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Sexual Reproduction Lesson PowerPoint Presentation

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Sexual Reproduction Lesson Presentation Transcript

Slide 1 - Quick Review - Meiosis - division of cells which results in the production of gametes Gametes - also known as sex cells, germ cells, or spores; cells of sexual reproduction, which contain only half the chromosomes of a normal cell highered.mcgraw-hill.com/sites/0072549238/ student_view0/glossary.html Chromosomes - Threadlike bodies found in the nucleus, or center part, of a cell that carry the information of heredity. www.sharedexperience.org/Glossary.lasso
Slide 2 - Sexual Reproduction Definition: Process in which two cells, termed gametes, come together to form one fertilized cell that contains genetic information from both parental cells. ucbiotech.org/glossary/ Production of offspring whose genetic constitution is a mixture of that of two potentially genetically different gametes. evolution.unibe.ch/teaching/GlossarE.htm
Slide 3 - Q: How many of you have more than one parent? then, everyone in this room is a product of sexual reproduction AnimationFactory.com
Slide 4 - Characteristics of Sexual Reproduction Requires a female and male parent (i.e. it takes two to tango)
Slide 5 - Q: Why do we need more than 1 parent? ½ + ½ = 1
Slide 6 - Characteristics of Sexual Reproduction Requires a female and male parent Each parent donates ½ of the Chromosomes/Genes/DNA
Slide 7 - So, by what we’ve discussed, in sexual reproduction “mom” donates half, and “dad” donates half. How does this happen?
Slide 8 - Characteristics of Sexual Reproduction Requires a female and male parent Each parent donates ½ of the Chromosomes/Genes/DNA Requires fertilization - the combining of gametes
Slide 9 - Now, nine months later, you come out kicking and screaming (and dancing). To which parent do you look exactly alike? How about your siblings? Do you look exactly alike them? Take a moment to write down one trait that is different and in what way it is different. *Dancing baby graphics and music courtesy of MegaBaby.com*
Slide 10 - Characteristics of Sexual Reproduction Requires a female and male parent Each parent donates ½ of the Chromosomes/Genes/DNA Requires fertilization - the combining of gametes Produces genetic diversity - variation among and within species that is attributable to differences in hereditary material. www.for.gov.bc.ca/hfd/library/documents/glossary/G.htm
Slide 11 - Now, lets talk about this diversity. My sister has a big nose. She’s not too thrilled with having this big nose. So let’s try to convince her it’s a good thing. Write down a reason it might be good to have a big nose.
Slide 12 - Possible Reason: Let’s run with the answer that she would have a better ability to pick up the scent of food. What would happen if the food supply suddenly decreased and no one, including my sister, had a big nose that could sense this food supply?
Slide 13 - EXTINCTION!!!! But, my sister does have a big nose. So the human species is saved. Kinda makes big noses pretty attractive now, doesn’t it?
Slide 14 - So what can we conclude about Sexual Reproduction? it produces diversity diversity ensures survival of a species in an environment that changes
Slide 15 - This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.
 

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