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4 years ago

Data samples in which you expect no change to occur are_____.

1 answer:

5 0

The answer is negative controls. These are groups where no phenomenon is probable. They ensure that there is no effect when there should be no effect. Where there are only two possible outcomes, e.g. positive or negative, if the treatment group and the negative control both produce a negative result, it can be concluded that the treatment had no effect. If the negative control group and the treatment group both yield a positive result, it can be inferred that a puzzling variable is involved in the occurrence under study, and the positive results are not only due to the treatment. In other examples, outcomes might be measured as lengths, times, percentages, and so forth.

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What is brine rejection?

saveliy_v [14]

Brine rejection is a process that occurs when salty water freezes. The salts do not fit in the crystal structure of water ice, so the salt is expelled.

6 0

4 years ago

Read 2 more answers

The cladogram shown below describes the evolutionary relationship among several species, labeled A to F. The five dots represent

max2010maxim [7]

(You will find the cladogram in the attaches files)

Answer:

C. The genomes of species C and D are nearly identical because neither species has a derived character.

Explanation:

A Cladogram is a tree-type graph based on cladistic analysis. It represents the common ancestral relationships among the involved groups.

The tree-type graph is a ramified diagram that represents the relationship between the involved taxa.
The cladistic analysis follows the maximum parsimony criterium. Explains the character state from the point of view of the fewest changes through history. Explains evolution with the minimal amount of evolutive changes. It recognizes the monophyletic groups as natural groups. These groups are the clades, and their classification -sequencing- represents their phylogeny.

The sequencing term refers to lists of groups according to their relation. One group is the brother-group of the following one.

So the cladogram represents the relationship between groups according to a derived character.

The derivated character is any trait that a group passes to the descendants. Through evolution, the characters change, and new changes are added. When referring to a derivate character, we mean that all the subsequent species in the cladogram carry the trait.

A cladogram provides an image of how new species keep characters that were inherited from older species.

So, in the exposed example, the five dots represent derived characters, representing traits 1 to 5. Branches A to F, represent groups. (See the cladogram in the attached files). Group A inherited trait 1, group B probably still carries trait 1, but also trait 2. Groups C and D equally inherited trait 3. Group E inherited character 4, and finally, group F inherited character 5.

Groups C and D inherited trait 3 and probably also still have traits 1 and 2. So they are very similar to each other. At a certain point, they diverged, probably due to a new mutation that was not passed to the rest of the group.

C. The genomes of species C and D are nearly identical because neither species has a derived character. Correct.

6 0

3 years ago

A U.S. law that protects

Ivanshal [37]

TRUE! you didn't know that?

4 0

3 years ago

Read 2 more answers

Consider this animal cell.

V125BC [204]

Answer:

1: cell membrane

2. chloroplast

Explanation:

1. the cell membrane is the outer layer of an animal cell since they don't have cell walls

2. only plant cells have chloroplasts

4 0

3 years ago

a human skin cell contains 46 chromosomes. A frog sprem cell conrains 12 chromosomes. which paie of number of a normal gamete fr

schepotkina [342]

Human 23, frog 12
Because gametes contain half the number of usual chromosomes, so a human gamete would have 46/2 or 23 chromosomes. A frog sperm cell is a gamete so it would have 12 chromosomes anyway.

Hope this helps :)

8 0

3 years ago