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3 years ago

What determines whether a phenotype occurs more frequent or not in certain population?

Biology

2 answers:

insens350 [35]3 years ago

5 0

Answer:

The selection pressure for or against that phenotype and whether the phenotype increases the reproductive fitness of an organism.

Explanation:

Selection pressures would include predation and ability to find food etc. Traits such as coat colour or agility which aid animals in these tasks would favour their survival and hence be selected for in the population. Through natural selection, these phenotypes will become more frequent in the population.

Traits that improve the reproductive success such as the ability to find mate would also increase the probability of genes being passed down to their offsprings which would ultimately affect the allele frequency in the gene pool. A trait which does not affect reproductive success in humans is the human lifespan hence it can be observed that there is no selection pressure to favour people with longer lifespan. (the increase in human lifespan over the years is due to the development of healthcare and technology)

avanturin [10]3 years ago

3 0

Adaptation

The idea of "survival of the fittest" applies here. The phenotypes of the organisms the survive are the ones that get passed on to future generations while those of organisms who die off do not pass their phenotypes. Only the phenotypes that are better suited to the environment get passed on and, therefore, occurs more frequently in their populations.

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3 years ago

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Which of the following staements are false? A a disturbance in an ecosystem is an even that changes the availabity of resources

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In cucumbers, dull fruit (D) is dominant over glossy (d) fruit, orange friut (R) is dominant over cream fruit (r), and bitter co

stiv31 [10]

Explanation:

Dull fruit (D) is dominant over glossy (d) fruit.
Orange friut (R) is dominant over cream fruit (r).
Bitter cotyledon (B) is dominant over non-bitter cotyledons (b).

The three genes are independent.

A plant homozygous for dull, orange fruit and bitter cotyledons has the genotype <em>DDRRBB</em><em>.</em>
A plant homozygous for glossy, cream fruit and non-bitter cotyledons has the genotype <em>ddrrbb</em>.

100% of the F1 will have dull, orange fruit and bitter cotyledons and will be heterozygous for all genes: <em>DdRrBb</em>.

<u>The F2 will have 8 possible phenotypes:</u>

27 D_R_B dull, orange fruit and bitter cotyledons
9 D_R_bb dull, orange fruit and non-bitter cotyledons
9 D_rrB_ dull, cream fruit and bitter cotyledons
3 D_rrbb dull, cream fruit and non-bitter cotyledons
9 ddR_B_ glossy, orange fruit and bitter cotyledons
3 ddR_bb glossy, orange fruit and non-bitter cotyledons
3 ddrrB_ glossy, cream fruit and bitter cotyledons
1 ddrrbb glossy, cream fruit and non-bitter cotyledons

An F1 plant is crossed with a plant that has glossy, cream fruit and non-bitter cotyledons.

<h3>DdRrBb x ddrrbb </h3>

The F1 individual can produce 8 types of gametes: DRB, DRb, DrB, Drb, dRB, dRb, drB and drb. The cream fruit and non-bitter cotyledons individual can only produce drb gametes. This cross also produces a progeny with the following genotypes and phenotypic proportions:

8 DdRrBb dull, orange fruit and bitter cotyledons
8 DdRrbb dull, orange fruit and non-bitter cotyledons
8 DdrrBb dull, cream fruit and bitter cotyledons
8 Ddrrbb dull, cream fruit and non-bitter cotyledons
8 ddRrBb glossy, orange fruit and bitter cotyledons
8 ddRrbb glossy, orange fruit and non-bitter cotyledons
8 ddrrBb glossy, cream fruit and bitter cotyledons
8 ddrrbb glossy, cream fruit and non-bitter cotyledons

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3 years ago

What determines whether a phenotype occurs more frequent or not in certain population? ​

What determines whether a phenotype occurs more frequent or not in certain population?