**For each answer, explain why when possible.** 1.) Cats contain a chromosome #
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Question
**For each answer, explain why when possible.**1.) Cats contain a chromosome # of 2N=38. How many chromosomes would be located in a maturing sperm in a feline testis, assuming that the sperm has entered Meiosis II?
-76
-19
-38
-32
2.) A sperm is small and an egg is large. Why could this be? Can choose more than one answer.
-Eggs need to be able to move completely outside of the mother for fertilization.
-Eggs are stationary and contain a supply of proteins, mRNAs, stored energy etc of the embryo-to-be.
-Sperm are motile, sometimes traveling considerable distances (on a cellular scale).
-Twins will results from eggs that have the same genetic material originally.
3.) Tons of organisms have evolved sex as a means of reproduction. Why? Tough question, choose the one most sensible answer.
-Sex helps an organism reproduce faster than any other method.
-Sex allows greater genetic variation in a population.
-Sex allows a species to mutate more accurately.
-Sex speeds up the rate of natural selection on a mutation.
4.) Zoonotic diseases are diseases that can be spread from other animal species to us. In this part of the lab we'll be taking some reasonable precautions to make sure that we don't allow undue contact between their parasites and the interior of our bodies. Why are we more vigilant about zoonotic diseases for the Gametogenesis lab?
-The samples are fresh (they were part of a living organism just a day before)
-The samples are from mammals, so their parasites are closer evolved to us
-We are using sharp tools and razor blades, making access into our bloodstream potentially easier
-The samples are from warm-blooded animals which have similar diseases to ours
5.) Echinarachnius parma (the common sand dollar) releases large amounts of sperm and oocytes into the water. To avoid wasting sperm whenever possible, these gamete cells will not self-fertilize. This means that you (Choose one):
-Will need to use sperm and eggs from different individuals in order to successfully fertilize the oocytes.
-Can use room temperature conditions.
-Don't need to worry where the oocytes came from.
-Should focus your microscope as quickly as possible.
Explanation / Answer
1.) Cats contain a chromosome # of 2N=38. How many chromosomes would be located in a maturing sperm in a feline testis, assuming that the sperm has entered Meiosis II?
-76
-19
-38
-32
sperm - haploid
2.) A sperm is small and an egg is large. Why could this be? Can choose more than one answer.
-Eggs need to be able to move completely outside of the mother for fertilization.
-Eggs are stationary and contain a supply of proteins, mRNAs, stored energy etc of the embryo-to-be.
-Sperm are motile, sometimes traveling considerable distances (on a cellular scale).
-Twins will results from eggs that have the same genetic material originally.
3.) Tons of organisms have evolved sex as a means of reproduction. Why? Tough question, choose the one most sensible answer.
-Sex helps an organism reproduce faster than any other method.
-Sex allows greater genetic variation in a population.
-Sex allows a species to mutate more accurately.
-Sex speeds up the rate of natural selection on a mutation.
4.) Zoonotic diseases are diseases that can be spread from other animal species to us. In this part of the lab we'll be taking some reasonable precautions to make sure that we don't allow undue contact between their parasites and the interior of our bodies. Why are we more vigilant about zoonotic diseases for the Gametogenesis lab?
-The samples are fresh (they were part of a living organism just a day before)
-The samples are from mammals, so their parasites are closer evolved to us
-We are using sharp tools and razor blades, making access into our bloodstream potentially easier
-The samples are from warm-blooded animals which have similar diseases to ours
5.) Echinarachnius parma (the common sand dollar) releases large amounts of sperm and oocytes into the water. To avoid wasting sperm whenever possible, these gamete cells will not self-fertilize. This means that you (Choose one):
-Will need to use sperm and eggs from different individuals in order to successfully fertilize the oocytes.
-Can use room temperature conditions.
-Don't need to worry where the oocytes came from.
-Should focus your microscope as quickly as possible.
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