Meiosis and Sources of Variation

Mitosis:

• Cell division that creates new body cells

• Cell division that creates new sex cells

Tags

NGSS.HS-LS1-4

Meiosis:

• Cell division that creates new body cells

• Cell division that creates new sex cells

SELECT ALL THAT APPLY: Gamete:

• A sex cell

• A body cell

• Sperm / egg cell

• ANY cell besides a sex cell (muscle cell, neuron, blood cell, etc.)

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

SELECT ALL THAT APPLY: Homologous chromosomes:

• Chromosome pairs with the same structure & genes

• 1 from mom, 1 from dad

• All from mom

• All from dad

Tags

NGSS.HS-LS3-1

SELECT ALL THAT APPLY: Diploid:

• Number of chromosomes in body cells

• Number of chromosomes in gametes

• 46 for humans

• 23 for humans

SELECT ALL THAT APPLY: Haploid:

• Number of chromosomes in body cells

• Number of chromosomes in gametes

• 46 for humans

• 23 for humans

Tags

NGSS.HS-LS3-2

Variation

• Differences between individuals

• Similarities between individuals

Tags

NGSS.HS-LS3-2

NGSS.HS-LS4-2

NGSS.HS-LS4-3

Variation is ALWAYS:

• Beneficial

• Neutral

• Harmful

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-4

Crossing Over:

• When chromosomes switch genes

• When chromosomes line up randomly during meiosis

• When a sex cell has the wrong number of chromosomes

Tags

NGSS.HS-LS3-2

Random Assortment / Independent Assortment:

• When chromosomes switch genes

• When chromosomes line up randomly during meiosis

• When a sex cell has the wrong number of chromosomes

Tags

NGSS.HS-LS3-2