My Science Teacher said something I do not particularly agree with....

[LittleChickenRacingTeam]

Since this post is about innacurate statements...

Angie n Maine wrote....Also chicks don't develop from the yolk, they develop from the egg white. The yolk serves as a placenta.

Actually the sperm from the rooster enters the germinal disc or blastodisc that is attached to the yolk. The cells then begin to divide, if the egg is incubated at the correct temp. The yolk itself is NOT like a placenta, it is food for the embryo. Unlike the placenta in mammals which delivers nutrients & removes waste.

The fertilized blastodisc (now called the blastoderm) grows and becomes the embryo. As the embryo grows, its primary food source is the yolk. Waste products (like urea) collect in a sack called the allantois. The exchange of oxygen and carbon dioxide gas occurs through the eggshell.

 

[patandchickens]

Former university professor (biology) speaking here... first, are we sure that dye injected into a yolk *wouldn't* tint the chick that color? I haven't seen anyone address that question. I could imagine it either way, and have no idea what the actual truth is.

As far as "correcting" the science teacher (this is jr high or high school here, right?) I would really recommend against it unless the original poster has a good rapport with the teacher. I am not in the least surprised that a science teacher should get something wrong -- K-12 teachers really don't get all that much education in their actual subject matter (which frankly is so broad it'd be hard for them TO be expert in it all!). And who among us has never repeated something plausible from a supposedly informed source and called it fact? In a perfect world, teachers are glad to be set straight and will make sure to spread the word on the correction. However we do not necessarily live in a perfect world.

It's really important here that Dinos has had the guts and brains to RECOGNIZE that the science teacher said something unlikely, and think about it in more depth. Dinos - KEEP DOING THIS, it a Very Useful Life Skill and the mark of a sharp cookie

However it is also a Very Useful Life Skill to learn when it is better to keep your mouth shut

It's not necessarily practical, constructive or useful to go around correcting everyone everytime they trip up. This here is probably one of those cases where the game is not worth the candle. Not to say that Dinos mightn't mention how baby chicks actually work to his friends in the class, with appropriate rolling of eyes <grin>. But since the sad fact of life is that jr high and high school grades DO affect a person's later life to some extent, and a teacher CAN kinda screw you if they take an irrational dislike to you... you know?

Not everyone is educable at every arbitrary moment in time

Congrats to Dinos on having AND USING a brain <g>, and still idly wondering about the dye thing,

Pat

 

[tiffanyh]

However it is also a Very Useful Life Skill to learn when it is better to keep your mouth shut

So true---I just figured that out in my mid twenties!! Het, better late than never!

 

[silkiechicken]

From doing quite a few things with chick embryos.... I would have to say that ink injected into the yolk and doesn't leak out, will end up adsorbed into the chick when it adsorbs the yolk and subsequently tint the first chick poo's. If you die the albumen, you will get a colored chick as it stains the feathers. I've never seen a chick with India ink in the yolk turn up ink colored when hatched. Then again, at most is about 100 ul of ink per chick.

 

[herechickchick]

I found this on a 4-H website:

"About Colored Chicks: Coloring embryos by injecting dye into eggs before they hatch has been practiced for years. By dyeing the chicks, we can identify the young of certain hatches or groups. Some scientists use this method to observe movements of wild birds (especially birds like ducks) after they leave the nests.

By coloring chicks, we can study how the chick's feathers grow. The colored down (the fuzzy blue and green colors you see now) are replaced by juvenile feathers in about two weeks. You can see how the feathers change by watching the color pattern change on the baby chicks.

Dyeing by injection of the egg doesn't affect the chick's health, appetite, or growth."

Sounds like he is not completely off his rocker. Maybe he just got mixed up.

 

[Sharisr32]

ok this teacher has an email address or the school does- Being a Teacher What I want to hear IS the non-mentioned other side -- and to clarify this teacher's information.

 

[herechickchick]

Quote:
I agree, people seem to blasting this guy with out any regard to his side of the story.

 

[Sharisr32]

As a teacher you get use to it -- I am licensed to teacher allied health. We are as human as those we teach. I should also add some people Teach because they can ---It isn't an easy occupation and the first thing you learn is not every teacher can teach every student - that isn't because the teacher or the student is bad. It is a communication issue. Different learning styles...However if you are reading this I know at least one teacher you had was fair at their job

 

[lacyloo]

ur sience teacher is really dumb....

 

[silkiechicken]

Quote:
Now, anybody can be misinformed. You have to learn from somewhere so they may not know that much about chickens yet.