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frez [133]
2 years ago
11

21. Cells of the immune system are able to respond to the presence of

Biology
1 answer:
ratelena [41]2 years ago
8 0

Answer:

1.  antigens present on the invaders

Explanation:

Through the antigens present to the invaders the Cells of the immune system can easily able to respond and recognize.  During an infection, chemical signals attract phagocytes to places where the pathogen has invaded the body. 

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) Consider a pea plant- it has a gene controlling seed color- yellow Vs green; another gene controlling seed texture-smooth Vs w
lana [24]

Answer:

Yellow smooth  - 9

Yellow wrinkle - 3

Green smooth- 3

Green Wrinkle - 1

Explanation:

Let the green color of the seed be depicted by "G" and the yellow color of the seed be depicted by "g"

Let the smooth the seed be depicted by "R" and wrinkled seed be depicted by "r"

F1 cross -  

true breeding smooth green plant ( RRGG) and true breeding wrinkled yellow (rrgg)

F1 gamete will be RG, RG, rg, rg

F1 offspring will be RrGg , Thus all F1 offspring will be heterozygous smooth and yellow.  

Thus,  R is dominant over r and g is dominant over G

F2 Generation –  

RrGg x RrGg

Gametes will be RG, Rg, rG, rg

RG         Rg          rG           rg

RG RRGG RRGg RrGG RrGg

Rg RRGg RRgg RrGg Rrgg

rG RrGG RrGg rrGG rrGg

rg RrGg Rrgg rrGg rrgg

R is dominant over r and g is dominant over G

Genotypes are –  

RRGG - 1  (Smooth Green)

RRGg-2  (Smooth yellow)

RrGG-2  (Smooth Green)

RrGg-4  (Smooth yellow)

RRgg- 1  (smooth yellow)

Rrgg – 2  (Smooth yellow)

rrGG – 1  (wrinkled Green)

rrGg – 2  (Wrinkled yellow)

rrgg – 1  (wrinkled yellow)

Yellow smooth  - 9

Yellow wrinkle - 3

Green smooth- 3

Green Wrinkle - 1

4 0
2 years ago
What will happen to all organisms at the end of their life cycle
dangina [55]

Answer:

They will all die!

Explanation:

7 0
3 years ago
Read 2 more answers
WILL MARK BRAINLIEST AND WORTH 25 PTS!!!!!
slamgirl [31]

Crossing over is termed as a process by which genetic materials are exchanged by non-sister chromatids during meiosis.

Crossing over results in the new combination of information in genetic for, the cell for a specific trait.

 It ensures that organisms are identical from one generation to another. Genetic recombination allows variations in genetic materials which are passed through generations.



3 0
3 years ago
Read 2 more answers
Describe two differences between Earth’s inner core and Earth’s outer core.
Juliette [100K]

Answer:

The inner vore is hotter than the outer and they are dufferent sizes

Hopw this helped u

3 0
3 years ago
What does the theory of evolution contribute to conservation biology?
Ivan

Answer:

ANSWER: C

hope it helps

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6 0
2 years ago
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