is the expression of this genetic constitution and its interaction with the environment.
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what is an allele
the different versions of the same gene
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what is a gene
a sequence of bases on the DNA molecule that codes for proteins which results in a characteristic.
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what is a dominant allele and a recessive allele
A dominant allele is always expressed in the phenotype, even when there’s only one copy of it. Dominant alleles are shown by a capital letter. Recessive alleles are those with characteristics that only appear in the phenotype if two copies are present. They’re shown by lowercase letters. Examples
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what is a codominant allele
Some alleles are both expressed in the phenotype because neither one is recessive. They are said to be codominant alleles.
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what is a locus
The allele of each gene is found at a fixed position, called a locus, on each chromosome in a pair.
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what is a diploid organism
Humans are diploid organisms. This means we have two copies of each chromosome — one from each parent. It’s why we have two alleles of each gene.
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what is the meaning of heterozygous and homozygous
The genotype can be homozygous or heterozygous at each locus in a diploid organism. If an organism carries two copies of the same allele, it’s said to be homozygous at that locus. If an organism carries two alleles for a gene, it’s heterozygous.
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diagram of a monohybrid cross
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diagram of a monohybrid inheritance for codominant alleles
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