Why do mutations associated with cancer almost always occur sequentially instead of simultaneously?

How can evolution of a population occur without changing the allele frequency of a trait within the population?

When heritability is 0%, genes play:

You are examining a human pedigree for a trait. You notice that an offspring can be affected even if neither parent is affected. This immediately tells you that the trait is:

Which of the options correctly lists the stages of human development in order?

Mendel crossed true-breeding yellow-seed plants with true-breeding green-seed plants. Given that yellow color is a dominant trait, what would the genotype of the offspring be?

In the pedigree shown, what can you say about the likely genotypes of individuals A and B?

A trait with incomplete penetrance:

A trait with incomplete penetrance:

In regions where malaria is prevalent, individuals who are _____ have a selective advantage.