Answer:

allele

Answer	Crossword Clue
ALLELE	One of a gene pair
ALLELE	Mutated gene
ALLELE	Form of a gene

ALLELE	Gene form that determines flower color
ALLELE	Gene variant
ALLELE	Gene's alternate form
ALLELE	Alternative gene form
ALLELE	Alternative form of a gene
ALLELE	Certain gene
ALLELE	Cause of hereditary variation
ALLELE	Mendelian gene

ALLELE	One of a pair of genes
ALLELE	Genetic form
ALLELE	One may be dominant
ALLELE	Gene arising through mutation
ALLELE	Genetic variant
ALLELE	Half of a genetic duo
ALLELE	Genotype determinant
ALLELE	Alternate form of a gene

ALLELE	Variant of a gene