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2330619
GCSE AQA Biology 1 Variation, Genetics & Reproduction
Descripción
Mind map showing information about variation caused by genetic and environmental factors, genetics and sexual and asexual reproduction
Sin etiquetas
gcse
aqa
biology unit 1
variation
genetics
reproduction
biology
biology 1
gcse
Mapa Mental por
Lilac Potato
, actualizado hace más de 1 año
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Creado por
Lilac Potato
hace más de 9 años
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Resumen del Recurso
GCSE AQA Biology 1 Variation, Genetics & Reproduction
Variation
Genetic
Characteristics similar to parents'
Genes inherited from parents
Some genes from mother, some from father
No 2 members of species identical (apart from identical twins)
Environmental
Differences that have been caused by conditions organism lives in
Characteristics affected by genetic & environmental factors...
Genes, chromosomes and DNA
Cells have nucleus - contains genetic info in form of chromosomes
Human cell nucleus contains 23 pairs of chromosomes
Chromosomes carry genes - genes control development of different characteristics
Gene is short length of chromosome, which is long length of DNA - can be diffferent versions of same gene (alleles)
DNA coiled up to form arms of chromosome
Sexual reproduction
Fusion of male & female gametes - 2 parents so offspring contain mixture of parents' genes
Each gamete contains 23 chromosomes
When fertilised, form cell with full number of chromosomes
Offspring inherits features from both parents - produces variation
Asexual reproduction
Only 1 parent
No fusion of gametes
No mixing of chromosomes/no genetic variation
Offspring are genetically identical (clones)
How plant & animals grow/produce replacement cells
Some organisms produce offspring using asexual reproduction (bacteria & certain plants)
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