HSC Biology Question Thread

[sidzeman]

Ohhhh so Boveri didn't link chromosomes to carriers of inheritance - he only observed offspring get one from each parent? I had it written down as part of Boveri's work
Also how did Sutton infer that not all characteristics followed Mendel's law of independent assortment?

[Natasha.97]

Ohhhh so Boveri didn't link chromosomes to carriers of inheritance - he only observed offspring get one from each parent? I had it written down as part of Boveri's work
Also how did Sutton infer that not all characteristics followed Mendel's law of independent assortment?

Hi!

For Boveri, the chromosomes are the carriers to inheritance (the offspring inherited the chromosomes, and therefore the characteristics from each parent) and the latter statement should be the other way round (i.e. Sutton did infer that they followed independent assortment).

Sorry for any confusion :/

[bigsweetpotato2000]

Hey!
Can someone explain this question to me why it's answer B?

Thanks

[Opengangs]

Hey!
Can someone explain this question to me why it's answer B?

Thanks

Hi, bigweetpotato2000!

When we're exposed to changes within the ambient environment, our body attempts to maintain constant homeostasis (important to note from MAB). Thus, blood circulation (vasodilation and vasoconstriction) become the essential elements to homeostasis. In penguins, they are no different.

When penguins are exposed to the cold air, their core body attempts to maintain that level of constant stability, meaning that vasoconstriction is taking place outside of that core body (ie there will be less blood flow to the extremes, such as hands and feet).

Conversely, when penguins are exposed to the hot air, their core body will still attempt to maintain that level of homeostasis, which means there will be a rush of blood flow towards the extremities (vasodilation).

[bigsweetpotato2000]

Hi, bigweetpotato2000!

When we're exposed to changes within the ambient environment, our body attempts to maintain constant homeostasis (important to note from MAB). Thus, blood circulation (vasodilation and vasoconstriction) become the essential elements to homeostasis. In penguins, they are no different.

When penguins are exposed to the cold air, their core body attempts to maintain that level of constant stability, meaning that vasoconstriction is taking place outside of that core body (ie there will be less blood flow to the extremes, such as hands and feet).

Conversely, when penguins are exposed to the hot air, their core body will still attempt to maintain that level of homeostasis, which means there will be a rush of blood flow towards the extremities (vasodilation).

Ahhhhhhhhhh.... But isn't blood flow linked to metabolic processes? I thought increase of metabolic processes increases heat production?

[bigsweetpotato2000]

Biological Familia,



Would Question 14, would it be C or D

C could be a potential answer if the heart suddenly gets rejected a long time after operation then the person dies pretty damn quickly?

D is the normal answer if the immune system is weak after the antibiotics right?


Bigsweetpotato Farm

[blasonduo]

Biological Familia,



Would Question 14, would it be C or D

C could be a potential answer if the heart suddenly gets rejected a long time after operation then the person dies pretty damn quickly?

D is the normal answer if the immune system is weak after the antibiotics right?


Bigsweetpotato Farm

Hello!

Your answer for C is absolutely correct! If these suppressor drugs weren't used, the body will continue to attack the patient!

D is wrong because Anti-biotics aren't needed until a disease is present. Suppressor drugs do lower immune defence, but it does not mean that there is a constant threat of an infectious disease. Also, most antibiotics are specific to certain bacteria, so applying before any symptoms is a very bad idea. Also, this constant use will cause an imbalance of microflora in the body and can cause thrush. ALSO ALSO, the constant feed of antibiotics is a bad idea due to natural selection, where the constant intake of antibiotics can cause a strain of bacteria to be resistant.

So for the best answer, I would go C

Hope this helps

[bigsweetpotato2000]

Hello!

Your answer for C is absolutely correct! If these suppressor drugs weren't used, the body will continue to attack the patient!

D is wrong because Anti-biotics aren't needed until a disease is present. Suppressor drugs do lower immune defence, but it does not mean that there is a constant threat of an infectious disease. Also, most antibiotics are specific to certain bacteria, so applying before any symptoms is a very bad idea. Also, this constant use will cause an imbalance of microflora in the body and can cause thrush. ALSO ALSO, the constant feed of antibiotics is a bad idea due to natural selection, where the constant intake of antibiotics can cause a strain of bacteria to be resistant.

So for the best answer, I would go C

Hope this helps

Ya legennnndd - Thanks blasonduo!

[caitlinlddouglas]

Hey I was wanting to use the Snow Heath for my example to talk about how an Australian plant responds to temperature change (MAB) but i'm not sure how this , is a small prostate shrub which grows very slowly over the ground. Its slow growth rate and small leaves allows it to cope with the cold temperatures/temperature change?
THANKS:)

[Opengangs]

Biological Familia,



Would Question 14, would it be C or D

C could be a potential answer if the heart suddenly gets rejected a long time after operation then the person dies pretty damn quickly?

D is the normal answer if the immune system is weak after the antibiotics right?


Bigsweetpotato Farm

It'd be wise to note what immunosuppressive drugs actually do to prevent rejection of organ transplant.
Recall that blood groups require constant monitoring, because of the structures between each blood type.
For instance, the A blood type will develop Anti-B antibodies, and will have the A antigen. So, transplanting blood or organs with blood type B will be marked as foreign.

To counter this, doctors will usually prescribe the transplanted patient with immunosuppressant drugs to prevent further rejection. This is done by "suppressing" the production of both, B and T cells, which would usually attack the foreign particle. As such, this prevents rejection that would have been encountered without immunosuppressive drugs. However, this means that the patient is prone to pathogens.

[soha.rizvi1]

Hey, can someone please explain Mitosis to me?

[Natasha.97]

Hey, can someone please explain Mitosis to me?

Hi

Mitosis is the process of producing 2 identical daughter cells. There is a division of the genetic material within the nucleus (nuclear division)
Role:
- Growth of organism
- Repair of dead/damaged cells
- Ensures that daughter cells have the same number/kind of chromosomes to the parent cell

I've attached a table outlining the different stages.
Hope this helps

[Opengangs]

Mitosis is the process of cells dividing into two identical daughter cells. Undifferentiated (or stem) cells, such as somatic cells undergo this process in order to become differentiated, which they can then be specialised. The reasons why cells undergo mitosis is through growth and repair of damaged cells.

Further research on stem cells allow scientists to further investigate on the processes of mitosis.

[soha.rizvi1]

Hey,

What is the difference between Divergetn and convergent evolution?

[Sine]

Hey,

What is the difference between Divergetn and convergent evolution?

divergent evolution is where there is a single common ancestor where differences in the population arise due to chance, no gene flow between populations. As a result a new speices is formed.

Convergent is different species develop similar traits usually due to having to live in very similar environements.