Widow's peak, a pointed hairline on the forehead, is a genetic trait caused by a dominant allele. it can be traced back through a family's history using pedigree analysis. the pedigree shown here is of three generations of a family. notice that some individuals (shown in gray) have a widow's peak (w = dominant allele and w = recessive allele). this pedigree supports the fact that widow's peak is due to a dominant allele, because if it were due to a recessive allele and both parents show the recessive phenotype, then ________.

The right answer is c.

Our body is made up of about thirty thousand billion cells. Each of these cells contains hundreds of mitochondria that use the nutrients to produce the energy needed to perform all of our bodily functions. Some of this energy is dissipated as heat.

* If this energy is not enough because the outside temperature is very low, we shiver, because our muscles start to tremble. This friction of the muscles generates heat. In addition, brown adipose tissue can elevate TC by using as heat most of the energy produced by mitochondria. If the outside temperature is winter, the blood vessels in the skin contract to reduce heat loss on the body surface.

* If the TC is too high, we can dissipate heat through perspiration (evaporation of water on the surface of the body has a cooling effect) and by the exhalation of hot air.

The correct answer is: C. Convective zone, chromosphere, corona.

The Sun can be divided into six layers (from innermost to outermost):

1. Core-the interior of the Sun which produces heat and light

2. Radiative zone-high density; radiation

3. Convective zone

4. Photosphere – visible layer

5. Chromosphere

6. Corona

Answer:

Convective, chromosphere, corona best fits the order in which the sun is layered

Explanation:

Final answer:

The true statement about plants and consumers is that primary producers convert light energy through photosynthesis and consumers gain energy by feeding on them or on other consumers.

Explanation:

Primary consumers depend on energy from plants for survival, while higher consumers depend on energy from primary consumers. The statement that is also true about plants and consumers is that primary producers convert light energy by photosynthesis and consumers gain energy by feeding on them or other consumers which have consumed these producers.

Within ecosystems, the base of the food chain is typically occupied by photosynthetic organisms, referred to as producers. These producers, like plants or phytoplankton, harness solar energy and convert it into chemical energy through photosynthesis. Primary consumers, such as herbivores, directly consume these producers and gain their energy from them. Subsequent consumers, including secondary and tertiary consumers, obtain their energy by consuming organisms from the previous trophic levels.

It's important to clarify that primary producers do not convert light energy through chemosynthesis, but rather, through photosynthesis. While chemosynthesis is another form of biological energy conversion, it is not relevant to the typical processes that plants use to acquire energy.

Insulin mutations can result in diseases like type 1 diabetes, where there is a lack of insulin production. Injecting synthetic insulin can treat this condition.

Insulin is a hormone that helps cells take up glucose from the blood. Mutations in the gene that codes for insulin can lead to diseases like type 1 diabetes. In type 1 diabetes, there is a mutation in the insulin gene that prevents the production of insulin, resulting in high blood glucose levels. This can be treated by injecting synthetic insulin into the body from outside sources.

The statement which is describes an effect of the low density of frozen water in a lake when water in a lake freezes, it floats, providing insulation for organisms below. Thus, option C is correct.

Density has been defined as mass per unit volume it means that mass is present in one meter cube.

S.I unit of density is kg/meter^3.

Mathematically,

Density = Mass/Volume.

Water has been defined as the water present under the ground and water below the soil as well as in the crack of the earth. The percentage of freshwater in the world could be 30%. There are mainly three types of groundwater and these are hand-dug wells, springs, and drilled boreholes.

The water stored under the ground are obtained from rain and stored in the ground so that it can be used later. Ground water has very clean and fit for drinking and the reason could be that the soil present on top and work as filter and the groundwater has free from all microorganisms.

Therefore, The statement which is describes an effect of the low density of frozen water in a lake when water in a lake freezes, it floats, providing insulation for organisms below. Thus, option C is correct.

Learn more about density here:

https://brainly.com/question/15164682

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Answer:

The muscles in the stomach of the frog bend the spine forward, opposing the muscles in the back which bend the spine backwards.  The upper muscles in the chest help to push the upper limbs out using triceps brachii as extensors to jump, while the upper back muscles help to draw the upper limbs back in as well as biceps brachii.  The pectoralis major are responsible for moving the arms at the shoulders. The rectus abdominus bends the spine downward and also adds an extra layer of protection for the frogs internal organs.  There are muscles on top of the theigh such as the satorious, which extend the lower legs to kick out when jumping or swimming.  The tribalis anterior longus is a flexor of the foot, meaning it pulls the foot up, one uses this muscle when they lift their foot to take a step.  The gastrocenemius is an extensor for the foot, bending it down, used whenever a frog jumps.  

