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introduction to the case of the mysterious snake

Introduction to theCase of the Mysterious Snake

To preserve the animations, please be sure to work through the slide show before editing; movements will not appear on the slide itself – only during a slide show

Notes about what to say are included on the slide notes area

professor chiszar s b ig s urprise
Professor Chiszar’sBig Surprise

I had a photo of Prof. Chiszar in his lab, but the url is no longer available – I suggest adding a photo of someone handling snakes in a lab setting

snakes

Include a nice photo of a timber rattlesnake

timber rattlesnake crotalus horridus

For a nice photo, see:

http://animals.timduru.org/dirlist/snake/TimberRattlesnake_01-OnSand.jpg

Timber rattlesnakeCrotalushorridus

http://animals.timduru.org/dirlist/snake/TimberRattlesnake_01-OnSand.jpg

timber rattlesnake crotalus horridus1
Timber rattlesnake: Crotalushorridus

For a nice video see

http://www.youtube.com/watch?v=EMaBH7EKYMU The newborn snake pops out at about 2:30 on the video

http://www.youtube.com/watch?v=EMaBH7EKYMU

timber rattlesnake crotalus horridus2
Timber rattlesnake: Crotalushorridus

For an interesting video see:

http://www.youtube.com/watch?v=y7B8L47jPD0

http://www.youtube.com/watch?v=y7B8L47jPD0

professor chiszar s big surprise
Professor Chiszar’s big surprise

For an nice photo see:

http://www.bbc.co.uk/nature/adaptations/Ovoviviparity

http://www.bbc.co.uk/nature/adaptations/Ovoviviparity

one more surprise
One more surprise!

It’s a boy!

where do babies come from
Where do babies come from?
  • Ultimately: from cells
  • How do cells reproduce? Mitosis
a primer on basic features of mitosis meiosis

A Primer on Basic Features of Mitosis & Meiosis

To preserve the animations, please be sure to work through the slide show before editing

mitosis
mitosis
  • Metaphase: homologous chromosomes independently line up
  • Produces two genetically identical nuclei (two genetically identical daughter cells after cell division)
slide12

nucleus

cell

nucleus

slide16

nucleus

Original

nucleus

Daughter

nucleus

Daughter

nucleus

well where do baby snakes usually come from
Well, where do baby snakes usually come from?

For a nice photo of fertilization, see

http://www.webmd.com/baby/ss/slideshow-conception

http://www.webmd.com/baby/ss/slideshow-conception

meiosis
meiosis
  • DNA replicates once, but cell divides twice
    • First meiosis: duplicated, homologous chromosomes pair up at metaphase so each cell gets one set of duplicated chromosomes
    • Second meiosis: duplicated chromosomes line up independently at metaphase so each cell gets one sister chromatid (i.e. all cells are haploid and have only one copy of each chromosome)
  • Produces gametes with one set of chromosomes
    • Four gametes (sperm) or one big gamete (egg) & three tiny cells called polar bodies
slide20

cell

nucleus

nucleus

slide24

nucleus

nucleus

nucleus

nucleus

slide26

Mitosis

Meiosis

Cell division

Cell division

Cell division

Cell division

Cell division

2X

slide28

X

Y

XY, male

slide29

X

Y

slide30

X

X

Y

Y

slide31

X

X

Y

Y

slide32

X

X

X Y

Y

Y

Y

X

X

Y

slide33

Mitosis

Meiosis

Genetic Sex

Determination

In Mammals

X

X

X

X

X

Y

Y

Y

Cell division

Cell division

X

X

X

X

X

X

X Y

Y

Y

X X

Cell division

Cell division

Cell division

2X

X Y

X

X

Y

Y

X

X

X

X

slide34

Meiosis

Mitosis

Genetic Sex

Determination

In Birds,Reptiles

Z

Z

Z

Z

Z

W

W

W

Cell division

Cell division

Z

Z

Z

Z

Z

Z

W

W

Cell division

Cell division

Z W

Cell division

2X

Z Z

Z W

Z

Z

W

W

Z

Z

Z

Z

parthenogenesis in vertebrates
Parthenogenesis in Vertebrates
  • Production of offspring from unfertilized eggs
slide36

Some Variations in Vertebrate Reproduction

Parthenogenesis

Gynogenesis

Hybridogenesis

Homologs

A b a B

M1 M2

(P1 P2)

(P3 P4)

M1 M2

M1 M2

M1 P1

P1 P2

P3 P4

Defective

Meiosis

Defective

meiosis

Fertilization

Fertilization

Defective

meiosis

M1

M2

M1

P1 or P2

P3 or P4

Haploid egg (paternal genome eliminated)

Diploid egg

Paternal

genome

eliminated

Haplotype

Haplotype

M1 M2

M1 M2

M1

P3 or P4

Diploid egg

Development

Development

Development

M1 M2

M1 M2

M1 P3

or M1 P4

Diploid egg

Diploid egg

parthenogenesis in vertebrates1
Parthenogenesis in Vertebrates

Where might meiosis “go wrong” so that a diploid egg cell is produced?

slide38

Mitosis

Meiosis

A

A

A

A

A

A

B

b

b

B

AA, Bb

B

B

Cell division

Cell division

Genotype of

Diploid Parent

Cell

b

b

A

A

A

A

A

A

A

A

2X

A

A

b

b

B

B

B

B

b

b

Cell division

Cell division

Cell division

AA, Bb

A B

A B

A b

A b

A b

A b

A B

A B

slide41

A

A

b

B

AA, Bb

slide42

A

A

A

A

b

b

B

B

slide43

A

A

A

A

b

b

B

B

slide44

AA, Bb

A

A

A

A

B

b

A

A

AA, Bb

AA, Bb

b

b

B

B

slide46

A

A

B

b

AA, Bb

slide47

A

A

b

B

slide48

A

A

A

A

b

b

B

B

slide49

A

A

A

A

b

b

B

B

slide50

A

A

A

A

AA, Bb

b

b

B

B

A, b

A, b

A, B

A, B

slide51

A

A

A

A

AA, Bb

B

B

b

b

A, B

A, B

A, b

A, b

slide52

Mitosis

Meiosis

A

A

A

A

A

A

B

b

b

B

AA, Bb

B

B

Cell division

Cell division

Genotype of

Diploid Parent

Cell

b

b

A

A

A

A

A

A

A

A

2X

A

A

b

b

B

B

B

B

b

b

Cell division

Cell division

Cell division

AA, Bb

A B

A B

A b

A b

A b

A b

A B

A B