Meiosis #2

Meiosis #2

Crossing-Over, Law of Segregation, and Law of Independent Assortment

​Law of Independent Assortment

​Law of Segregation

Know the important events of Meiosis, their significance and the key differences between Meiosis I and Meiosis II

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​Gametes

​End - haploid (n)

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​Gamete

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​Gamete

​Gamete

​End: Haploid(n)

Multiple Choice

During which stage are homologous chromosomes separated?

• anaphase of Meiosis I

• during the process of Meiosis II

• anaphase of Meiosis II

• after the completion of Meiosis II

Multiple Choice

During which stage are sister chromatids separated?

• anaphase of Meiosis I

• during the process of Meiosis II

• anaphase of Meiosis II

• after the completion of Meiosis II

​Diploid (2n)

​Haploid (n)

​Homologous Pairs of Chromosomes

​Mendel's 2nd Law: Law of Independent Assortment:
random orientation of homologous chromosome pairs allow for gametes to have different assortments of homologous chromosomes

Occurs in Metaphase I

​sister chromatids are separated

​sex cells

Haploid (n)

​Haploid (n)

​Mendel's 1st Law: Law of Segregation
alleles segregate/separate, each gamete is equally likely to receive either one of the two alleles present in the diploid individual

Occurs in Anaphase I and II

Multiple Choice

During which stage are homologous chromosomes separated?

• anaphase of Meiosis I

• during the process of Meiosis II

• anaphase of Meiosis II

• after the completion of Meiosis II

Multiple Choice

During which stage are sister chromatids separated?

• anaphase of Meiosis I

• during the process of Meiosis II

• anaphase of Meiosis II

• after the completion of Meiosis II

Multiple Choice

_____________ - homologous pairs of chromosomes randomly, and independently orient along the middle of the cells add to genetic variation.

• Law of Segregation

• Law of Nature

• Law of Gravity

• Law of Independent Assortment

Multiple Choice

_____________ - alleles segregate/separate, each gamete is equally likely to receive either one of the two alleles present in the diploid individual

• Law of Segregation

• Law of Nature

• Law of Gravity

• Law of Independent Assortment

Know the important events of Meiosis, their significance and the key differences between Meiosis I and Meiosis II

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​Each chromatid gets a unique DNA sequence (different)

​Gamete Cells

Haploid (n)

​Diploid (2n)

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​Gametes

Multiple Choice

During which stage does the process of Crossing-over occur?

• During the completion of Meiosis II

• Prophase of Meiosis I

  (Prophase I)

• During the start of Meiosis II

• Prophase of Meiosis II

  (Prophase II)

Multiple Choice

Which process is occurring in the image?

• Crossing Over

• Law of Independently

• Law of Segregation

• Sister Chromatids separate

Multiple Choice

When crossing-over occurs, each chromatid ends up with ___________.

• a unique sequence of DNA

• the same sequence of DNA

• no sequence of DNA

• old combinations of DNA

Know the important events of Meiosis, their significance and the key differences between Meiosis I and Meiosis II

I Will...

Review the process of Meiosis and its significance to sexual reproduction

We Will...

Win for the Day!

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