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Year 10 Revision

Exam 1

QuestionAnswer
red giant A red giant is a luminous giant star of low or intermediate mass (roughly 0.5–10 solar masses) in a late phase of stellar evolution
white dwarf the core remaining after a red giant star has exploded.
black dwarf a cooled down white dwarf that no longer emits light.
antigravity a 'force' opposite to gravity, which causes objects to push each other apart and the universe to expand.
supernova a huge explosion that happens when a red giant star has used up all its fuel.
doppler effect the effect observed when a source of waves, whether water waves, sound waves or light waves, moves towards or away from an observer.
gene a length of DNA containing instructions for making a protein.
allele different forms of a gene.
karyotype a picture created by staining, arranging and numbering chromosomes in pairs by size.
diploid when cells of a species contain pairs of chromosomes.
haploid when cells of a species have one copy of each chromosome.
co-dominance two different alleles are both expressed (shown) in the phenotype.
partial dominance a mixture of the two different alleles are expressed (shown) in the phenotype..usually meeting halfway.
chromosome a structure formed of a very long piece of DNA.
adaptation structural or behavioural characteristics of a species which help its survival in its environment.
natural selection process by which the best adapted individuals of a species survive and reproduce more successfully than those less adapted.
mutation an error in the DNA code.
variation differences between individuals of a species.
evolution change in the inherited characteristics of a group of organisms.
competition the fight between the individuals for a share of limited resources such as food, mates & shelter.
speciation the formation of a new species.
selective agent any factor in the environment which affects the survival of an organism..eg. diseases, predators.
Created by: 1081878501
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