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arsen [322]
3 years ago
8

In fruit flies, the allele for white eyes is recessive to the allele for red eyes. In a generation of fruit flies, 45 males with

white eyes, 46 females with white eyes, 44 males with red eyes, and 47 females with red eyes are produced. Which of the following is the best conclusion you can make about the parents of this generation?
Select one:
a. One parent was heterozygous for eye color and the other was homozygous with red eyes.
b. Both parents were homozygous with red eyes.
c. One parent had white eyes and the other was heterozygous for eye color.
d. Both parents were heterozygous for eye color.


While mRNA strands are being created, a sequence is sometimes miscopied. What is the worst that could happen to a cell should this take place?

a. The cell will not make functional proteins from that mRNA strand.
b. The cell will die once it tries to use that strand of mRNA.
c. The cell will have to destroy any ribosomes that use the mRNA strand.
d. The cell will pass the mRNA on to all the cells made from it.


Which of the following would most likely cause a harmful genetic mutation?

a. Insertion of three base pairs into the genetic sequence.
b. Polyploidy mutations, or inheriting an extra set of chromosomes.
c. Chromosomal mutation in germ-line cells are inherited.
d. Exposure to other mutated organisms or cells.


Can someone help me out with these??? The incorrect answers are 1-A
2- D 3-A

Biology
1 answer:
Aleksandr [31]3 years ago
7 0
1 is C - see first attachment. Genotypes with Y's represent males, and big R represents red eyes, while little r represents white eyes. For example XRxr is a heterozygous (red-eyed) female, and XrYr is a homozygous white-eyed male.

2 is B because the absence of functional proteins and some ribosomes due to the mRNA strand is not as detrimental as the loss of the entire cell.

3 is B. (The insertion of 3 base pairs into a genetic sequence is the length of a single codon, meaning that only one amino acid in the entire polypeptide was added) 

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When plants are stressed by dry conditions, they secrete the hormone abscisic acid (ABA) and in response the stomata close, even
dimaraw [331]

Answer:

C. K+ ions flow out the the guard cells and water flows out the cells.

Explanation:

The turgidity of the guard cells allows the opening and closing of the stomata. This is especially necessary when it comes to water conservation in plants. In order for the cells to become turgid or flaccid, there must be the influx and out ward movement of water via osmosis.

In order for this the occur the osmotic pressure of the cellular environment must change and this is done by changing the solute concentration.

The pumping in of K+ ions out the cell allows the solute concentration to decrease and this in turn encourages the movement of water across a concentration gradient through a semi-permiable membrane.

The water leaves the guard cells and they become flaccid. This causes the stomata to be covered.

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3 years ago
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Cream, butter, whipped cream, sour cream, and cream cheese are best described as _____. members of the milk and milk products fo
Oksanka [162]
These are best described as the members of the milk and milk products. 
Dairy products or milk products are a type of food produced from or containing the milk of mammals, especially cattle, water buffaloes, goats, sheep, camels, and humans. Dairy products include food items such as yogurt, cheese, and butter.
5 0
3 years ago
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How do seismic waves help scientists understand Earth's layers? Select the two correct answers. (1 point)
qaws [65]

Seismic waves help scientists understand Earth's layers by:

  • Scientists can observe how seismic waves change speeds when passing through different layers.
  • Scientists can observe which seismic waves cannot pass through certain layers.

<h3>What are Seismic waves?</h3>

These are waves which are generated as a result of the movement of

materials in the earth. They change speed as a result of the collision with

materials in the earth and know the types of material present as a result of

some types not being able to pass through certain medium.

Read more about Seismic waves here brainly.com/question/8553835

4 0
2 years ago
One of the grand challenges in biology is understanding how the first cells formed on Earth. Since all cells are bound by a cell
coldgirl [10]
<h2>Answer is option "A"</h2>

Explanation:

  • Oils and fats, which in science are called lipids, are known as amphipathic molecules. These molecules have two distinct ends to them: a water-loving (hydrophilic) side and a water-fearing (hydrophobic) side. While the hydrophilic sides of a lipid will associate with the water in a solution, the hydrophobic sides of the lipid all cluster together to 'hide' from the water. Lipids therefore cluster together and form spheres where the hydrophobic sides are in the center away from the water while the hydrophilic sides are on the outside, associating with the water.
  • The ability of the atoms within a group to form hydrogen bonds with the water molecules around them makes them hydrophilic. Oxygen and nitrogen atoms readily form hydrogen bonds with water molecules, so any organic molecules that have oxygen or nitrogen atoms bound to their carbon skeletons will be hydrophilic.
  • For example, if we take the molecule for cholesterol, we see the OH group on the left is hydrophilic and will form hydrogen bonds with water, while the ring structures, which only consist of hydrogen and carbon atoms, are hydrophobic and will not associate with the water.
  • There are many different kinds of lipids with different functions. Lets start by examining phospholipids, which compose the cell membranes of animals. They form lipid bilayers, with one set of hydrophilic heads facing the exterior of the cell membrane and the other set facing the interior (as you can see on the diagram on screen). The hydrophobic portions of the lipid bilayer - the lipid tails - face towards one another, which allows them to hide away from the water inside and outside of the cell.
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5 0
3 years ago
A source from which organisms generally take elements is called
Anit [1.1K]

Answer:

A source from which organisms generally take elements is called exchange pool (option B).

Explanation:

Options for this question are:

  • <em>Food web.</em>
  • <em>Exchange pool.</em>
  • <em>Reservoir.</em>
  • <em>Biotic community.</em>

The term exchange pool is related to the biogeochemical cycles that exist in nature, referring to the source from which elements present in the environment become part of living organisms.

<u>Exchange pools are the biotic components</u> -like animals and plants- of an ecosystem, which determine the passage of elements between living beings. An element can remain as a reservoir (abiotic) in the soil, and then be incorporated into the exchange pool.

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