is divided into five stages plus cytokinesis

FIGURE 6.4

Video: https://www.youtube.com/watch?v=L0k-enzoeOM

Which of the following is the correct order of events in mitosis? a.  Sister chromatids line up at metaphase plate à kinetochore

attaches to mitotic spindle à nucleus re-forms and cell divides à sister chromatids separate

b.  Kinetochore attaches to mitotic spindle à sister chromatids separate à sister chromatids line up at metaphase plate à nucleus re-forms and cell divides

c.  Kinetochore attaches to mitotic spindle à sister chromatids line up at metaphase plate à kinetochore breaks apart and sister chromatids separate à nucleus re-forms and cell divides

MITOSIS!

Who?

What?

When?

Where?

Why?

How?