Question

what is the phenotype of the box labeled x?
t=tall, t=short
b=black, b=white
cross: ttbb × ttbb
options:
short white
short black

tall white
tall black

Explanation:

1. First, identify the genotype for box X: it is formed by combining the row allele Tb and column allele Tb, so the genotype is TTbb.
2. Use the given trait rules: T (dominant) = Tall, b (recessive, homozygous) = white.
3. Match the genotype to the corresponding phenotype: TT gives the tall phenotype, bb gives the white phenotype.

Answer:

tall white