BIOLOGY HIGH SCHOOL

clonal selection of lymphocytes leads to the development of which type of cells? a. effector cells and b cells b. t cells and memory cells c. effector cells and memory cells

Answers

Answer 1
Answer:
b. t cells and memory cells

These immune cells produce a proper response chemical to combat the microbes. The initial exposure of the body to an infectious agent e.g. through a vaccine, triggers an immune response most of which rapidly diminishes after the vaccination.  However some cells of the immune system called lymphocytes remain with a memory of that pathogen.As a result, if the same pathogen infects a vaccinated person, the memory cells remember and recognize it . 

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In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (Rr) offspring of red (RR) and white (rr) homozygotes. Which of the following crosses would produce offspring in the ratio of 1 red:2 roan:1 white? A) red × white
B) roan × roan
C) white × roan
D) red × roan
E) The answer cannot be determined from the information provided.

Answers

The answer is B) roan x roan.

Let's summarize:
R - dominant allele,
r - recessive allele,
RR - dominant homozygous with red color,
rr - recessive homozygous with white color,
Rr - heterozygous with roan color.

If we cross two heterozygous (Rr):

Parents:         Rr     x     Rr
Offspring:      RR   Rr   Rr   rr

then, the offspring will be: 1 red (RR) : 2 roan (Rr, Rr ) : 1 white (rr).

Final answer:

The cross between roan (heterozygous) cattle would produce offspring in the ratio of 1 red: 2 roan: 1 white. This is a scenario of a monohybrid cross, yielding a 1:2:1 ratio in offspring.

Explanation:

In this genetics problem, 'R' represents red coat color gene, 'r' represents white coat color gene, and the combination 'Rr' gives a roan coat color. To get a 1:2:1 ratio of red:roan:white, the cross must be between two heterozygotes, or roan-colored cattle (Rr × Rr). So, the correct option is B) roan × roan. This type of cross, known as a monohybrid cross, yields a genotypic and phenotypic ratio of 1:2:1 (1 RR: 2 Rr: 1 rr) in the offspring.

Learn more about monohybrid cross here:

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What strategies do you incorporate when engaged in a strong discussion?

Answers

You can use many verbal strategies when engaged in a strong discussion, one technique is doing brain storm which is defined as a group collaborative conversation where the group discusses different ideas and hopefully synthesize and arrive at a conclusive idea. 

Detected with Lish sugar and in bloo​

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what i’m confused i’m

Mosquitoes must lay their eggs in standing water. What would most likely happen to the mosquito population in an ecosystem that experienced less rainfall than usual?A. The mosquito population would decrease in size.
B. The mosquito population would not experience any changes.
C. The mosquito population would disappear altogether.

Answers

I think it would be the first one, A. 
Hope this helps!!!

Which of these is an example of structural protein in plants?

Answers

The answer is Lignin
the answer for this question is Lignin

Oogamy always involves fertilization from gametes of different sizes.
a. True
b. False

Answers

Answer:

true

Explanation:
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