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kicyunya [14]
2 years ago
5

Please help me this is science

Biology
1 answer:
-BARSIC- [3]2 years ago
8 0

Answer:

Orgams

Explanation:

Organs

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Colorblindness is an X-linked recessive trait. Samantha is colorblind and her husband, Rick, has normal vision. What is the prob
pav-90 [236]

Considering the whole progeny, there are 50% of probabilities of having a colorblind son. Considering only boys, there are 100% chances of having a colorblind son.

<h3>What is color blindness?</h3>

Color-blindness is a disfunction characterized by an alteration in color perception.

This alteration might affect perception from only partial confusion and difficulties in distinguishing some tones of green and red, up to no chromatic distinction.

Color-blindness is an X-linked condition.

  • Women that are h0m0zyg0us recessive will be completely color-blinded (X⁺X⁺),

  • Heter0zyg0us woman has partial color-blindness (X⁺X⁻).

  • Men are or are not color-blinded (X⁺Y or X⁻Y).

<h3>Available data</h3>
  • color-blindness is an X-linked recessive condition
  • X⁻ represents the X chromosome carrying the color blindness allele.
  • The allele for color blindness is recessive to the normal form of the gene, X ⁺.
  • Samantha is colorblind.
  • Rick has normal vision.

⇒ If Samantha is color-blind, then her genotype is X⁻X⁻.

⇒ If Rick has normal vision, then his genotype is X⁺Y.

Cross: Samantha and Rick

Parentals)    X⁻X⁻     x      X⁺Y

Gametes)  X⁻    X⁻         X⁺    Y

Punnett square)           X⁻               X⁻

                         X⁺       X⁺X⁻           X⁺X⁻

                          Y        X⁻Y             X⁻Y

F1) 2/4 = 1/2 = 50% of the progeny is expected to be heter0zyg0us expressing partial-color blindness, X⁺X⁻.

     2/4 = 1/2 = 50% of the progeny is expected to be completely color-blinded, X⁺Y.

     100% of the girls are expected to be partial-color blinded, X⁺X⁻.

     100% of the boys are expected to be color blinded, X⁻Y.

Answer: You can express your answer in two ways,

  • 4/4 = 100% of probabilities of having a colorblind son (you are only considering boys in your answer).

             

  • 1/2 = 50% of chances of having a colorblind son among the whole progeny (this answer includes girls as well).

You ca learn more about color-blindness at

brainly.com/question/25621649

brainly.com/question/4299904

4 0
2 years ago
Action potential in a motor neuron triggers the release of what neurotransmitter?
vodomira [7]

Answer:

Action potential in a motor neuron triggers the release of acetylcholine (ACh) neurotransmitter.

Explanation:

Acetylcholine: It is a neurotransmitter released by motor neurons which bind to the receptors end plates of the motor. When an action potential travel down the motor neuron's axon, neurotransmitter release occurs resulting in an influx of calcium and altered permeability of the synaptic terminal membrane.

The Ca2+ ions allow synaptic vesicles to move and bind with the presynaptic membrane which is present on the neuron and released neurotransmitter from the vesicles into the synaptic cleft. Once it's released ACh diffusion occurs across the synaptic cleft to the motor end plate, and binds with ACh receptor. As the neurotransmitter ACh binds, these ions channel open and sodium ions cross the membrane into the muscle cells.

In this phase reduction of voltage inside and outside the cell occurs, which is known as depolarization. When ACh binds to the motor end plate this depolarization is known as end plate potential. Then depolarization spread with the sarcolemma and creating an action potential. This action potential moves the entire cell and creating a wave of depolarization.

5 0
2 years ago
Which of the following muscles adducts the arm?
enyata [817]

Answer:

c

Explanation:

Adduction is accomplished primarily by the pectoralis major, latissimus dorsi, teres major, triceps, and coracobrachialis.

5 0
2 years ago
Airplanes reach cruising altitudes at the lower part of the Earth's stratosphere. This portion of the atmosphere is made up most
Lerok [7]

Answer:

The stratosphere is a layer of Earth's atmosphere. ... The troposphere, the lowest layer, is right below the stratosphere. ... Because of this, jet aircraft and weather balloons reach their maximum operational altitudes within the stratosphere. ... from the bottom of the stratosphere up to altitudes of 40 or 50 km (25 to 31 miles).

Explanation:

6 0
3 years ago
The three major substances removed from the blood by the kidneys are:
vlada-n [284]
The answer to this question is salts, excess water, and sugars
7 0
3 years ago
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