Answer:

0-

Explanation:

Answer:

its b

Explanation:

Final answer:

Plastics are made from petroleum-based products, which are finite resources being depleted, therefore, they are classified as nonrenewable resources. Therefore, the correct answer is D.

Explanation:

Plastics are synthetic materials commonly derived from petrochemicals such as crude oil. Because plastics are made from oil, which is a finite resource with reserves being depleted, a reasonable conclusion based on this information is:

D. Plastics require oil and therefore are nonrenewable resources.

The production of plastics does indeed lead to an increase in carbon emissions and contributes to global warming, as it requires a significant amount of energy and resources. The immense scale of plastic use and production has led to an increase in environmental concerns, including waste management, pollution, and depletion of natural reserves. While plastics may replace heavier materials like metal and glass, their environmentally friendly status is challenged by their impact throughout their lifecycle and their non-biodegradable nature, leading to large amounts of persistent waste.

Neurons and muscle cells perform different functions. In the body, these cells have the same basic parts. The function of muscle cells is contraction, while the function of neurons is to send nerve signals.

Neurons are the basic units of the nervous system and are responsible for sending electrical signals throughout the body. These signals may originate from various stimuli and are essential for different bodily functions such as movement, sensation, and thought processes. The structure of a neuron typically includes dendrites, which receive information, and an axon, through which the neuron sends its signals to other cells.

On the other hand, muscle cells are specialized for contraction and are essential for movement and bodily support. When a neuron sends an impulse to a muscle cell, it triggers the muscle to contract. This interaction is crucial for voluntary and involuntary movements within the body.

The correct question is:

Fill in the blanks:

Neurons and muscle cells perform different functions. In the body, these cells have the same ____. The function of muscle cells is _____, while the function of neurons is to send nerve signals.

Final answer:

Color blindness is caused by genetic factors affecting the cones in the retina and includes three types related to different cones. Vision of 20/300 is severely impaired, and LASIK surgery can correct this by reshaping the cornea. Presbyopia affects reading vision due to lens flexibility issues and may remain after LASIK surgery.

Explanation:

Color blindness is typically caused by genetic factors that affect the cones in the retina of the eye. The three types of color blindness are: protanopia (red), deuteranopia (green), and tritanopia (blue). Each type corresponds to the deficiency or absence of different cone types in the retina. In context of genetics, the Law of Dominance explains how a dominant allele can mask the presence of a recessive allele, which may relate to inheritance patterns in color blindness.

Regarding visual acuity, a measure of 20/300 indicates that what a person with normal vision can see at 300 feet, someone with a 20/300 vision sees at 20 feet, reflecting severe visual impairment. LASIK surgery corrects this by reshaping the cornea to correct the focus of light onto the retina.

For individuals with presbyopia, LASIK can correct distant vision but will not solve the issue of close-up focus required for reading because presbyopia is related to the eye's lens flexibility, which diminishes with age. The patient may still need reading glasses after LASIK. The procedure of LASIK involves a fixed percent uncertainty in the reshaping of the cornea, and those requiring greater correction have a higher risk of not achieving normal distant vision due to the greater variability in the surgical outcome.

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Answer:

The control of this experiment is the rat that received sugar in place of the drug.

Explanation:

In a scientific experiment, control is characterized by the individual (or object) who has not received what is being tested in the experiment. In the case of the above question, the experiment wants to test the effectiveness of a drug in fighting cancer. All rats received different doses of this medicine, except for one mouse that received sugar in place of the medicine. This mouse is the control of the experiment and will serve to compare how cancer is reduced in individuals who received the drug compared to those with cancer who did not receive the drug.

Out of the following given choices;

a) The enzyme must be stable to very high pressures.

b) The enzyme must be stable in the presence of hydrogen.

c) The enzyme must be stable both in the presence of detergents and to high pressures.

d) The enzyme must be stable both in the presence of detergents and to moderately high temperatures.

The answer is D. Subtilisin is a non-specific protease enzyme hence its use to remove protein stains. For its to be used with detergents it has to be stable in the presence of detergents. Since detergents work optimally in moderately high temperatures, Subtilisin must also be stable at the same temperatures.

Answer:

The answer would be hypothalamus. Hypothalamus is a part of the brain in which regulates the endocrine system.

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