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adelina 88 [10]

2 years ago

10

Hunters kill all of the wolves in a region. The wolves mostly ate deer. Why might there be fewer deer a few years after the wolv

es are killed?

2 answers:

mixer [17]2 years ago

8 0

Because of the hunters in the deer region

In-s [12.5K]2 years ago

7 0

Answer:

cos da hunters kill the deer too, the hunters are like the plague

Explanation:

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Which statements describe the types of energy emitted by the Sun? CHECK ALL THAT APPLY

jok3333 [9.3K]

It would be 2. it emits all wavelengths in the electromagnetic spectrum

8 0

1 year ago

Read 2 more answers

Based on the results above, you study the settlement patterns of the three species. You establish transects on each of your expe

dem82 [27]

Answer:

c. Physical adaptations to the environment drive the distribution of all three species in the wild.

Explanation:

Options A and B refer to competition between species. The experiment was about the colonizing ability of the three species, and not the interaction among them. So these two options are not correct.

Option D states that species A is better adapted to the upper intertidal zone than the middle or lower. But the table shows that species A is equally adapted to colonize upper and middle intertidal zone, and less adapted to colonize lower zones.

The correct option is C. When these competing species coexist, this is because of niche partitioning or niche differentiation. If there is not any differentiation between them, the dominant species displaces the weak species. In the exposed example, the three species coexist in the middle and lower zones, which means that they probably have different niches and got adapted to living to their environments. This adaptation to different conditions is what leads to their distribution.

In the exposed example, species A and B can live in the upper intertidal zone, where species C can not live because they can not tolerate environmental conditions. The three species can live in the middle zone, but still, A and B are more adapted to this area than C. Among A and B, B is the most adapted to living in the upper and middle zones. Species C seems to be very adapted to live in the lower intertidal zone, where species A and B can also live, but are less adapted to this area, probably due to environmental conditions or due to their vulnerability to predation. In this last area, species A is less adapted.

3 0

2 years ago

In the fruit fly, Drosophila melanogaster, a spineless (no wing bristles) female fly is mated to a male that is claret (dark eye

Korolek [52]

Explanation:

We have three genes in the same chromosome and are trying to determine their order and relative distance to each other.

<u>The genes and possible alleles are:</u>

claret (c/c+)
spineless (s/s+)
hairless (h/h+)

All mutations are recessive: two copies of the mutant allele are needed for the fly to show that trait.

<u>Parental cross</u>

claret hairless male: $\frac{s^+\ c\ h}{s^+\ c \ h}$
spineless female: $\frac{s\ c^+\ h^+}{s\ c^+ \ h^+}$

Each parent can produce 1 type of gamete only, so the F1 will be homogeneous:

<u>F1</u>

<u> $\frac{\ s\ \ \ c^+\ \ h^+}{s^+\ \ c \ \ \ h}$ </u>

During meiosis, the F1 females can produce 8 types of gametes: 2 parentals and 6 recombinants (two of them, the result of a double crossing over).

If they are test crossed to homozygous recessive males (which can only produce a $\frac{s \ c\ h}{}$ gamete), the following phenotypes are obtained (I just write the alleles they inherited from the female fly, as the ones that came from the male are the same for all of them):

321 spineless (s c+ h+) ----> Parental
309 claret, hairless (s+ c h) ----> Parental
130 claret, spineless (s c h+) ----> Recombinant
140 hairless (s+ c+ h) ----> Recombinant
32 hairless, claret, spineless (s c h) ----> Recombinant
38 WT (s+ c+ h+) ----> Recombinant
18 claret (s+ c h+) ----> Double Recombinant
12 hairless, spineless (s c+ h) ----> Double Recombinant

The phenotypes observed in the highest frequency are always the parentals, and the ones in the lowest frequency are always the double recombinants.

<u>To determine the order of the genes:</u>

we have to write down the genotype of the F1 female three times, changing the order of the genes each time.
Then, we hypothesize what the double recombinant gametes would look like.
When the theoretical double recombinants we obtain are the same as the ones observed in the F2, we know that <em>that </em>is the correct order of the genes.

In this problem, only if the middle gene is h+/h the double crossing over gives us the observed double recombinant gametes, therefore <u>hairless</u> is the middle gene.

$\frac{s\ h^+\ c^+}{s^+\ h\ c}$

<u> Double recombinants:</u>

s h c+ ----> spineless hairless
s+ h+ c ----> claret

<u>To determine the distance between the genes:</u>

Genetic distance (m.u.) = Recombination Frequency x 100

Distance between the spineless and hairless genes:

$Distance \ [s-h]= \frac{number\ of\ recombinants \ [s-h]}{Total number of individuals} * 100\\\\\\Distance \ [s-h]= \frac{32+38+12+18}{1000} * 100\\\\Distance \ [s-h]= 10\ map\ units$

Distance between the hairless and claret genes:

$Distance \ [h-c]= \frac{130+140+12+18}{1000} * 100\\\\Distance \ [h-c]= 30\ map\ units$

<h3><u>The gene map for these genes is:</u></h3>

spineless -----------------hairless ---------------------------claret

10 m.u. 30 m.u.

3 0

1 year ago

Five friends looked at a piece of aluminum foil. They wondered what they would see if they could see inside an atom of aluminum.

babunello [35]

The answer is; Jane would be right.

The atom was discovered be more of empty space. The mass of an atom is mainly attributed to the mass of the nucleus which occupies a very small fraction of the size of the atom. The nucleus is Located in the center surrounded by orbiting electrons.

The Geiger–Marsden experiment, where alpha particles are accelerated onto a thin aluminum foil proved this theory by Ernest Rutherford. Some of the particles were deflected by the foil and this was attributed to the dense nucleus of the aluminum atoms in the foil. The other particles passed through because most of the atoms are made of empty space.

6 0

2 years ago

Tomato plants usually have hairy stems. Hairless stems are present in tomato plants that are homozygous recessive for this trait

iren [92.7K]

A is the correct answer

4 0

1 year ago