Explain why people who inherit one mutated allele of the brca1 gene have a higher likelihood of developing cancer

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

Which of the following is likely not involved in this example of ecological succession? a) the rotting remains of plants add to the fertility of the soil. b)the soil becomes so fertile that eel grass is replaced by other plant species. c) the roots from plants stabilize the sediment, keeping it in place. d) the concentration of salt becomes so high that all plant life is destroyed.

Explain why scientists use the word dominant for certain traits.