VCE Biology Question Thread

[Reus]

Do you have any other guesses? 

They've all been asked before but

~Meiosis or Mitosis
~DNA Replication
~Enzyme inhibition/rational drug design
~Antibody First and Secondary Response Graphs
~Allergic Response
~Plasma Membrane

[DJA]

They've all been asked before but

~Meiosis or Mitosis
~DNA Replication
~Enzyme inhibition/rational drug design
~Antibody First and Secondary Response Graphs
~Allergic Response
~Plasma Membrane

<3

[psyxwar]

No. You can have protein hormones that are essentially amino acid derivatives which would definitely not have a quaternary structure:

Amino Acid Derivatives (e.g thyroxine)
•   Small
•   Water soluble/Hydrophilic/Lipophobic, cannot readily pass through cell membranes
•   Relies on cell surface receptors on target cells and hence does not actually pass into the cell itself
•   Travels free in bloodstream
•   Stored in secretory vesicles and travels out of endocrine cell via exocytosis
•   Relatively short lifespan
•   Synthesised in the rER (amino acid)

I don't think these are considered protein hormones though

[DJA]

I don't think these are considered protein hormones though

What? Darest thou defy the moon?
Thou impudent rascal. From whence have you come?

Nah you're right - I bow to your supreme skill and aptitude.

By and by, I am diminished

Guru = time for shakespearean english Lauren style

[DJA]

What are the key signs of polygenic inheritance?

[sparkyblossom]

What are the key signs of polygenic inheritance?

Discontinuous variation in the trait

[psyxwar]

What? Darest thou defy the moon?
Thou impudent rascal. From whence have you come?

Nah you're right - I bow to your supreme skill and aptitude.

By and by, I am diminished

Guru = time for shakespearean english Lauren style

HAHA alright king of eng/lit

[DJA]

HAHA alright king of eng/lit

Psy check this out -> Re: Can you lose marks for writing in Shakespearean English

true queen of english

Discontinuous variation in the trait

Does that mean we can assume if we see Discontinuous variation - it must be polygenetic?

[katiesaliba]

Discontinuous variation in the trait

Polygenic inheritance gives rise to continuous variation within phenotypes, not discontinuous. Monogenic inheritance concerns discontinuous variation.

[howlingwisdom]

Discontinuous variation in the trait

Isn't polygenic inheritance when there is continuous variation  (as many genes code for a particular trait e.g height?)

Edit: beaten

[DJA]

Yep clarified thank you.

Polygenetic --> Continuous variation

[howlingwisdom]

Can hybrids still form gametes (even though they are sterile because they lack homologous chromosomes)?

[shivaji]

Can hybrids still form gametes (even though they are sterile because they lack homologous chromosomes)?

yes if they undergo something called allopoliploidy where the number of chromosomes they have double, so they effectively become polyploid. this allows homologous chromosomes to exist, and hence meiosis can proceed with the formation of gametes

[DJA]

Can hybrids still form gametes (even though they are sterile because they lack homologous chromosomes)?

Also adding to that is the fact that they might still be able to FORM gametes - but the gametes will just be non-functional as in if the egg fuses with sperm - there will be no zygote

Someone clarify this is correct^ ?

[Reus]

Discontinuous variation in the trait

Continuous*

Polygenic inheritance gives rise to continuous variation within phenotypes, not discontinuous. Monogenic inheritance concerns discontinuous variation.

How much of monogenic inheritance do we need to know?

Also another question, what is 'multiple alleles?'