In poultry, a crested head is produced by a dominant allele C and a plain head by its recessive allele c. If a plain-headed bird is crossed with a heterozygous crested-headed bird then the genotype and phenotype of the F1 individuals could be:
A. cc: crested-headed
B. CC: crested-headed
C. Cc: plain-headed
D. cc: plain-headed
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