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I cracked open a large chicken egg this morning and out came thewhite, an egg yolk, and another fully-formed shelled egg. Anythoughts on why this happened?

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Irving Heathcote
Irving HeathcoteLv2
29 Sep 2019

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Related questions

I was walking through a park this afternoon and observed a fewbirds having fun flying around and it got me thinking why wouldnatural selection favour birds with flesh at all if it hinderstheir flight.

We started first with single-cell and micro-organismsflourishing the ponds and then they evolved into massive dinosaurs.It therefore seems, there are some unique reasons for growing tosuch a large size.

However, I thought it's counter intuitive because the large bodyslows down locomotion, requires lots of food and energy upkeep, isa big flesh target for predators, makes hiding ineffective.

Although it is obvious that the flesh protects the internalorgans, but it seems like a chicken and egg problem because withouta massive body, perhaps then there is no need for the internalorgans.

On a different perspective, perhaps those animals that evolvedwithout flesh are called plants.

That sums up my naive train of thoughts.

So, any expert can shed some light?


Zoonosis

DISCUSSION

1- While on a romantic getaway with your significant other on the beautiful southern coast of Italy, you enjoy lots of local fish. After too much Chianti, you show off to your new Italian friends how to eat fish ‘sashimi style’ (raw!). Within weeks you develop crippling explosive diarrhea which causes your significant other to question the entire relationship. What trematode infection is consistent with this scenario? What other pathology may be associated with this parasite.

2- Why do ants fear Dicrocoelium dendriticus?

3- Describe the process of egg production in trematodes

4- What is the difference between a ‘reservoir host’ and a ‘paratenic host’? Define both terms and describe the role of each in the life-cycle of a trematode.

5-

Megalodiscus temperatus is an interesting parasite that exhibits alternative life cycle strategies. Describe those strategies. What might be some costs and benefits associated with each strategy??


6- Trematodes have an excretory system that can be especially well developed in some larval trematode stages. In these larval stages, this system also has an osmoregulatory function. Describe the excretory system of trematodes and list those larval stages in which you would expect that system to have a osmoregulatory function, then explain why?

7- You go to Minnesota for summer vacation…why you would go there, I am not sure…but you go, and after an early morning swim in a local lake, you begin to itch and develop small red spots all over your body. Tell me the what, the who and the how

8- Which group is considered the sister taxa of trematodes? what evidence suggests that relationship?


9- Describe the pathology of Paragonimus westermaniand how we can become infected with this parasite

Describe the pathology of Clonorchis sinensis and how we can become infected with this parasite

Describe the pathology of Fasciolopsis buski and how we can become infected with this parasite

**For each answer, explain why when possible.**

1.) Cats contain a chromosome # of 2N=38. How many chromosomeswould be located in a maturing sperm in a feline testis, assumingthat the sperm has entered Meiosis II?

-76
-19
-38
-32

2.) A sperm is small and an egg is large. Why could this be? Canchoose more than one answer.

-Eggs need to be able to move completely outside of the mother forfertilization.
-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 acellular scale).
-Twins will results from eggs that have the same genetic materialoriginally.

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 othermethod.
-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 otheranimal species to us. In this part of the lab we'll be taking somereasonable precautions to make sure that we don't allow unduecontact between their parasites and the interior of our bodies. Whyare we more vigilant about zoonotic diseases for the Gametogenesislab?

-The samples are fresh (they were part of a living organism just aday before)
-The samples are from mammals, so their parasites are closerevolved to us
-We are using sharp tools and razor blades, making access into ourbloodstream potentially easier
-The samples are from warm-blooded animals which have similardiseases to ours

5.) Echinarachnius parma (the common sand dollar) releases largeamounts of sperm and oocytes into the water. To avoid wasting spermwhenever possible, these gamete cells will not self-fertilize. Thismeans that you (Choose one):

-Will need to use sperm and eggs from different individuals inorder 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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