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Arturiano [62]
3 years ago
5

A scientist tries to mate the two similar-looking fruit flies Drosophila melanogaster and Drosophila simulans. But he finds that

they are unable to produce viable offspring.What kind of evolutionary barrier could this be?
Chromosomal
Postzygotic
Physical
Biology
1 answer:
Alex Ar [27]3 years ago
4 0
Your answer is postgotic 
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1.<br> It's good to give____<br> food to your body.
EastWind [94]

Answer:

It's good to give healthy food to your body.

Explanation:

Hope this helps

-A Helping Friend (mark brainliest pls)

7 0
3 years ago
A scientist is using a species of green algae to study the electron transport chain in photosynthesis. He uses a laser to inacti
jeka94

Answer:

D) In case 1, both PS I and PS II completely lose function; in case 2, a proton gradient is still produced.

Explanation:

The light dependent reaction of photosynthesis, which produces the ATP and NADPH needed in the light independent stage of the process, includes complexes of proteins and pigments called PHOTOSYSTEMS. These photosystems (I and II) are key to the functionality of the light dependent reactions in the thylakoid.

The major pigment present in both photosystems is CHLOROPHYLL A, which absorbs light energy and transfers electrons to the reaction center. Chlorophyll B is only an accessory pigment meaning it can be done without. Hence, if all of the chlorophyll A is inactivated in the algae but leaves chlorophyll B intact as in case 1, both PS I and PS II will lose their function because Chlorophyll A is the major pigment that absorbs light energy in both photosystems.

In case 2, if PS I is inhibited and PS II is unaffected, a PROTON GRADIENT WILL STILL BE PRODUCED because the splitting of water into protons (H+) and electrons (e-) occurs in PSII. Hence, H+ ions can still be pumped into the inner membrane of the thylakoid in order to build a proton gradient even without the occurrence of PS I.

3 0
3 years ago
When the DNA molecule folds, coils and super coils to fit in the cell what structure does it form?
Alexeev081 [22]

Answer:

<h2>A. Chromosome</h2>

Explanation:

In intermediate phase of cell cycle, DNA replication occurs (in S-phase), so in inter phase, DNA become unfolded and in relaxed state and is available for replicating machinery.

When cell enter into prophase, DNA folds, coils and super coils and finally become in condensed form, which can be seen by microscope.

So this compact form of DNA is called as chromosome.

In humans. there are total 46 chromosomes.

5 0
3 years ago
Read 2 more answers
A woman who is breastfeeding is not able to eat enough food for two weeks because of a lack of money. What effect will it have o
NikAS [45]

Answer:

There will not be any effect because the body will continue to produce enough.

Explanation:

Producing breast milk to satisfy a starving newborn is an arduous and energy-intensive task - about 500 calories a day. Therefore, it is important that moms a little more than normal. If the mother eats little, her body will still produce good quality milk, but she will run out of energy. This can also slow the recovery of your body after childbirth.

What determines milk production is how often the baby breastfeeds or how much more the mother empties her breasts. That is, the more the baby suckles, the more milk the mother will have. This milk will always be the amount of nutrients a baby needs, regardless of whether or not the mother has eaten. But if the mother does not eat, she may have health problems.

8 0
3 years ago
Some students at a middle school conducted a laboratory investigation to learn more about the physical properties of different e
TiliK225 [7]

Answer:

A

Explanation:

1. The colour is non metallic.

2. properties of metal solidness is not there, because of results of hammer experiment.

3. Physical consistency is not solid.

Etc.

4 0
3 years ago
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