What do the letters outside the punnet squares stand for?

What must occur during fertilization in humans in order to produce a male child

While preparing a lab, you remove a culture of prokaryotes from their incubator and place them, still alive, on the bench at 25 degrees Celsius. All die within 2 hours. The culture probably contained which prokaryotes?

Feather color in budgies is determined by two different genes, Y for pigment on the outside of the feather, and B for pigment on the inside of the feather. YYBB, YyBB, or YYBb is green; yyBB or yyBb is blue; YYbb or Yybb is yellow; and yybb is white.

Muscular dystrophy is a group of genetic diseases characterized by progressive weakness and degeneration of the skeletal muscles. a. true b. false

In labradore retreivers black coat color is dominant to brown. suppose that a black lab is mated with a brown one and the offspring are 4 black puppies and 1 brown. what can you conclude about the genotype of the black lab parent?

Which statement best describes the relationship between activation energy and rate of reaction? O Increasing the activation energy can increase the rate of a reaction. O Reducing the activation energy can increase the rate of a reaction.

Definition: this is a haploid cell with half the reproductive information from the parent.

Does a cell use energy when molecules diffuse in or out of the cell? Why?

Below is a list of possible challenges. Check all errors that you mentioned in your answer. Traits other than beak type might affect natural selection. It could take many generations to observe adaptions to a population.

A farmer dug a well but did not find any water Which reasons most likely explain why the farmer did not find water? Check all that apply.