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Reduction-Division
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Homologs separate

Slide 27

Telophase I

Telophase I

Each pole now has haploid (1n) set of chromosomes.

Cytokinesis occurs and two haploid daughter cells are formed.

Slide 28

Telophase I

Telophase I

cytokinesis

Slide 29

MEIOSIS II

MEIOSIS II

Sister Chromatids Separate

Meiosis II

Slide 30

Meiosis II

Meiosis II

No Interphase II or very short

No DNA Replication

Remember: Meiosis II is similar to mitosis

Slide 31

Prophase II

Prophase II

Same as Prophase in mitosis

Nucleus & nucleolus disappear

Chromosomes condense

Spindle forms

Slide 32

Metaphase II

Metaphase II

Same as Metaphase in mitosis

Slide 33

Anaphase II

Anaphase II

Same as Anaphase in mitosis

SISTER CHROMATIDS separate

Slide 34

Telophase II

Telophase II

Same as Telophase in mitosis.

Nuclei and Nucleoli reform, spindle disappears

CYTOKINESIS occurs.

Remember: FOUR HAPLOID DAUGHTER cells are produced.

Called GAMETES (eggs and sperm)

1n Sperm cell fertilizes 1n egg to form 2n zygote

Slide 35

Telophase II

Telophase II

Slide 36

Reduction-Division

Slide 37

Variation

Variation

Also known as GENETIC RECOMBINATION

Important to population as the raw material for NATURAL SELECTION.

All organisms are NOT alike

Strongest “most fit” survive to reproduce & pass on traits

Slide 38

Question:

Question:

What are the 3 sources of genetic recombination or variation?

Slide 39

Answer:

Answer:

CROSSING OVER (prophase I)

INDEPENDENT ASSORTMENT (metaphase I)

RANDOM FERTILIZATION

Slide 40

Question:

Question:

A cell containing 20 chromosomes (diploid) at the beginning of meiosis would, at its completion, produce cells containing how many chromosomes?

Slide 41

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