Variation

Sariuo
Flashcards by Sariuo, updated more than 1 year ago
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B1 - Topic 1
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Question Answer
What are the 5 kingdoms? Animalia, Plantae, Fungi, Protoctista, Prokaryotes
The 5 classes of Vertebrates? Fish, Mammals, Reptiles, Birds and Amphibians
Order of the hierarchical for classification? Kingdom, Phylum, Class, Order, Family, Genus, Species
Two causes of variation? Genes, Environment
Continuous variation is? vary within range, no distinct categories
Discontinuous variation is? There are distinct categories e.g blood group (A, B, AB, O)
-Adaption to high temps Chemosynthesis is? Bacteria that has adapted to live on Hydrothermal vents, making their own food using chemical energy.
-Adaption to cold temps Name an animals that has adapted to live in polar regions? Polar bears - thick hair, compact body shape, big feet (spreading weight).
Define Natural Selection? when organisms better adapted to their environment and produce offspring.
Define Specification? Specification the the development of a new species
Define Specification though isolation? A Population of a species is separated, this could be due to a physical barrier
Define Specification though Conditions? On either side of the physical barrier that has split the population the climate it different, causing the specie to have different characteristics
How many pairs of chromosomes does a human cell contain? 23 pairs
what is an allele? Different versions of the same gene
Define Homozygous? An organism with two of the same alleles. e.g HH, not Hh
Define Heterozygous? An organism with two different alleles. e.g Hh, not HH
Define a recessive characteristic? an organism with two recessive alleles e.g hh
Define a dominant characteristic? The dominant allele overrules the recessive one, e.g Hh or Hh
Define Genotype? What alleles you have
Define Phenotype? the acctual characteristic
Cystic fibrosis and sickle cell anaemia are caused by? A recessive allele
Symptoms of Cystic Fibrosis? Breathing difficulties, lung infection, malnutrition, fertility problems
Symptoms of Sickle cell Anaemia? Tiredness, painful joints, fever, anaemia
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