Haploid and diploid cells – Plant reproduction

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haploid sperm cells: gray oval translucent cells with long thin tails (flagella)

Human sperm cells with flagella (under a microscope) – They’re haploid cells.

When a cell divides by meiosis, it ends up with only half the amount of DNA it had before. That is a haploid cell. When two haploid cells join together to make one new cell with the regular amount of DNA, that’s a diploid cell. All living creatures that use meiosis have to spend some time as haploid cells and then some time as diploid cells. Biologists call this “alternation of generations”, because you alternate being a haploid creature and being a diploid creature.

Some creatures spend most of their time as haploid cells, and only become diploid for a short time before quickly going back to being haploid again. For example, moss is a plant that is usually haploid and only diploid for a short time.

Other creatures spend most of their time as diploid cells, and only become haploid for a short time. They quickly go back to being diploid. Your cells are all diploid, except for sperm and egg cells. They are haploid, but you only spent a very short time as a haploid sperm cell and a haploid egg cell before they combined to make you a diploid baby. All pine trees and flowering plants also spend most of their time diploid, and only a short time haploid.

More about plant reproduction

Bibliography and further reading:

Spores
Plant reproduction
Pine trees
Flowering plants
Plants
Biology
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By |2018-04-13T17:05:53+00:00May 30th, 2017|Biology|0 Comments
Cite this page: Carr, K.E. Haploid and diploid cells – Plant reproduction. Quatr.us Study Guides, May 30, 2017. Web. September 24, 2018.

About the Author:

Dr. Karen Carr is Associate Professor Emerita, Department of History, Portland State University. She holds a doctorate in Classical Art and Archaeology from the University of Michigan. Follow her on Instagram, Pinterest, or Facebook, or buy her book, Vandals to Visigoths.

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