BIOLOGY HIGH SCHOOL

What is mendel's law of independent assortment?

Answers

Answer 1
Answer: The principal originated by Gregor Mendel, stating that when two or more characteristics are inherited, individual hereditary factors assort independently during gamete production, giving different traits an equal opportunity of occurring together.

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When homologous chromosomes crossover, what occurs? A) Two chromatids get tangled, resulting in one re-sequencing its DNA.
B) Two sister chromatids exchange identical pieces of DNA.
C) Specific proteins break the two strands and re-join them with their homologs.
D) Each of the four DNA strands of a tetrad is broken and the pieces are mixed.
E) Maternal alleles are "corrected" to be like paternal alleles and vice versa.

Answers

B) Two sister chromatids exchange identical pieces of DNA. 

The homologous chromosomes have the same genes in common. Each cell has at least two sets of chromosomes which one comes from one’s father also called as paternal chromosome and mother, called as the maternal chromosomes. These chromosomes are what makes the child obtain the characters and may depend on the traits the parents possess. Homologous chromosomes are not duplicated chromosomes or identical however, they are analogous or similar. 

Final answer:

Homologous chromosomes crossover during meiosis when specific proteins break two DNA strands at corresponding points and re-join them with their homologs, resulting in an exchange of genetic material.

Explanation:

When homologous chromosomes participate in a process called crossover during meiosis, option C) takes place. Specific proteins cause the two DNA strands to break at corresponding points. These proteins then re-join them with their homologs, switching certain sections of DNA between the two chromosomes. This process is a fundamental feature of sexual reproduction and contributes to genetic diversity because the chromatids that undergo exchange, although from homologous chromosomes, are not identical.

Learn more about Homologous Chromosomes here:

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Which of the following would be an example human/environment interaction?a. damming a river to prevent flooding.
b. Wind Erosion.
c. Glacial deposits.
d. a river flowing into a delta

Answers

A. Damming a river to prevent flooding. The other three choices are apart of nature and require no human input

What radiation is used in hospitals and how does it cause a problem for staff/workers?

Answers

Radiation is used for X-rays, MRIS, any type of cancer killing. 
Too much of radiation can be a dangerous thing... you could end up dying from a lot of exposure. 
The radiation used is gamma radiation. It causes a problem for staff/workers as it's highly penetrating meaning it can penetrate (go through) almost anything . The staff/workers will have a lot of exposure to this gamma radiation and too much exposure allows the radiation to kill cells, even the useful ones.

Process that takes place at mid-ocean ridgesA. Sea-floor spreading

B. Continental drift

C. Magnetic reversal

D. Magnetic minerals

E. Fossils

Answers

Answer;

-Sea-floor spreading

Sea floor spreading is process that takes place at mid-ocean ridges, evidence is found in magnetic minerals on the ocean floor.

Explanation;

-Seafloor spreading is a geologic process in which tectonic plates; large slabs of Earth's lithosphere; split apart from each other.

-Seafloor spreading and other tectonic activity processes are the result of mantle convection. Mantle convection is the slow, churning motion of Earth’s mantle. Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle’s convection currents makes the crust more plastic and less dense.
a. sea-floor spreading

What are the three types of fingerprints found in the human population? How often does each occur? Please help!

Answers

What is Fingerprint ?

  • The mark made by the skin of a finger, used for identifying people
  • A fingerprint is an impression left by the friction ridges of a human finger. The recovery of partial fingerprints from a crime scene is an important method of forensic science. Moisture and grease on a finger result in fingerprints on surfaces such as glass or metal.
  • It is mainly study in forensics science as branch of fingerprint science

What are the types?

  • Fingerprint mainly divided into 3 categories

1. ARCH

2. LOOP

3. WHORL

How often does each occur?

  • It occurs due to finger ridges found on the outer layer of skin.
  • Various oils and different types of liquid or sweat produced by the sebaceous layer of skin.

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The three fingerprint classes are arches, loops, and whorls. Arches occur about 5% of the time, loops occur about 60-65% of the time, Whorls occur about 30-35% of the time.

Which of the following decreases the reliability of results from a clinical trial?A. An obsolete medical treatment
B. A double-blind technique
C. A short observation period
D. A voluntary enrollment plan

Answers

The best answer to the question states above is letter C. A short observation period.

 A scientist's primary concern in a clinical trial is the patient's safety, there fore short observation decreases the reliability of results from a clinical trial

Answer:

C. A short observation period

Explanation:

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