BIOLOGY COLLEGE

Which of the following contribute(s) to the variation in offspring produced by sexual reproduction? A. Crossing over
B. Mutation
C. Independent assortment
D. Random fertilization
E. All of the above

Answers

Answer 1
Answer:

Answer:

The correct answer is E. All of the above

Explanation:

Variation in offspring can be contributed by many different events that change the DNA sequence in gametic cells. These events are crossing over, mutation, independent assortment, and random fertilization.

During the gamete formation, the different genes are assorted independently from the other gametes which results in forming various possible combinations of genes in a gamete increasing the genetic variation.

Crossing over occurs during meiosis between the homologous chromosome that results in exchange of genetic material that brings genetic variation in gametes. During random fertilization, the two gametes fuse and genetic material of two different individual comes to make an offspring which forms a genetical different offspring.

Mutation in the gametic cell is transferred to the offspring during fertilization. Therefore all contributes to variation in offspring produced by sexual reproduction.

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Please help thanks for the answers

How do plant cells that do not have chlorophyll get food?​

Answers

Answer:

All plants cells have chlorophyll so there is no problem

In general, which factor is NOT critical when beginning an exercise program?A. using appropriate protective equipment during exercise
B. finding friends who like to exercise the same way you do
C. seeing your doctor for a physical assessment prior to beginning exercise
D. choosing clothing that is designed to match your exercise program
Please select the best answer from the choices provided.
Ο Α
B
OD

Answers

Answer:

The non-critical factor when a person begin an exercise program is finding friends who like to exercise the same way you do.

Explanation:

Physical exercise is an ideal way to stay healthy. It is a personal activity that should be done in the best way and with a minimum risk. Finding friends who like to exercise can contribute to motivation, but it is not an indispensable element when establishing a personal exercise routine.

Since it is a personal activity that affects an individual's health, personal factors should be considered when establishing a exercise program.

Regarding the other options, which are important factors for the exercise :

  • Use appropriate protective equipment during exercise, allows to avoid injuries during physical activity.
  • See the doctor for a physical assessment prior to beginning exercise, establishing the state of health and physical condition appropriate for this activity.
  • Choose clothing that is designed to match your exercise program,  which must be comfortable and light, allowing maximum performance to be achieved.

HELPPP!!! Which energy source causes the most pollution? biomass oil uranium coal

Answers

coal produces the most pollution.

Human actions can cause significant changes to the plant’s surface. Humans have cleared large areas of forests and other vegetation. If the area experiences heavy rain, which of the following is most likely to increase?A. Erosion
B. Earthquakes
C. Volcanic activity
D. Chemical weathering

Answers

Answer:

Chemical weathering?

Explanation:

I have this question to I got stuck on it but I have a feeling it’s chemical weathering

Which method(s) can be used to join double-stranded breaks in DNA? (choose all that apply)a. homologous end joining
b. polymerase chain reaction
c. homologous recombination
d. Non-homologous end joining

Answers

Answer:

Option (a) and (d).

Explanation:

The breaks in DNA molecule may occur due to replication error and oxidizing agent. The double-stranded breaks in DNA can be corrected by Homologous end joining and non homologous end joining.

Homologous end joining is used to repair the DNA present in G2 nad S phases of the cell cycle. The homologous sequences of DNA is used to repair the DNA. Non homologous end joining occurs in the cell present at G0 and G1 phase of the cell cycle. The DNA broken ends are juxtaposed and later rejoin together by DNA ligase.

Thus, the correct answer is option (a) and (d).

You transform an E. coli bacterium with the pGLO plasmid. After growing the +pGLO bacteria on an LB+Ampicillin+Arabinose plate, you see distinct colonies form after 16 hours. You check these colonies under the UV light and see that they are glowing a bright fluorescent green color. If you use a sterile loop and inoculate a new plate with LB+Ampicillin+Arabinose (coated on them, as usual) with these transformed E. coli will you see any growth? If there is growth, will it glow?

Answers

Options for the question have not been provided. The complete question has been attached.

Answer:

A. Yes, we will see growth. Yes, they will glow.

Explanation:

pGLO plasmid was engineered to be used as a vector in the field of biotechnology. It has an ampicillin resistance gene which acts as a reporter gene. It also has another reporter gene, GFP which shares its promoter (araC) with the gene responsible for metabolizing arabinose. GFP gene is thus translated only in the presence of arabinose in the medium since the promoter is active only in the presence of arabinose. Once the GFP gene is translated, the colonies glow with green fluorescence under UV light.

Here, the E.Coli colonies were grown successfully on LB + Ampicillin + Arabinose plate so they were ampicillin resistant. They also glowed in UV light. If these transformed colonies are inoculated in another LB + Ampicillin + Arabinose plate they will be able to grow successfully since they are ampicillin resistant. They will also glow because the new plate also has arabinose so the araC promoter will be active and expression of both GFP gene and arabinose metabolizing gene will occur.

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