Pea plants have two alleles for height: T (tall stem) and t (short stem). Two plants with genotype Tt and tt are crossed, and the 300 resulting seeds are
planted. What is the probability that any new pea plants are predicted to be
short? Use a punnet's square to find out.
1 in 2
1 in 4
1 in 16
all will be short
none will be short

Rank the three variables in terms of how strongly they affect the "species" composition of the bacterial communities. place the variable with the weakest effect on the left and the variable with the strongest effect on the right.

Which of the following statements about archaea and bacteria is true? a. neither is single-celled. b. they both have nuclear membranes. c. neither reproduces by binary fission. d. they both lack a nuclear membrane.

Which of the following best describes the expensive tissue hypothesis? brains require more energy, so the gut had to be reduced, and larger brains and tool use led to higher quality diets. increasing body size means that homo neanderthalensis had to include more fat in its diet. brains require more energy, so the gut had to be reduced as brains got bigger. brains require more fat, so the gastrointestinal viscera (gut) had to expand, and hands were needed to acquire more food.