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2545013
Genes, Chromosomes and DNA
Descrição
GCSE Science Mapa Mental sobre Genes, Chromosomes and DNA, criado por GeorgeHaines em 20-04-2015.
Sem etiquetas
science
gcse
Mapa Mental por
GeorgeHaines
, atualizado more than 1 year ago
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Criado por
GeorgeHaines
mais de 9 anos atrás
29
2
0
Resumo de Recurso
Genes, Chromosomes and DNA
Nucleus of cells contain genetic information
Genetic material is arranged into chromosomes
Humans have 23 pairs of chromosomes
Each chromosome is one long molecule of DNA coiled up
A gene is a short length of a chromosome
Genes control the development of different characteristics
e.g: Hair Colour
Genes exist in different versions
Each version is a different form of characteristic
Different versions are called alleles
e.g: Eye colour
Some characteristics are controlled only by genes
e.g: Dimples
Sometimes by several working together
Some characteristics are controlled by environmental factors
e.g: Scars
Each gene is a code for making a specific protein
Different versions of different proteins means we end up with different characteristics
Functional proteins
e.g: Enzymes
Structural proteins
e.g: Skin, hair, blood, cytoplasm
An organism's genotype depend on all the genes it has
genes - genotype
e.g: Bb
Homozygous
Two identical alleles
bb
heterozygous
Two different alleles
Bb
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