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3 years ago

What structures have parasite worms lost? What structures/organs are expanded?

Biology

1 answer:

Ne4ueva [31]3 years ago

6 0

Explanation:

Something that is lacking, is a circulatory system. Instead of a typical circulatory system flatworms exchange oxygen with the air outside through diffusion. This is the process by which gases will pass through a membrane from an area of high concentration to an area of low concentration.

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The margins of parietal bone

natali 33 [55]

A] frontal is the answer

7 0

3 years ago

pThe probability of having an offspring with both the dominant phenotypes for both genes is equal to the product of the individu

Elena-2011 [213]

The product probability rule states P(A∩B) = P(A) x P(B). In the exposed example, the probability of having a dominant phenotype is 9/16.

<h3>What is the product probability rule?</h3>

The product probability rule allows us to calculate the probability of occurrence of event A and event B at the same time.

It is about a joint probability of two or more events that might happen simultaneously, not excluding each other.

This rule is based on the dependence or independence of the events. If two events A and B are independent of each other, the occurrence of one of them does not affect the occurrence of the other one.

For independent events, the rule establishes that, given two different events A and B, the probability of occurrence of both together is

P(A∩B) = P(A) x P(B)

The probability of inheriting one of the alleles from each parent is 0.5 (beacause each parent has two alleles).

According to this, the probability of having a dominant phenotype for both traits depends on the paretal genotypes.

For instance, let us analyze the cross between two dihybrid individuals AaBb x AaBb.

Assuming the involved genes code for different traits and both are independent genes, for easier calculations, we can perform crosses that involve each of the genes separately -events-, and then multiply de results according to the genotype and phenotype we are interested in (A-B-)

Gene A

Parentals) Aa x Aa

Gametes) A a A a

Punnett square) A(1/2) a(1/2)

A(1/2) AA(1/4) Aa(1/4)

a(1/2) Aa(1/4) aa(1/4)

F1) Genotype

1/4 AA ⇒ 1/2A x 1/2A

2/4 = 1/2 Aa ⇒ (1/2A x 1/2a) + (1/2A x 1/2a)

1/4 aa ⇒ 1/2a x 1/2a

Phenotype

3/4 A- ⇒ 1/4AA + 2/4Aa

1/2 aa

Gene B

Parentals) Bb x Bb

Gametes) B b B b

Punnett square) B b

B BB Bb

b Bb bb

F1 Genotype

1/4 BB ⇒ 1/2B x 1/2B

2/4 = 1/2 Bb ⇒ (1/2B x 1/2b) + (1/2B x 1/2b)

1/4 bb ⇒ 1/2b x 1/2b

Phenotype

3/4 B- ⇒ 1/4 BB + 2/4 Bb

1/2 bb

The probability of having a dominant genotype and phenotype for both traits is,

Genotpe AABB ⇒ 1/4 AA x 1/4 BB = 1/16 AABB

Phenotype A-B- ⇒ 3/4 A- x 3/4 B- = 9/16 A-B-

You can learn more about the product probability rule in crosses at

brainly.com/question/13049972

brainly.com/question/14933381

4 0

3 years ago

Name for the collection of dna in the nucleus of eukaryotes cells

Lilit [14]

DNA in the nucleus of eukaryotic cells is collected into a chromatin.

A chromatin is a complex of nucleic acids (DNA or RNA) and proteins called histones which condense to form a chromosome during cell division.

In eukaryotic cells, it is found within the cell nucleus while in prokaryotes, it is found inside the nucleoid .

Its functions are;

1. to package DNA into a smaller volume to fit in the cell.

2. strengthen the DNA to allow mitosis and meiosis.

3. acts as a mechanism to control expression

The chromatin is easily recognized through staining. Its name literally means "colored material."

3 0

3 years ago

Is it true that we see color because of the sun

dolphi86 [110]

Yes.

The sun emits all colors of the rainbow more or less evenly and in physics, we call this combination "white". That is why we can see so many different colors in the natural world under the illumination of sunlight. If sunlight were purely green, then everything outside would look green or dark.

5 0

3 years ago

Read 2 more answers

_______ nerves are composed of preganglionic sympathetic axons that did not synapse in a sympathetic ganglion.

Bas_tet [7]

The answer is “Splanchnic Nerves”. Splanchnic Nerve are nerves that are composed of preganglionic sensitive axons, which were not able to synapse in a sensitive ganglion. Splanchnic nerves are matching instinctual nerves, which backs up to the innervation of the inner body parts. These are nerves that are transporting fibers of the autonomic nervous, as well as sensual fibers from the different body parts

3 0

3 years ago