Biology Marathon (1 Viewer)

[shadowlike04]

The alteration of germlines is a niche topic in the syllabus but basically, it's when a plant has two distinct haploid and diploid lifecycles/generations.
The steps involved:
1. Haploid gametophyte plant produces haploid gametes by mitosis.
2. Fertilisation results in diploid zygote.
3. Zygote grows by mitotic cell division and develops into a multicellular diploid sporophyte.
4. Sporophyte produces spores by meiosis and these spores develop by mitosis into haploid gametophytes.
Feel free to add anything I may have missed.

 

[shadowlike04]

 

[[Blank]]

Why did you re-post on a different account?
Edit: Don't worry, I'll attempt to answer soon.

 

[zizi2003_]

The alteration of germlines is a niche topic in the syllabus but basically, it's when a plant has two distinct haploid and diploid lifecycles/generations.
The steps involved:
1. Haploid gametophyte plant produces haploid gametes by mitosis.
2. Fertilisation results in diploid zygote.
3. Zygote grows by mitotic cell division and develops into a multicellular diploid sporophyte.
4. Sporophyte produces spores by meiosis and these spores develop by mitosis into haploid gametophytes.
Feel free to add anything I may have missed.

are you in year 11???
Don't remember learning this back then haha

 

[[Blank]]

are you in year 11???
Don't remember learning this back then haha

yeah, this guy's just ahead in the game.

 

[Hivaclibtibcharkwa]

View attachment 31511View attachment 31512

After dinner I’ll be answering this

 

[shadowlike04]

Nah I am in year 11 doing accelerated bio, but like I said I doubt that alteration of generations is going to be heavily assessed in the HSC. I also did in fact make a new account

 

[[Blank]]

View attachment 31511View attachment 31512

15 = A
13 = (I need help)

 

[shadowlike04]

15 = A
13 = (I need help)

Spoiler: Answer

15 is D. Once you draw a punnet square of a heterozygous cross (Pp x Pp), you are left with offspring of 1PP, 1pp, and 2Pp. From the stimulus, it states that homozygous platinum (PP) is lethal and therefore 1 offspring from the cross is automatically removed. This leaves a 2:1 ratio of platinum to silver. It is not B as there is 1pp (silver) offspring produced, it is not A as interbreeding is between different species so a silver fox can mate with a platinum fox and it is not C as you can have 2PP mate and produce a full set of offspring.

13 is B as due to the semiconservative nature of DNA replication, the two original DNA strands (the 2 complementary halves of the double helix) separate during replication. Then each strand then serves as a template for a new DNA strand. This means that one strand of the light grey side is complementary to the dark grey side.

 

[Hivaclibtibcharkwa]

View attachment 31511View attachment 31512

The standard mendellion ratio would be this


3:1
However since the AA dies out, it would be 2:1

 

[Hivaclibtibcharkwa]

View attachment 31511View attachment 31512

13 would be B

 

[Hivaclibtibcharkwa]

Spoiler: Answer

15 is D. Once you draw a punnet square of a heterozygous cross (Pp x Pp), you are left with offspring of 1PP, 1pp, and 2Pp. From the stimulus, it states that homozygous platinum (PP) is lethal and therefore 1 offspring from the cross is automatically removed. This leaves a 2:1 ratio of platinum to silver. It is not B as there is 1pp (silver) offspring produced, it is not A as interbreeding is between different species so a silver fox can mate with a platinum fox and it is not C as you can have 2PP mate and produce a full set of offspring.

13 is B as due to the semiconservative nature of DNA replication, the two original DNA strands (the 2 complementary halves of the double helix) separate during replication. Then each strand then serves as a template for a new DNA strand. This means that one strand of the light grey side is complementary to the dark grey side.

Oh yea gg boys

 

[Eagle Mum]

15 = A
13 = (I need help)

Just to dispel any confusion, option A in Q15 is, in itself, a true statement, however, it does not answer the question which asks for an observation that supports the conclusion that the platinum character is lethal in the homozygous state.

 

[[Blank]]

The standard mendellion ratio would be thisView attachment 31513


3:1
However since the AA dies out, it would be 2:1

Oh, that makes sense, (I was looking for '3:1')!

 

[Eagle Mum]

Just to dispel any confusion, option A in Q15 is, in itself, a true statement, however, it does not answer the question which asks for an observation that supports the conclusion that the platinum character is lethal in the homozygous state.

This raises an important tip - some MCQs might be a ‘trick’ by stating a true statement but one that doesn’t answer the question, so for any question similar to ‘Which of these statements support the conclusion...?’, advise looking carefully at all the options and not necessarily picking the first one that is a true statement.

 

[[Blank]]

This raises an important tip - some MCQs might be a ‘trick’ by stating a true statement but one that doesn’t answer the question, so for any question similar to ‘Which of these statements support the conclusion...?’, advise looking carefully at all the options and not necessarily picking the first one that is a true statement.

I'll definitely work on that!

 

[[Blank]]

What are the 7 ways plants perennate (Vagitively Reproduce). 3Marks

 

[hiiitsme]

What are the 7 ways plants perennate (Vagitively Reproduce). 3Marks

That question doses not make sense plus would never get asked

 

[[Blank]]

That question doses not make sense plus would never get asked

FINE, I'll answer it!
1 - Turners
2 - Runners
3 - Bulbs
4 - corms
5 - suckers
6 - fragmentation
7 - Cuttings

 

[Hamburger823]

This thread seems extremely useful, can we do one for chemistry?