VCE Biology Question Thread

[melons]

Do we need to remember how old the geological periods are? (Carboniferous, Triassic etc.)

I don't think so... Our teacher didn't say we had to anyway.

[Sense]

Both parents are heterozygous as they have a child with the condition, but don't express the trait themselves. By doing a punnet square we know that they have a 1/4 of homozygous dominant, 1/4 of homozygous recessive and 1/2 of heterozygous offspring. We know that III-3 is not homozygous recessive as they do not express the trait. Hence, there are two possible outcomes: she is homozygous dominant (1/3) or heterozygous (2/3) as the Punnett square has only three squares which are 'viable'. So the probability that she is Pp is 2/3 and the answer is C.

Thanks

[millie96]

What causes differences in amino acid sequences between species? for 2 marks

Mutations? how do we explain this for 2 marks

[Sense]

What causes differences in amino acid sequences between species? for 2 marks

Mutations? how do we explain this for 2 marks

Differences in amino acid sequences can be caused by mutations such as errors in the DNA when it was being copied in meiosis, radiation and other harmful chemicals.

[dankfrank420]

What causes differences in amino acid sequences between species? for 2 marks

Mutations? how do we explain this for 2 marks

Seeing as its a 2 mark question, it might be asking you to reference the two types of mutation: spontaneous (random mutations, errors in meiosis) or induced (chemicals, UV rays etc.)

[Scooby]

What causes differences in amino acid sequences between species? for 2 marks

Mutations? how do we explain this for 2 marks

You should mention as well that these mutations will have begun to occur after the evolutionary lines leading to them diverged

[vox nihili]

You need to mention how mutation changes it though. What does mutation do that leads to a change in primary structure (AA sequence)?

[popoy111]

How does gene therapies issue of decreasing natural selection in future generations affect evolution?

[Fingerscrossed]

How would we answer this question for a SAC on the impact of Human Intervention on Evolution? It's a report so I think they expect a detailed answer...

What is the potential evolutionary impact of genetic modification of food crops? (In particular, Canola!)

Thanks 

[RazzMeTazz]

What is the difference between the cytoplasm and the protoplasm?

[Reus]

What is the difference between the cytoplasm and the protoplasm?

You could surely find that on google... 

[Stressedyear11here]

How does genetic drift, selection pressure, and gene flow affect (effect?)/influence natural selection? I've read that it is a changing agent. but I'm not sure how.

Thank you!!

[melons]

How does genetic drift, selection pressure, and gene flow affect (effect?)/influence natural selection? I've read that it is a changing agent. but I'm not sure how.

Thank you!!

Genetic drift and gene flow change the allele frequencies in a population. They can also introduce a new allele or result in a loss of an existing one. Variation is needed for natural selection to take place.
Selection pressures decide which individuals survive (depending on their phenotype). Those with the favourable characteristic survives to reproduce and pass on their genes to the next generation, increasing the proportion of individuals with that phenotype. This is essentially natural selection.

[nerdmmb]

Sorry to go off topic, but our teacher said that we'll be finishing unit 4 during mid-September and I haven't really started on evolution yet myself. Is that something to worry about?

[dankfrank420]

Why is AoS 2 of Unit 4 so boring?