Variation and Inheritance

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Phenotype

Genotype

Allele

Homozygous

Heterozygous

P

F1

F2

Recessive

Dominant

Gene

Chromosome

DNA

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Parent

It is a threadlike structure which contains DNA.

The different forms of a gene.

The complete set of genes which control inherited characteristics.

Is made of DNA, is part of a chromosome and holds genetic information about a characteristic.

Is a molecule that carries genetic instructions.

1st generation

When both alleles are the same.

2nd generation

Masks the recessive phenotype so its phenotype will always show up if it is present. Represented by a capital case letter.

Phenotype is masked by the dominant phenotype so does not show up. Represented by a lower case letter.

The physical characteristics possessed by an organism such as coat colour.

When both alleles are different.


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