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Serggg [28]
4 years ago
8

During which period did the first vascular plants appear? A. Cambrian B. Ordovician C. Silurian D. Devonian

Biology
2 answers:
arsen [322]4 years ago
7 0
Psilopsids were he first vascular plants which were in C. Silurian period!
guapka [62]4 years ago
5 0
<span>C. Silurian
</span>The first jawed fishes and uniramians (like insects, centipedes and millipedes) appeared during the Silurian (over 400 million years<span> ago). First vascular plants (plants with water-conducting tissue as compared with non-vascular plants like mosses) appear on land (Cooksonia is the first known).</span>
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The pumping of the heart is tied to the respiratory system

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6. Edwards syndrome is a genetic condition in which a person has three copies of
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The sun weathers rocks by _____.
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Are similar to basophils, but reside in tissues rather than circulating in the blood.
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Answer:

The correct answer is mast cells.

Explanation:

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4 years ago
In corn, the allele A allows the deposition of anthocyanin (blue) pigment in the kernels (seeds), while aa plants have yellow ke
lara31 [8.8K]

Answer:

<h2>A) Yes, 12 mu</h2><h2>B) AaWw</h2><h2>C) 0.25%</h2><h2 />

Explanation:

As given,

Allele A for  blue anthocynin.

aa for yellow kernel;

at  second locus;

W produce smooth kernel,

ww for wrinkled kernel;

Parents as given are:  AaWw and aaww

Progeny are:

blue smooth ( AaWw)= 1447;

blue wrinkle (Aaww)= 169;

yellow smooth (aaWw)= 186;

yellow wirnked (aaww)= 1510

a)

Recombinant progeny are  169+ 186= 355

non- recombinant progeny are = 1447+ 1510= 2957

so recombination frequency (RF)= 346/2957×100= 12.0054%

So a and w are linked genes.

They are 12 mu far away from each other.

b) Blue smooth parent= AaWw.

c) Aaww crossed with  aaWw

progeny are= AaWw, Aaww, aaWw, aaww,

They all are produced in same proportion =0.25% or 1/4.

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