Stabilising selection Study guides, Revision notes & Summaries

AQA A LEVEL BIOLOGY QUESTIONS AND ANSWERS 100% PASS the krebs cycle takes place in the _______ of the ___________ matrix mitochondria epistasis arises when the allele of one gene affects or masks the expression of another in the phenotype autosome a chromosome that is not a sex chromosome biodiversity the range and variety of genes, species and habitats within a particular region biomass the total mass of living material, normally measured in a specific area over a given period of time intr...

NCEA Level 3 – Speciation Questions and Answers 2023 Adaptive Radiation When a large number of species diverge from a common ancestor, each occupies a different niche. Divergent Evolution The process by which a species evolves into two or more descendants species. Allopatric Speciation Speciation occurs in different geographic areas. Sympatric Speciation Speciation occurs in the same geographic area. Speciation The formation of a new species that are able to i...

AQA A level Biology topic 7 Latest 2023 Graded A+ What is a dominant allele? Allele which is always expressed in the phenotype even when theres only one copy of it What are recessive alleles? Alleges that only appear in the phenotype if 2 copies are present What are codominant alleles? Alleles that are both expressed in the phenotype because neither one is recessive If an organism carries two copies of the same allele it said to be ........ Homozygous at the locus If an organism carries two ...

AQA A LEVEL BIOLOGY 2023(Exam Elaboration) What is the function of the cell membrane? - CORRECT ANSWER-To control what enters and leaves the cell, acts as a barrier between the cell and its environment. What structural feature of the cell membrane allows substances to enter/leave? - CORRECT ANSWER-Partially permeable What is the fluid mosaic model? - CORRECT ANSWER-States that a membrane is a fluid structure (because phospholipids are constantly moving) with a "mosaic" of various p...

AQA A LEVEL BIOLOGY ALL ANSWERS CORRECT the krebs cycle takes place in the _______ of the ___________ epistasis matrix mitochondria arises when the allele of one gene affects or masks the expression of another in the phenotype autosome biodiversity biomass of time a chromosome that is not a sex chromosome the range and variety of genes, species and habitats within a particular region the total mass of living material, normally measured in a specific area over a ...

the krebs cycle takes place in the _______ of the ___________ - correct answer matrix mitochondria epistasis - correct answer arises when the allele of one gene affects or masks the expression of another in the phenotype autosome - correct answer a chromosome that is not a sex chromosome biodiversity - correct answer ...

Capsule (slime) - ANSWER Protects the bacteria from attack by cells of the immune system. Flagellum - ANSWER Rotates to make the cell move. Viruses - ANSWER Acellular. Invade and reproduce inside the cells of other organisms. What is magnification? - ANSWER How much bigger the image is that the specimen. What is resolution? - ANSWER The ability of the microscope to distinguish between two points that are close together. Light/optical microscopes - ANSWER Uses light. Max resolut...

AQA A LEVEL BIOLOGY Paper 1 2024 What is the function of the cell membrane? - ANS To control what enters and leaves the cell, acts as a barrier between the cell and its environment. What structural feature of the cell membrane allows substances to enter/leave? - ANS Partially permeable What is the fluid mosaic model? - ANS States that a membrane is a fluid structure (because phospholipids are constantly moving) with a "mosaic" of various proteins embedded in it Describe t...

what is simple diffusion molecules pass directly through the plasma membrane without the assistance of another molecule, from a higher concentration to a lower concentration. when is simple diffusion used to allow molecules to travel in and out of the cell membrane: examples water, o2, co2 and ethanol. What is a phospholipid? It is a lipid that has a phosphate group attached to the glycerol and only two fatty acid chains. What is a protein? chain of amino acids ...

Microeconomics Free Goods A market - ANSWER: An arrangement by which buyers and sellers negotiate the exchange of goods and services A model - ANSWER: A simplified representation of reality used to create hypotheses about economic decisions and events Abnormal profit - ANSWER: The level of profit made over and above normal profit. Can only be made in the long run by firms with monopoly power Adverse selection - ANSWER: A situation in which those who are at higher risk/more likely to nee...