In four o’clock plants, there are three phenotypes for flower color, but only two alleles. The table shows both the expected and observed numbers of plants of each flower color in a population of 1,000. The graph shows this:

Phenotypes Number Expected Number observed

Red Flowers: 105 173

Pink flowers: 484 343

White flowers: 411 484

Which statement best explains the results in the table?

1. The population is in equilibrium because the total number of plants expected and observed was about the same.

2. The population evolved because the frequency of the alleles and the genotypes changed.

3. The frequency of the alleles and genotypes in the population changed because of gene flow.

4. The observed frequency of the phenotypes is different from the expected frequency because some alleles mutated.

That you

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.

Define the apical impulse and describe its normal location, size, and duration. which abnormal conditions may affect the location of the apical impulse? explain the mechanism producing normal first and second heart sounds. describe the effect of respiration on the heart sounds. describe the characteristics of the first heart sound and its intensity at the apex of the heart and at the base. describe the characteristics of the second heart sound and its intensity at the apex of the heart and at the base.

Qué sucede cuando una persona tiene muy poco o demasiado costeroides?