Biology question (2 Viewers)

[[Blank]]

I'll solve it now, also, check your DMs.

 

[[Blank]]

Ok, I found the answer.
the one with the circles is the representation of gene conservation, while the other one is the modern idea of crossing over.

Edit: Never mind, I'm getting there, but that isn't it.

 

[zizi2003_]

View attachment 31005

Basically,
The model that we have now recognises that DNA replication (interphase) occurs before crossing over (prophase I), as a result of there are two homologous pairs of chromosomes
Also, it is now known that crossing over occurs between the two chromatids in the tetrad. This means that there are parental chromosomes (see the ones that are completely black/white, with no recombinant DNA?) that do not undergo the process of crossing over.
The effect of this is that not all gametes produced will contain chromatids that have undergone crossing over

 

[[Blank]]

Ok, how about this answer:
The chromosomes exchange information through 'crossing over', however, the diagram shows that it was performed from the chromatid, and SOMEHOW exchanged the specifically needed alleles to express the phenotype. This means, when comparing their diagram to our current one, ours is more in-depth in regards to the exact assessment of how crossing over occurs on any part of the chromosome that is genotypically mirrored to the 2nd chromosome of the same type.

 

[[Blank]]

Basically,
The model that we have now recognises that DNA replication (interphase) occurs before crossing over (prophase I), as a result of there are two homologous pairs of chromosomes
Also, it is now known that crossing over occurs between the two chromatids in the tetrad. This means that there are parental chromosomes (see the ones that are completely black/white, with no recombinant DNA?) that do not undergo the process of crossing over.View attachment 31452
The effect of this is that not all gametes produced will contain chromatids that have undergone crossing over

MY GOSH! I WAS SO CLOSE! I was talking about that a bit at the end of my reply!

 

[zizi2003_]

Ok, how about this answer:
The chromosomes exchange information through 'crossing over', however, the diagram shows that it was performed from the chromatid, and SOMEHOW exchanged the specifically needed alleles to express the phenotype. This means, when comparing their diagram to our current one, ours is more in-depth in regards to the exact assessment of how crossing over occurs on any part of the chromosome that is genotypically mirrored to the 2nd chromosome of the same type.

wait what do you mean by 'genotypically mirrored to the 2nd chromosome of the same type'?
Do you mean 'homologous chromosomes' - this term would be better to use as they are chromosomes of the same size and with the same loci, but differing alleles

 

[[Blank]]

wait what do you mean by 'genotypically mirrored to the 2nd chromosome of the same type'?
Do you mean 'homologous chromosomes' - this term would be better to use as they are chromosomes of the same size and with the same loci, but differing alleles

Yeah, you're right - my mind went blank when thinking about the differences between the two parents, but regardless, they are both the same chromosome type.