MeiosisMeiosis

Meiosis IMeiosis I

Meiosis IIMeiosis II

Meiosis IMeiosis I

• Interphase IInterphase I• Prophase IProphase I• Metaphase IMetaphase I• Anaphase IAnaphase I• Telophase ITelophase I

Meiosis IIMeiosis II

• Interphase IIInterphase II• Prophase IIProphase II• Metaphase IIMetaphase II• Anaphase IIAnaphase II• Telophase IITelophase II

MitosisMitosis

MeiosisMeiosis

Meiosis IMeiosis I

Meiosis IIMeiosis II

Diploid Cell 2N = 4Diploid Cell 2N = 4 Two Homologous Chromosomes Two Homologous Chromosomes

Interphase 1Interphase 1DNA is synthesized during the S phaseDNA is synthesized during the S phase

Prophase I: (1)The duplicated chromosomes Prophase I: (1)The duplicated chromosomes condense and become visible. condense and become visible. (2) Spindle forms.(2) Spindle forms.

(3) The nucleolus disperses(3) The nucleolus disperses(4) The nuclear membrane disperses(4) The nuclear membrane disperses

(5) Homologous chromosomes pair(5) Homologous chromosomes pair

(6) and cross over(6) and cross over

Metaphase IMetaphase IPaired homologous chromosomes align Paired homologous chromosomes align

at the metaphase plateat the metaphase plate

Anaphase IAnaphase IThe homologues separate from each other, but sister The homologues separate from each other, but sister

chromatids remain linked at their centromereschromatids remain linked at their centromeres

Telophase I: Cytokinesis that follows produces 2 Telophase I: Cytokinesis that follows produces 2 daughter cells, each has 2 chromosomes consisting daughter cells, each has 2 chromosomes consisting of 2 sister chromatidsof 2 sister chromatids

Prophase IIProphase II

Metaphase IIMetaphase II

Anaphse IIAnaphse II

Telophase IITelophase II

Identify the following phaseIdentify the following phase

Identify the following phaseIdentify the following phase

Identify the following phaseIdentify the following phase

Identify the following phaseIdentify the following phase

Question 1Question 1

Homologous chromosomesHomologous chromosomes

A.A. Pair up during meiosis Pair up during meiosis

B.B. Are in pairs, one chromosome of each pair Are in pairs, one chromosome of each pair comes from the father and one from the comes from the father and one from the mothermother

C.C. May exchange parts during meiosisMay exchange parts during meiosis

D.D. All the aboveAll the above

Questions 2 & 3 True/FalseQuestions 2 & 3 True/False

• Question 2: Asexual reproduction produces Question 2: Asexual reproduction produces variationsvariations

• Question 3: Sexual reproduction produces Question 3: Sexual reproduction produces variationsvariations

AnswersAnswers

• Question 1: DQuestion 1: D

• Question 2: FQuestion 2: F

• Question 3: TQuestion 3: T