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mr_godi [17]
2 years ago
13

The presence of ________ dramatically increases the speed at which an action potential moves along an axon.

Biology
1 answer:
wlad13 [49]2 years ago
8 0

Answer:

Myelin

Explanation:

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Q:- In dogs, the Mexican hairless phenotype never breeds true. When Mexican hairless are interbred the offspring are 2/3 hairles
drek231 [11]

Explanation:

The problem says that the hairless phenotype never breeds true. That means that it's not the result of a homozygous genotype (H₁H₁ or H₂H₂), so it is caused by the heterozygous genotype (H₁H₂).

The <u>expected </u>offspring from the cross between two Mexican hairless would be:

<h3>P                 H₁H₂  x  H₁H₂</h3><h3>F1    1/4 H₁H₁,  2/4 H₁H₂ and 1/4 H₂H₂.</h3>

And the <u>expected</u> phenotypic ratio 3:1. However, the observed offspring shows a 2:1 ratio. What's happening?

If the observed phenotypic ratio in the offspring of a monohybrid cross (a single gene with two alleles) is 2:1, we can suspect that one of the genotypes is lethal in homozygosis and therefore does not appear in the progeny (the puppies are born dead).

If we proposed that the H₂ allele is lethal in homozygosis, then:

  • The H₁H₁ genotype would cause normal puppies --> 1
  • The H₁H₂ genotype would cause hairless puppies --> 2
  • The H₂H₂ is lethal and causes the death of puppies --> 0

The phenotypic ratios change to 2:1, as observed in the experiment.

7 0
3 years ago
What membrane protects the brain and spinal cord that circulates cerebral spinal fluid (csf) g?
nata0808 [166]
Meninges are membranes that cover and protect the brain and spinal cord.
There are three layers of meninges: Dura mater (closest to the bone), Arachnoid loosely around the brain, Pia mater is closely attached to the brain and spinal cord surface.
5 0
3 years ago
Use the scenario to answer the questions.
Gala2k [10]

Answer:

The energy flows from the rhinoceros to the tick, and then from the tick to the oxpecker.

Explanation:

The ticks suck the blood from the rhinos, and the oxpecker eat the ticks.

4 0
3 years ago
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¿Para qué se reproducen los seres vivos?
inessss [21]
Nut bien. Owns sho Mina
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I give the cells energy. Which organell
Dmitrij [34]

Answer:

Explanation:

Cell memeberane

4 0
3 years ago
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