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What is a gene?
A specific sequence of DNA that codes for a functional product — usually a protein
What is an allele?
Alternative forms of a gene found at the same locus on homologous chromosomes
What is a homozygous organism?
An organism with two identical alleles for a trait. e.g. TT or tt
What is a heterozygous organism?
An organism with two different alleles for a trait. e.g. Tt
What is Mendel's dihybrid cross?
A cross involving two pairs of contrasting characters simultaneously
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