Gametogenesis & Alternation of Generations

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

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?

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

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.

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

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

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?

True or False: Haploid cells can divide meiotically.

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.

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

Sort each structure or cell into the correct chromosome category

Sort each structure or cell into the correct chromosome category

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