Gametogenesis & Alternation of Generations

Cells That Become Gametes

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Certain cells undergo a special type of cell division to create gametes, called germ cells. What is this type of division called?

Mitosis

Meiosis

Binary fission

Budding

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Spermatogenesis and Oogenesis

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Gametogenesis: Two Meiotic Divisions Spermatogenesis Primary spermatocyte Meiosis I two secondary spermatocytes Meiosis II four spermatids (mature into spermatozoa) Oogenesis Primary oocyte Meiosis I secondary oocyte 1st polar body Meiosis II ootid → ovum 2nd polar body one functional egg (unequal cytoplasm division) Spermatogenesis divides cytoplasm equally, producing four equal sperm. Oogenesis divides cytoplasm unequally, producing one large egg.

Based on the diagram, how many functional sperm cells result from one primary spermatocyte after both meiotic divisions?

Four

Two

One

Eight

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Why Oogenesis Produces One Egg

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Why does oogenesis result in a single large ovum rather than four equal-sized cells, unlike spermatogenesis?

Because only one meiotic division occurs in females

Because polar bodies are produced through fertilization

Because cytoplasm is divided unequally during the meiotic divisions

Because the egg undergoes mitosis instead of meiosis

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Stages of Oogenesis

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The first meiotic division produces a smaller (1) and a larger secondary oocyte. During meiosis II, the secondary oocyte divides unequally, with less cytoplasm going to a second polar body, and more going toward the (2) that then differentiates into an ovum.

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follicle

first polar body

ootid

spermatid

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Comparing Egg and Sperm Size

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True or False: A human egg is significantly heavier than a single human sperm cell.

True

False

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From Haploid to Diploid

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When a haploid sperm cell fertilizes a haploid egg, what is the resulting cell called, and what is its chromosome status?

A diploid zygote

A haploid spore

A diploid gamete

A triploid embryo

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Alternation of Generations

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What term describes a life cycle, like the one shown above, in which an organism alternates between sexual and asexual reproductive strategies at different stages?

Parthenogenesis

Cloning

Alternation of generation

Gametogenesis

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Which Cells Can Undergo Meiosis

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True or False: Haploid cells can divide meiotically.

True

False

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Spores in Plant Life Cycles

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In plants with alternation of generations, haploid cells called (1) are produced through meiosis from a diploid organism. These cells then divide by (2), producing a haploid multicellular plant.

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gametes

spores

mitosis

meiosis

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An Exception: Gametes from Mitosis

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In certain plant species that are already haploid, how are their gametes produced?

By mitosis, since the cells producing gametes are already haploid

By meiosis, the same as in animals

By parthenogenesis

By fragmentation

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Classify as Haploid or Diploid

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Sort each structure or cell into the correct chromosome category

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Spores in Animals

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Do animals produce spores as part of their reproductive life cycle?

Only animals living in water produce spores

No, animals never produce spores

Yes, animals always produce spores

Yes, but only during metamorphosis

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Cells That Become Gametes

Correct Answer

Explanation

Spermatogenesis and Oogenesis

Correct Answer

Explanation

Why Oogenesis Produces One Egg

Correct Answer

Explanation

Stages of Oogenesis

Correct Answer

Explanation

Comparing Egg and Sperm Size

Correct Answer

Explanation

From Haploid to Diploid

Correct Answer

Explanation

Alternation of Generations

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Explanation

Which Cells Can Undergo Meiosis

Correct Answer

Explanation

Spores in Plant Life Cycles

Correct Answer

Explanation

An Exception: Gametes from Mitosis

Correct Answer

Explanation

Classify as Haploid or Diploid

Sort each structure or cell into the correct chromosome category

drag and drop the selected option to the right place

Correct Answer

Explanation

Spores in Animals

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Explanation

Quran Recitation

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