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melamori03 [73]
3 years ago
11

Phenotypically, what two general categories of offspring did sturtevant and morgan observe in the f2 generation of their fly cro

sses?
Biology
1 answer:
Triss [41]3 years ago
6 0

Answer;

-Red eyes/ white eyes

Explanation;

-Morgan discovered a single male fly with white eyes. He mated this mutant white-eyed male with a red-eyed (wild-type) female. The F1 generation all had red eyes (wild-type is dominant).

-The F2 generation showed the 3:1 red:white eye ratio, but only males (1/2) had white eyes. Morgan deduced that the white eye mutant allele must be located on the X chromosome.

-Alfred H. Sturtevant, Morgan's student assumed that if crossing over occurs randomly,the probability of crossing over between two genes is directly proportional to the distance between them.

-He used recombination frequencies to assign genes a linear position on a chromosome map and defined one map unit (centimorgan) as1% recombination frequency.

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Explain the importance of immunological memory cells. Describe in detail how and when memory cells arise and explain how they fo
Vlad1618 [11]

Explanation:

<em>Immunological memory</em> is the property of the immune system to store information about a stimulus so it can mount an effective response if it encounters the same stimulus again being this second response quicker and stronger even after years since the first encounter.

This kind of response is dependent on many subpopulations within T and B lymphocytes and NK cells. When encountering an antigen, B cells recognize it by membrane antibody specifically binding to the antigen and then being activated to expand rapidly with their progeny clones differentiating into plasma and memory B cells, these last ones have a long life span to remain in the body, ready when another encounter with the same stimulus occurs, this is how the basis for effective immunizations happens.

I hope you find this information useful! Good luck!

4 0
4 years ago
During the breakdown of polymers, which of the following reactions takes place?
fomenos

Answer: Option A."Hydrolysis"

Explanation:

Polymers breaks down into monomers following hydrolysis reaction.

hydrolysis is a chemical reaction that occurs when a water molecule inserts across the bond.

In hydrolysis reactions, the polymer breaks or divide into two components one part that gains hydroxyl molecule (OH–) and the other part that gains gains a hydrogen atom (H+) due to split of water molecule.

Hence, the correct option is A.

8 0
4 years ago
Which term refers to the behavior of two species attempting to use the same living space food source and water source?
Ivanshal [37]
<span>Competition occurs when members of different species compete for the same resource. </span>
5 0
4 years ago
The consequences of particular diseases are features of _____.
USPshnik [31]
The answer would be: <span>secondary aging.</span>

There is two type of aging, primary and secondary aging. Primary aging is the one that happens because of the age so it can't be prevented. Secondary aging happens because of bad diet and disease, so it can be prevented by doing healthy lifestyle or medicine.
8 0
4 years ago
Sympathetic nerve fibers are not associated with situations involving __________.
dimaraw [331]

Answer:

Digestion

Explanation:

The parasympathetic division handles things that stimulate digestion.

7 0
3 years ago
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