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Biology
A Level

What are the four stages of mitosis and what characteristic events occur within the cell at each stage?

Mitosis is the division of one cells contents to either side of the cell in preparation for cytokinesis which is the splitting of one cell into two identical, diploid, daughter cells. The four stages of m...

Answered by Olivia G. Biology tutor
4600 Views

Describe how acetylcoenzyme A is formed in the link reaction.

The link reaction occurs in the mitochondrial matrix. In the first step, carbon dioxide and hydrogen are removed from two pyruvate molecules, producing two acetyl groups. The hydrogen removed is transferr...

Answered by Alessandra P. Biology tutor
16752 Views

Describe and explain how a tiger with striped fur may have evolved from a non-striped ancestor

Natural selection: Mutations (e.g. of pigment gene, and of regulatory genes) creating variability between members of the same species. Selection pressure of prey availability - Selection pressures are ext...

Answered by Ruchi D. Biology tutor
10001 Views

what is co-dominance?

Co-dominance is when two alleles are expressed equally in the phenotype in the heterozygote. For example, plants that are homozygous for one allele may be red and plants that are homozygous for another al...

Answered by Pranathi Y. Biology tutor
2732 Views

What are the characteristic properties of the genetic code?

Non-overlapping: The genetic code is read in triplets of bases, called codons, each of which codes for an amino acid.Degenerate: Each amino acid can be coded for by more ...

Answered by Calum H. Biology tutor
2495 Views

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