Biology Answers

Most foods derived from genetically modified crops contain:

d. Hundreds of additional genes.

a. The same number of genes as food produced from conventional crops.

c. One or two additional genes.

b. The same number of genes as foods produced from hybrid crops.

e. No genes at all.

The process of amplification of specific DNA sequences by an enzymatic process is termed as ____________

a. Amplifica.tion

b. polymerase chain reaction (PCR)

c. translation

d. microarrays

The initial objective for developing plants based on GM organisms was to improve crop protection. The GM crops currently on the market are mainly aimed at an increased level of crop protection through the introduction of resistance against plant diseases caused by insects or viruses or through increased tolerance towards herbicides. 

False

True

Where exactly is body temperature monitored and controlled?

a. the skin

b. the brain

c. the pituitary gland

d. the thermoregulatory center

how would a cell be affected if the cell membrane did not have any membrane proteins and what functions would be affected

What characteristics of the respiratory system help produce efficient gas exchange in the lungs? (Short answer please)

How is the activity of enzymes in biological reactions similar to machines that build cars

What is ment by a balanced diet

4. In Jimsonweed, purple flower color (P) is dominant over white (p) and spiny pods (S) over smooth pods (s). These pairs of alleles are not linked. A Jimsonweed of genotype PPss is crossed with one of ppss. What is the genotype of the F1 generation? The phenotype?

5. In peas, the gene for tall plants (T) is dominant over the gene for dwarf plants (t) and round seed (R) is dominant over wrinkled seed (r). If one crosses a homozygous tall, wrinkled-seeded plant with a homozygous dwarf, round-seeded plant, what is the phenotype of the F1? The genotype of the F1? The phenotypic ratio of the F2?

6. If the cross BbDD X bbDd is made, which of the following would not be represented in the offspring?

a. BbDD; b. BbDd; c. bbDD; d. bbDd; e. BBDd

Four o'clocks exhibit incomplete dominance. Thus, if a plant with red flowers is crossed with a plant with white flowers, the offspring will all produce pink flowers. What offspring would you expect if you crossed a red-flowered plant with a pink-flowered plant?

II. DIHYBRID CROSSES

3. How many different kinds of gametes can an organism of genotype RrSS produce? List them.

1. Most individuals of a certain wild flower have white petals, but a few are blue. Crosses have shown that the blue color is due to a recessive allele. Use "W" for white and "w" for blue.

a. What is the genotype of a blue-flowered plant and what gametes would it produce as a result of meiosis?

b. What is/are the genotype(s) of each of a blue-flowered plant's parents?

c. If a blue-flowered plant has two white-flowered parents, and the parents produced many offspring, what fraction of them would you expect to be blue?

d. If a blue-flowered plant is crossed with its white-flowered parent, what fraction of their offspring would have the genotype "ww"?

e. If two blue-flowered plants cross, what fraction of their offspring will be blue? White?

Hi, I have two questions. I know that temperature increase will increase membrane permeability and cause it to be more fluid, but how does this connect to something in society?

Also, I know soap also increases membrane permeability but how does this connect to something in real life/ society/health?

Describe the physiological relationship between the hypothalamus and the pituitary gland. Include the separate roles, hormones, and anatomical connection