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3 years ago

While studying ecosystems, Frederik reads the sentence

Biology

2 answers:

noname [10]3 years ago

4 0

Answer:

It incorrectly describes the two ecosystems in terms of

temperature.

Explanation:

VashaNatasha [74]3 years ago

3 0

Answer: It incorrectly describes the two ecosystems in terms of

temperature.

Explanation:

The ponds and lakes are the aquatic ecosystems that can be formed in low areas of land where water get collected. But differences between the lakes and ponds exists. The lakes are generally big, deep and plants can grow mostly on the edges due to the lack of sunlight in the lower depths. The ponds are small, shallow, the sunlight can even reach to the bottom, and the plants can be rooted at the substrate base these have more nutrients because of accumulation of plant and animal matter at the base.

The temperature of ponds and lakes may vary according to the season thus this can be said that the two aquatic ecosystems are incorrectly described.

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There is a population of Drosophila flies in a small fruit shop. Due to sudden mutation, the eye color of some of the flies chan

galben [10]

The answer is A. p2 = 0.36, 2pq = 0.48, q2 = 0.16.

Let's first distinguish alleles frequencies from genotypes frequencies:
p - a frequency of R allele,
q - a frequency of r allele,
p² - a frequency of RR genotype,
2pq - a frequency of Rr genotype,
q² - a frequency of rr genotype.

The gene frequency of allele r changes from 0.38 to 0.40, thus:
q = 0.40

Now, we will implement this in the following equation:
p + q = 1

If q = 0.40, then:
p + 0.40 = 1
⇒ p = 1 - 0.40
⇒ p = 0.60

Now, the frequencies of both alleles are know and it is easy to calculate the genotype frequencies:
- the frequency of RR genotype: p² = 0.60² = 0.36
- the frequency of Rr genotype: 2pq = 2 · 0.60 · 0.40 = 0.48
- the frequency of rr genotype: q² = 0.40² = 0.16

Therefore, the new genotype frequencies in that population are p2 = 0.36, 2pq = 0.48, q2 = 0.16.

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3 years ago

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Which endocrine gland(s communicate(s with the hypothalamus to control many body activities, including growth from infancy to ad

Advocard [28]

Pituitary gland is the endocrine gland that communicates with hypothalamus in our body growth.

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3 years ago

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How did this change the way you think about cities of the future?

dmitriy555 [2]

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n Drosophila melanogaster, forked bristles are caused by an allele (Xf) that is X linked and recessive to an allele for normal b

makkiz [27]

Answer:

Proportion of the F2 male with red eyes and forked bristle will be 1/4

Explanation:

forked bristles are caused by an allele (Xf) that is X linked and recessive to an allele for normal bristles (X+).

Brown eyes are caused by an allele (b) that is autosomal and recessive to an allele for red eyes (b+)

A female fly that is homozygous for normal bristles and red eyes mates with a male fly that has forked bristles and brown eyes

X+X+b+b+ x Xfbb

the F1 gives 1/2X+Xf 1/2b+b

1/2X+Y 1/2b+b

intercross of F1

Proportion of the F2 male with red eyes and forked bristle will be

forked bristle= Xfy = 1/2 and for red eyes 2/4= 1/2 = 1/2x1/2 =1/4

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3 years ago

The first land plants occurred in the Ordovician. What important function did they contribute to conditions on land that allowed

san4es73 [151]

Answer:

Explanation:

Land plants are one of the major support of life. Oxygen gases given as a waste product from plant is what human takes in as air to support life. Lands plant provides the major food we eat, which without men cannot survive.

Most medicines, herbs used in various ailment treatment are from land plant this makes them of immense important on the planet earth.

They help in maintaining the ecosystem by reducing the effect of global warming while making use of abundant carbon dioxide that is available in the atmosphere.

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