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3 years ago

Matter can undergo both chemical and physical changes. What indicates that the change was definitely

1 answer:

5 0

Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change.

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4. A male green parakeet breeds with a female blue parakeet: All the offspring are green. What trait is

Harman [31]

Answer:

4. Green

5. 1 Green : 1 Blue parakeet

6. 100% green offsprings

7. Violet color

8. 0%

9. 1 Yellow : 1 white sulfur butterflies

Explanation:

4. A dominant trait is that which masks the phenotypic expression of its contrasting trait in a gene. Hence, the cross between a green and blue parakeet produced offsprings that were all green because the green trait is dominant i.e. mask the expression of the blue trait.

5. An heterozygous green parakeet will have genotype:Gg while a homozgous blue parakeet will have genotype: gg. A cross between Gg and gg will produce offsprings with genotypes: Gg and gg in the proportion 2:2. This means the phenotypic ratio of Gg (green) and gg (blue) is 1:1.

6. A homozygous dominant parakeet means genotype, GG while a heterozygous green parakeet means genotype, Gg. GG and Gg, if crossed will produce offsprings with genotypes: GG, GG, Gg and Gg. Since the allele for green color (G) is dominant over the allele for blue color (g), all the offsprings i.e 100% will be green colored.

7. A purebred flower means a flower that produces only one type of color and is homozygous. Hence, let's say a purebred red flower will have genotype RR while a purebred violet flower will have genotype VV. Hence, these two purebreds will be crossed to produce offsprings that all possess genotype, VR. According to the question, they are all violet. This means that the allele for Violet color is masking the phenotypic expression of the red color. Hence, the Violet color is a dominant trait.

8. A homozygous Violet and red flower will have the genotypes: VV and RR respectively. A cross between them will produce an offspring with genotype, VR. Since the Violet allele is dominant, it will be phenotypically expressed over the red allele. Hence, none of the offsprings i.e. 0% will be red-colored.

9. A heterozygous sulfur butterfly will be Yy while a homozygous recessive sulfur butterfly will be yy. Where Y is yellow allele and y is white allele. If Yy and yy are crossed, offsprings with genotypes Yy and yy will be produced in the ratio 1:1. This means that the phenotypic ratio of the cross between a heterozygous sulfur butterfly (Yy) and a homozygous recessive sulfur butterfly (yy) is 1 Yellow sulfur butterfly: 1 white sulfur butterfly.

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3 years ago

Two years of dry weather are followed by two wet years, causing the grass population to rise. How will the increase in grass aff

Ulleksa [173]

Answer is;

The animal population in the environment will increase.

This is because the grass is the main producer in a habitat. Its plentifulness directly influences that of the consumers up the food web. Increase in grass population means reduced competition for primary consumers and their population will therefore increase. This will also reduce competition for secondary consumers and tertiary consumers up the chain.

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3 years ago

Which of the following is not a physiological mechanism regulated by timing?

Lady_Fox [76]

Answer:

Viral reproduction in a host cell.

Slow down its metabolic rate and lower its body temperature

Explanation:

Viral reproduction in a host cell is not associated with the physiological mechanism regulated by timing. The viral reproduction occurs in the host cell whenever the virus enters the host cell. The virus attaches itself to a host cell and injects its genetic material into it. For reproduction, virus use resources of the host cell to make more viruses and spreads in the neighboring cells. This reproduction does not depend on the specific time, it occurs when it penetrates in the host cell. Skunk slow down its metabolic rate and lower its body temperature when there is extreme cold and food shortages during the long winter months

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3 years ago

Which correctly lists the three processes that are affected by freeze and thaw cycles?

Paha777 [63]

Answer:

Slump creep and weathering

Explanation:

Freeze-thaw weathering occurs when water from rainfall or melt snow penetrate into cracks and the temperature is lowered than a liquid and freeze. The process where exposed rock is broken. It gives the landscape a new shape.

When the freeze occur it expands the rock and when the temperature increases above freezing the thaw ice further penetrate into the crack.

Weathering the breaking down of rock into smaller frequent affects freeze-thaw as it allows water to penetrate into cracks.

Slump is the downward movement of materials from rock surface, it allows material to move alone the rock surface liquid such as water can be allowed to move and penetrate cracks. crack rock fragment that results from freeze thawing are deposited at rock base and form smaller rocks

Creep is also the movements of weathered materials down the slope of rock surfaces. It could result from freeze thaw.

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3 years ago

The disaster medical assistance team works quickly to contain contaminants from a chemical plant explosion. afterward, personnel

dusya [7]

<span>Out of the following given choices;</span>

a. containment.

b. decontamination.

c. triage.

d. scene assessment

<span>The answer is B. This is also necessary to be performed on workers after a nuclear disaster that resulted to leakage of radioactive materials from the facility and after visiting a site that is considered to have a highly infectious organism. Decontamination is used to remove the material from a person or object and avoid it spreading to unaffected areas. Decontamination is also practiced in some medical settings. </span>

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3 years ago