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Anna11 [10]
2 years ago
15

Which of the following body systems do both roundworms and flatworms lack?

Biology
2 answers:
lesantik [10]2 years ago
8 0
I think the answer may be D. But don’t answer yet, I may be wrong.
andrew11 [14]2 years ago
4 0

Answer:

the correct answer is option A.

Explanation:

Roundworms and flatworms cells are close to the animal's outer surface which help them absorbtion. Both roundworm and flatworm use diffusion to respire and for circulation of substances around their body.

They lack circular muscles so only way to undulate is from side to side. They does not need to circulate oxygen they simply diffuse it from skin.

Thus, the correct answer is option A.

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2 years ago
A man and a woman are both carriers for two autosomal recessive disorders, PKU (chromosome 12) and cystic fibrosis (chromosome 7
ValentinkaMS [17]

Answer:

Pr= (3/16)

Explanation:

It was stated that both the man and the woman are both carriers for two autosomal recessive disorders, PKU (chromosome 12) and cystic fibrosis (chromosome 7).

∴ let Aa¹Bb° represent the traits in the Man

Where;

Aa¹ = carrier of PKU

Bb° = carrier of cystic fibrosis

Also, let Cc¹Dd° represent the traits in the woman

Where;

Cc¹ = carrier of PKU

Dd° = carrier of cystic fibrosis

Now, if Aa¹Bb° self-crossed, we'll have the F1 progeny as AB, Ab° , a¹B and a¹b°

also, if Cc¹Dd° self-crossed, we have CD, Cd° , c¹D and c¹d° as their F1 progeny

In the F2 generation, the dihybrid cross between the F1 generations will be:

AB, Ab° , a¹B, a¹b°    × CD, Cd° , c¹D, c¹d°

ACBD, ACb°D, a¹CBD, a¹Cb°D

ACBd°, ACb°d°, a¹CBd°, a¹Cb°d°

Ac¹BD, Ac¹b°D, a¹c¹BD, a¹c¹b°D

Ac¹Bd°, Ac¹b°d°, a¹c¹Bd°, a¹c¹b°d°

Only (a¹CBD, Ac¹BD, a¹c¹BD)  shows the probability that she will have PKU but not CF.

6 0
3 years ago
Which body system is responsible for
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Answer: B

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Hoped this helped!!!!!!

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3 years ago
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