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rewona [7]
3 years ago
6

Which class of molecules functions as chemical signals?

Biology
2 answers:
omeli [17]3 years ago
7 0
A hormone is a molecule that functions as a chemical signal. A hormone is a chemical released by a cell or a gland in one part of the body that sends out messages that affect cells in other parts of the organism. Endocrine hormone molecules are secreted (released) directly into the bloodstream. !
sweet [91]3 years ago
6 0

The answer is HORMONES

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Cross a person who does not have freckles and is heterozygous for dimples with a person who has
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Answer:

1. 1/2

2. 1/2

3. 1/4

Explanation:

Let the allele for freckles be A or a while that of dimples be B or b.

A person without freckles but heterozygous for dimples = aaBb

A person who has freckles (whose mother has no freckles) but no dimples = Aabb

      aaBb    x    Aabb

Offspring

4 AaBb - freckled and dimpled

4 Aabb - freckled and non dimpled

4 aaBb - non freckled and dimpled

4 aabb - non freckled and non dimpled

1. <em>Probability that the parents will have a dimpled child</em> = 8/16 or 1/2

2. <em>Probability that they will have a child with freckles</em> = 8/16 or 1/2

3. <em>Probability that they will have a child with freckles and dimples</em> = 4/16 or 1/4

<u>See the attached image for the Punnet's square analysis of the cross</u>

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3 years ago
List three important steps in the early development of life on Earth?
Dominik [7]
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seraphim [82]
The statement is true. DNA replication process happen during the cell cycle.
5 0
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Anuta_ua [19.1K]

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Explanation:

Just as breast and cervical cancer, ovarian cancer is exclusive to female humans.

Since, Mrs. Payne is a female, hence her ovaries should be screened for any cancerous growth.

Thus, Ovarian cancer is the answer

8 0
3 years ago
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