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3 years ago

The suns density is greatest in which region

1 answer:

4 0

The sun is most dense at its core. It forms 10% of the sun's mass. Because of the enormous amount of gravity compression from all of the layers above it, the core is very hot and dense.

The sun's core is about 16 million K and has a density around 160 times that of water. This is over 20 times denser than the dense metal iron which has a density of 7 times that of water. However the sun's interior is still gaseous all the way to the very center because of the extreme temperatures. There is no molten rock like that found in the interior of the earth.

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How does the frogs tounge help survival

bagirrra123 [75]

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3 years ago

Define Internal and external fertilisation

Natali [406]

Answer:

see the file attached!!

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2 years ago

Explain the difference between conductive hearing loss and sensorinerual hearing loss

Otrada [13]

Conductive hearing loss is when sound cannot reach the inner ear.

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4 years ago

Read 2 more answers

Jezelyn needs to create a project that shows geographic isolation in action and decides to make a video which of the following w

Fynjy0 [20]

Question: Jezelyn needs to create a project that shows reproductive isolation in action and decides to make a video. Which of the following would make the best project?

a video that shows a large river that has penguin populations on both sides

a video that shows penguin species that have different mating dances a video that shows

a penguin that is laying eggs a video that shows penguins in a tidal pool and an open ocean

Answer:

The right option is a video that shows penguin species that have different mating dances.

Explanation:

Reproductive isolation is the inability of animals of closely-related species to interbreed with one another successfully as a result of various differences which can be ecological, behavioral, psychological, or genetic. From the question given above, the difference in the mating dances of the penguin species will not allow the animals to unite and mate. This condition describes reproductive isolation. Reproductive isolation is caused by mating differences, sterility or environmental barriers that eventually lead to the adaptive splitting into two species. However, reproductive isolation is not sufficient but internal barriers to gene flow are required for speciation to evolve.

3 0

3 years ago

Read 2 more answers

In a certain population of genetics students at Hardy-Weinberg equilibrium, the gene for attention span has two alleles, A and a

GrogVix [38]

Answer:

Beginning of term: a) 0.7; b) 0.3;

End of term: a) 0.67; b) 0.33; c) no

Explanation:

The population is in Hardy-Weinberg equilibrium, so the genotypic frequencies are:

AA = p²

Aa = 2pq

aa = q²

Where p is the frequency of the A allele and q is the frequency of the a allele.

<h3><u>Beginning of the term</u></h3>

Total population (N): 1000

aa individuals: 90

q² = 90/1000

q= √0.09

q=0.3

The frequency of the a allele is 0.3

a) p + q = 1

p = 1 - 0.3

p= 0.7

The frequency of the A allele is 0.7

<u>The initial number of students with each genotype was:</u>

aa = 90
AA = p² × N = 0.7 × 1000= 490
Aa = 2 × p × q × N = 2 × 0.7 × 0.3 × 1000 = 420

Number of students with each genotype:

AA = 490 - 280 = 210
Aa = 420
aa = 0

N = 630

a) The frequecny of the A allele can be calculated as:

p= (2 × AA + Aa)/ 2 × N

Because there are 2 × N number of alleles in the population and the A allele appears twice in the homozygous individuals and once in the heterozyogus.

p= (2 × 210 + 420)/ 2 × 630

p= 0.67

The frequency of the A allele is 0.67

q= 1-p =0.33

The frequency of the a allele is 0.33

c) The population is not at H-W equilibrium at the end of the term, because the observed genotypic frequencies are not those expected by the equilibrium.

Expected AA = p² × N = 0.67² × 630 = 283

Observed AA = 210

Expected Aa = 2pq × N = 2 × 0.67 × 0.33 × 630 = 279

Observed Aa= 420

Expected aa = q² × N = 0.33² × 630 = 69

Observed aa = 0

4 0

3 years ago