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Veronika [31]
3 years ago
6

Which of the following must exist in a population before natural selection can act upon that population? A. genetic variation am

ong individuals B. variation among individuals caused by environmental factors C. sexual reproduction (random fertilization) D. A and C only E. A, B and C
Biology
1 answer:
just olya [345]3 years ago
7 0
<h2>Answer is Option "A"</h2>

Explanation:

  • Genetic variation is the variation in alleles and genes, both within and among populations. Think of a population as a family unit. Within your family of closely-related individuals there is genetic variation. Within a neighbourhood, there are many families, and so there is also genetic variation among that larger group
  • Genetic variation can be identified through either continuous or discrete traits. Continuous traits are traits that vary continuously, such as height and weight. Discrete traits are traits that can only be measured discretely, such as tongue rolling; you either can or can't do this
  • There are three sources of genetic variation: mutation, gene flow, and sexual reproduction.A mutation is simply a change in the DNA. Mutations themselves are not very common and are usually harmful to a population.Because of this, mutations are usually selected against through evolutionary processes
  • Hence, the right answer is option A "genetic variation among individuals"
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The ABO blood group assorts independently of the Rhesus (Rh) blood group and the MN blood group. Three alleles, IA , IB , and i,
Eva8 [605]

Answer:

Part 1:

The mother’s genotype is ii, rr, MN

The father’s genotype is IAIA/IAi, Rr, MM

Part 2:

Approximately 1/32 (3.125%) of children can be expected to have the stated blood types.

Explanation:

Part 1:

The mother has blood types 0, Rh- and MN. Therefore, her genotype has to be ii, rr, MN.

The father has ABO type A. His ABO genotype may therefore be either IAIA or IAi, as both are compatible with type A offspring with a type 0 mother. His Rh genotype must be rr, since his Rh- child necessarily has to have inherited one r allele from each parent. Finally, his MN genotype has to be MM since both alleles are codominant.

Part 2:

Using the given data, we build the following Punnett chart:

                IA R N     IA r N     i R N     i r N    

IA R M

IA R N

IA r M

IA r N

IB R M

IB R N

IB r M                                                    X

IB r N                                                              

Note that, of all 32 possible combinations, only a single one of them (marked with “X” produces a genotype which matches the desired blood type, as follows:

genotype: IBi, rr, MN

blood type: B, Rh-, MN

3 0
3 years ago
Some skeletal traits that define modren homosapiens are a small face, high rounded skull, small jaws, bony chin , vertical and h
Lubov Fominskaja [6]

Some skeletal traits that define modern homo sapiens are a small face, high rounded skull, small jaws, bony chin , vertical and high forehead, a narrow nasal aperture, narrow upper body and long legs is known as mental eminence.

<h3>What are skeletal traits?</h3>
  • The morphological diversity of the domestic dog serves as an example of how mammalian skeletal traits may evolve quickly and undergo significant modifications.
  • Here, we employ principal component analysis to identify systems of features characterizing skeletal traits in a population of Portuguese Water Dogs.
  • Through this research, phenotypic variation is divided into separate parts that can be utilized to analyze the genetic networks controlling intricate skeletal traits.
  • We demonstrate that unlinked quantitative trait loci associated with these major components separately support both inverse correlations between structures and correlations within skeletal traits (for example, within the skull or among the bones of the limbs) (e.g., skull vs. limb bones).

To learn more about skeletal traits with the given link

brainly.com/question/13469439

#SPJ4

6 0
1 year ago
Umm yeah I’m doing old work anybody wanna help
Andrei [34K]
I believe is A I’ve learned that in 8th grade I think
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NAME that ORGANELLE!!!! please...
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ER, golgi, or mitochondria ‍♀️
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How do ships float in water​
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The air that is inside a ship is much less dense than water. That's what keeps it floating! ... As a ship is set in water, it pushes down and displaces an amount of water equal to its weight

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