Biology practical class

In the last class in the lab we tested the reaction of starch and amylase when it was mixed with iodine solution.First we had to put a drop of starch with a drop of iodine solution to see if iodine was working correctly, If it was working correctly the starch would change its collie to black or blue and if not it would stay the same.Then we mixed starch with amylase and put ten separated drops of it.Finally we put a little bit of iodine solution in the other drops every one minute.If the solution turned black it meant that amylase didn’t break down starch yet, however if the solution remained yellow it meant that amylase broke down starch into maltose.To verify that starch was broken down into maltose you could use Benedict because it would only cause a reaction in maltose but not in starch.

teacher blog with instructions:http://cadem.cumbresblogs.com/2019/08/20/amylase-and-starch/

Digestive system practical

Last class in the laboratory we did a simulation of the digestive system, by doing this we where able to see the process of  absorption, assimilation and the disposal of wastes.For this we used some plastic glasses, an orange, some little pieces of banana, a cracker, a scissor and a sock that acted like the small intestine and later on like the large intestine

Biology Practical Class

In the last biology class at the lab, we worked with digestive system.The activity we had to do consisted in wrapping some glucose solution  with cellophane paper and then  put it in a beaker. Then, we had to look for a test tube and add the water in it, add a solution and place it in boiling water. If the water became orange, it meant it had glucose and if it didn’t turn orange it meant it didn’t have glucose.Thanks to this procedure, we were able to understand how the small intestine works and it’s functions

Sickle cell anaemia + malaria

Today in biology class we watched a video and shared information about sickle cell anaemia and malaria.After this she asked us to do some activities and to take notes. I worked with Juana Navarro

Note Taking

-Sickle cell anaemia
Caused by a mutation
Changed shape of red blood cell
Genotype
HN HN normal haemoglobin
HN Hn some abnormal haemoglobin but it’s not going to be life threatening
Hn Hn abnormal haemoglobin and sickle cell anaemia that will be life threatening

-Malaria:
Transmitted through mosquitoes
Caused by a parasite that invaded red blood cells
HN Hn and Hn Hn are resistant to this disease because the parasite is unable to invade and to reproduce in sickle cell anaemia
HN HN is at higher rosca of contracting malaria in a malarial country
Both diseases concise in tropical areas because of the selective advantage of th Hn allele in providing protection against malaria

3 ideas:

-Hn Hn is more life threatening  than malaria

-Natural selection helps HN Hn to survive against malaria and sickle cell anaemia

-Sickle cell anaemia happens when oxygen concentration is low causing the faulty haemoglobin to produce fiber that will pull red blood cells into a sickle shape and get stucked in the capillaries

2 question

-which are the places that are most infected by malaria?

-Which is the treatment of sickle cell anaemia?

1 metaphor

-sickle cell anaemia is a disease that will make you drown slowly

Note taking

Today our teacher explained us about sickle cell anaemia and about selective breeding.Then she asked us to take notes.

Sickle cell anaemia
-HbA:codes for normal haemogllbin
-HbS:faulty type in haemoglobin
-Sickle cell crisis:when HbS produces fiber inside blood cells when oxygen concentration is low causing the red blood cells to be pulled in a sickle shape and get styled in blood capillaries
-The two alleles are codominant
-HbA HbA:normal haemoglobin
-HbA HbS:mix of normal and sickle cell hadmoglobin
-HbS HbS:sickle haemoglobin
-Malaria:caused by a single-celled parasite that is injected in the blood by mosquitoes
-HbS HbA:were more resistant to malaria

Selective breeding
-The breeder choose es the individuals with characteristics he or she wants to be passed to their offspring and let just them breed(Artificial selection)

-If this process is repeated over many generations, these characteristics will be more common than they used to be

Darwin,Lamark and Wallace

Today at biology class we were told to do some activities about evolution.I worked with Juana Navarro

1a)Most birds don’t prey on the Hypolimnas because they are similar to Amauris which have an unpleasant taste and because of it birds assume that Hypolimnas are Amauris so they don’t prey them.

1b)The wings of Hypolimnas changed over the generation thanks to mutations that helped them to survive.This way animals don’t prey on them because they think they are Amauris which has an unpleasant taste.The ones that didn’t have this mutations were eaten by other animals.

2a)What Lamark would have said is that the sword fish sword got longer  through their lifetime because they used it to protect themselves from predator and this acquired caracteristics were passed to their offsprings when they reproduced

2b)Darwin would say that over the generations the sword fish had some mutations such as their sword that got longer and thanks to this they were able to survive while the ones that didn’t have this mutation died.Later on this mutation was passed tho their offsprings

3a)Lamarck would say that as the giraffes needed to eat the leaves of the trees, they needed to have a long neck to reach the leaves. That’s why he would explain that since the giraffes stretched their neck so much to reach their food, and it would grow, so when they would reproduce they new organisms would have a neck that would be getting longer and longer.

3b)Darwin would say that as giraffes couldn’t reach trees, thanks to mutation, when reproducing, the new organisms would start having longer and longer necks than their ancestors to survive.

4)Over generations mammoth were able to evolve thanks to mutations.The mammoths that mutate were able to survive to colder places thanks to their fur and the ones that didn’t mutate died because of the low temperature  so the ones that survived reproduced and passed their mutation to their offspring

 

 

Variation and Adaptation

In our last Biology classes, we have been working with variation and adaptation.Then we were told to do some activities from our teacher’s blog.This are the answers to the activities.I worked with Emilia Varela

-What i learnt today:

What is variation when it helps an organism to survive?

How does the enviroment affects variation?

What are the differences between variation, adaptation and mutation?

How does an organism variate?

-Video 1:

Author:Steve Pratt

-Video 2:

Author:Mr Pollok

Bibliography/sources:AQA AS unit 2 Biology students

-Video 3:

Author:Mr Fox’s Science classrom

-These videos are linked to Geography since they talked about how species adapt to different enviroments and History because they say that they evolved through the years, what relates it with History since it happened millions of years ago.

-Three things featured in all birds are:feathers,wings and beak.

-Headline:

-Video 1:Organism’s Mutation

-Video 2:Why Organisms Variate

-Video 3:How Variation Becomes Adaptation

scientific method

Question: When is the best time to go to the grocery store to avoid lines?

Hypothesis: I thought that the best time to go to the grocery store is at 8pm, at this time it should be easier to avoid lines.

Experiment: I went to the grocery store at different hours and counted how many people were at the line.

Results: I analyzed the results of the experiment and finally got to a conclusion

Conclusion:The experiment showed that the hypothesis was right and that 8pm is the best time to avoid lines at the gorcery store.

Communicate the results:We discussed the results at the class

Lab safety rules

Today in the lab we saw a video about safety lab rules and then we chose our own safety rules:

1.Don’t run inside

2.Be tidy, avoid rubbish around

3.Avoid long sleeves

4.Hair must be tied up

5.Neve eat or drink inside

6.Let teacher know when glass material is broken

7.wear gooogle in the correct way

8.Never smell substances directly

9.whean heating substances or liquids keep test tubes with their opening away from people

10.Never refillthe original container with the substance.Just discard it