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m_a_m_a [10]
3 years ago
9

In which phylum do organs and organ systems first appear?

Biology
2 answers:
Klio2033 [76]3 years ago
5 0

Answer:

Platyhelminthes

Explanation:

Platyhelminthes, flatworms. this tissue covers the whole surface of the body. It is made up of cells closely packed and ranged in one or more layers.

vodomira [7]3 years ago
5 0

Answer: flatworms

Explanation:  Platyhelminthes, flatworms. this tissue covers the whole surface of the body. It is made up of cells closely packed and ranged in one or more layers.

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Suppose that extra fingers and toes are caused by a recessive trait, but it appears in only 60% of homozygous recessive individu
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Answer:

<h2> (1/4 * 60) </h2><h2>The probability. that child will have extra fingers and toes are = 0.15 </h2>

Explanation:

As given; extra fingers and toes are caused by a recessive trait.

Penetrance= 60%.

Parents are heterozygous, assume  Ff and Ff

F is dominant over f, and ff are homozygous recessive.

Ff crossed with Ff

Progeny are; FF, Ff, Ff and ff.

ff are homozygous recessive, as given that extra fingers and toes are caused by a recessive trait, so 1/4 will show the trait.

But according to 60% penetrance the trait will occur in = (1/4 * 60) =15% or 0.15 progeny will show the trait .

The probability, that child will have extra fingers and toes are = 0.15

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