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Diploid & Haploid Cells

Kimball Biology

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n

n = the number of types of chromosomes a cell has

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Diploid: Definition

2n, means there are two of each type of chromosome (2 sets)

  • In this cell, n = 2, so 2x2 = 4 chromosomes for a diploid cell
  • In humans, n=23, so 2x23=46 chromosomes for a diploid cell

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Homologous Chromosomes

  • A pair of (set of 2) chromosomes of the same type (size)

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Somatic Cells

  • Name for a diploid body cell
  • Produced by MITOSIS

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Picture 1

Use any color for blue, any color for purple (just be consistent!) In the box below, write:

  • 2n – Diploid

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Then, Label the homologous chromosomes in picture 1

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Picture 2

Use the same colors as you did in picture 1

Label the homologous chromosomes

  • Still DIPLOID

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Haploid

n, means there is only one set of each type of chromosome.

  • In this cell, n = 2, so a haploid cell has 2 chromosomes
  • In humans, n = 23, so a haploid cell has 23 chromosomes

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Gamete

  • Name for a haploid sex cell (sperm OR egg)
  • Produced by MEIOSIS

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Picture 3

Use the same color scheme as the other pictures

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Under the picture, label the cell:

n - Haploid

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Types of ORGANISM Reproduction

COPY THE FOCUS QUESTION UNDER THE TITLE:

  • We’ve been discussing how individual cells reproduce….BUT how do entire organisms reproduce?
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Asexual Reproduction

  • Making of offspring that requires only ONE parent
  • Results in clones (offspring identical to parent)
  • NO VARIATION in offspring
  • EXAMPLES:

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Sexual Reproduction

  • Making of offspring that requires gametes from TWO parents
  • Results in offspring different than both parents
  • Requires MEIOSIS to produce gametes (sex cells)
  • Requires FERTILIZATION to unite gametes
  • VARIATION in offspring, necessary for Evolution
  • EXAMPLES:

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Sexual Reproduction

  • FERTILIZATION
  • Include a sketch of
  • this process in your
  • notes

Haploid

Haploid

Diploid Zygote

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Zygote

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For more help:

YOU TUBE:

�Reproduction (Part 1) Sexual vs. Asexual

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http://www.youtube.com/watch?v=QtGoqcs3fQs