Shell color in crabs is determined by a polygenic inheritance system, possibly involving involving as many as 9 genes. For simplicity let’s consider the influence of 3 genes: A, B and C, where a dominant allele darkens shell color .

Crab A: BaABC

Crab D: Baaa

Crab B: BaCaaa

Crab C:

The trp operon in e. coli regulates genes that code for enzymes required for synthesis of the repressible operon. when tryptophan is not available amino acid tryptophan. the trp operon is a in the environment, the trp repressor protein activeinactiveregulated. therefore, rna polymerase can bind to the genes to begin transcription.

Rue or false siblings look simila rbecause they each have some traits of their parents.

Are gametes exactly the same? explain why or why not?