Lee Ann has two fish. One is heterozygous for orange color, and the other is homozygous recessive for black color. Lee Ann decides she wants to breed her fish, but she wants to know ahead of time how many fish of each color will hatch.
O -> orange; o -> black

What is the genotypic ratio of the fish?
offspring genotype: %

offspring genotype: %

What is the phenotypic ratio of the fish?
offspring phenotype: %

offspring phenotype: %

Female luna moths (actias luna) attract males by emitting chemical signals that spread through the air. a male hundreds of meters away can detect these molecules and fly toward their source. the sensory organs responsible for this behavior are the comblike antennae visible in the photograph shown here. each filament of an antenna is equipped with thousands of receptor cells that detect the sex attractant. based on what you learned in this chapter, propose a hypothesis to account for the ability of the male moth to detect a specific molecule in the presence of many other molecules in the air. what predictions does your hypothesis make? design an experiment to test one of these predictions.