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F1 generation

The first generation of offspring (first Flial generation) from a cross between two individuals homozygous for contrasting alleles. In this case the F1 must necessarily be heterozygous for the gene under investigation and the phenotypes    are   consequently    similar . The F1   generation thus shows far less variation   than   subsequent   generations (see  F2 generation ) in which segregation becomes apparent. The term F1 is also commonly,  though  incorrectly,  used  to mean the offspring produced from unspecified parents. See also F1 hybrid.
 
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