Specific part of a chromosome responsible for outward appearance. It's a small section of DNA
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Locus
Position of a gene in a chromosome
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Allele
A segment of the chromosome- alternative form of a gene
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Dominant
Eg. If someone is heterozygous with a dominant allele for genes that gene will show in the phenotype. The allele is expressed if only one allele needed
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Recessive
2 recessive alleles needed for phenotype to show
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Co-dominant
Eg. White and red produce pink. Both alleles show as it is an intermediate form
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Phenotype
The outward expression of a genotype
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Genotype
The combination of alleles resulting in a phenotype
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Homozygous
2 of the same allele eg. bb
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Heterozygous 2 different allelels
Eg. Bb
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F1
First generation
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F2
2nd generation
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Autozomes
22/23 chromosomes which are not related to sex determination
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