One of the traits Gregor Mendel studied was flower color in pea plants. Mendel found that purple color factor was dominant to white color factor. Now, we know that Mendel’s factors are genes, or alleles.

An illustration of two generations of plants labeled the F1 and F2 with all purple flowers in the F1 and ¾ purple and ¼ white in the F2 generation.

Look at the F1 generation produced when two parent plants are crossed. Then, look at the F2 generation produced when two F1 plants are crossed. What can you infer about the original parents’ genotype and phenotype? Choose the 2 statements that apply.

In natural selection, what is actually “selected? ” a) alleles are directly selected b) genotypes are directly selected c) phenotypes are directly selected d) entire populations are directly selected

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

Rease is an enzyme used by plants to break down urea (a nitrogen-containing compound) into carbon dioxide and ammonia. urease urea > > > carbon dioxide and ammonia ammonia is broken down by plants into a nitrogen source plants need to grow. thus, plants could not use urea as a nitrogen source unless it was first converted to ammonia. in soybean plants there are two different kinds of urease, one produced in the seeds and the other produced in the leaves of the plant. three types of soybean plants were used in a set of experiments: normal soybeans and two mutant strains, one lacking the urease in the seeds only (strain 1) and one lacking urease in the leaves only (strain 2). experiment 1 separate areas in a field were planted with normal, strain 1, and strain 2 soybeans. all types of soybeans appeared to grow, flower, and produce seeds equally well. there were no externally detectable differences among the strains. experiment 2 small pieces of plant leaves of equal weight were obtained from each type of soybean plant and separately placed on media in culture dishes. tissue growing in this way will become an unorganized clump of cells referred to as callus. to provide a controlled nitrogen source, half the tissue samples of each type were placed on media containing urea, and the other half of the samples were placed on media containing ammonia. after 30 days, the weight gain for each of the callus samples was determined. results are shown in the table below.