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3 years ago

Explain why a raft floats higher in the ocean than in a river (worth 20 points im nice)

1 answer:

3 0

Objects float higher in salt water than in fresh water. ... Therefore, a floating boat displaces exactly its own weight of water, so it will need to displace less of the denser salt water than it would the less dense fresh water.

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Where are the sides of a DNA molecule made of

Yuri [45]

Answer:

alternating sugar and phosphate

Explanation:

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3 years ago

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In a hardy-weinberg population with two alleles, a and a, that are in equilibrium, the frequency of the allele a is 0. 3. What i

zavuch27 [327]

Here, given-

homozygous alleles 'a' have a frequency of 0.3.

Also the alleles are in equilibrium in a Hardy-Weinberg population. The frequency of individuals that are homozygous for this allele are= 0.49.

The Hardy-Weinberg equilibrium can be defined as the principle which states that the variation in the genetic makeup of a population remains constant and unchanged till there are no external interferences, influencing the population.

Calculation-

$p + q = 1\\0.3 + q= 1\\q= 1- 0.3\\\\q= 0.7$

Then to find the frequency of the individuals homozygous for this allele the following formula needs to be used-

$p^{2} + 2pq + q^{2} =1$

$p^{2} = dominant homozygous frequency\\2pq= heterozygous frequency\\q^{2} = recessive homozygous frequency\\$

Thus, the individuals homozygous for the allele can be calculated by $q^{2} = (0.7)^{2} \\= 0.49$

Learn more about the Hardy-Weinberg equilibrium here-

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2 years ago

When animals excrete nitrogenous wastes into the soil certain soil bacteria convert these wastes into nitrates, which are absorb

enot [183]

Decomposers.

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3 years ago

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Which type of selection tends to increase genetic variation? A. Disruptive selection B. Directional selection C. Stabilizing sel

aliina [53]

Answer:

Which type of selection tends to increase genetic variation? A. Disruptive selection B. Directional selection C. Stabilizing selection

The Answer is option A (Disruptive selection)

Explanation:

Selection can either shift the mean value of a trait, reduce the trait's variation, or increase its variation.

Genetic variation which allows natural selection to increase or decrease frequency of alleles already in the population is a source of phenotypic variation as it refers to differences in all the hereditary information of members of the same species.

Disruptive Selection is important in maintaining variation and initiating speciation as it Increases Variation by favoring alleles corresponding to more extreme phenotypes. But for it to occur, the mean phenotype has to experience the lowest fitness. Disruptive selection affects the frequency distributions of alleles and genotypes within a population.

Disruptive selection is based on the variance of a trait in a population as it increases genetic variance by equalizing the frequencies of existing alleles at polymorphic loci (a genetic loci with two or more alleles). Disruptive selection maintains and may even increase variation in natural populations by favoring extreme phenotypes, individuals with extreme values for a trait have greater reproductive success than individuals with intermediate values.

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3 years ago

Why is it not safe to touch electricity equipment with wet hand?

Sliva [168]

Answer:

We should not touch electrical appliances with wet hands because our body is a good conductor of electricity and since we may get electric shocks. ... Also one should avoid getting wet while touching electrical appliances because water is also a conductor not pure one though

Explanation:

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3 years ago

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