help i don’t know the answer

Answer:

I think the answer is option 3

Explanation:

Answer:

The sickle-cell gene.

Explanation:

The sickle cell mutation is in the gene encoding the β subunit. The sickle cell gene is located on the short arm (p) of chromosome 11, at position 15.5. Sickle cell anemia is a genopathy caused by a single mutation that results in the substitution of an amino acid in the β chains of the tetrameric protein hemoglobin. It characterized by the presence of sickle cells in the bloodstream, which are red cells or sickle-shaped erythrocytes. This form causes difficulty in the circulation of red blood cells. Confirmation of sickle cell anemia is obtained through tests that determine the presence and relative amount of hemoglobin S in a blood sample, that is, by checking the phenomenon of sickle cell disease, in a drop of blood between the slide and covers objects, or the presence of hemoglobin S by means of electrophoresis.

Answer:

Antibiotic resistance evolves naturally via natural selection through random mutation, but it could also be engineered by applying an evolutionary stress on a population. Once such a gene is generated, bacteria can then transfer the genetic information in a horizontal fashion (between individuals) by plasmid exchange

Answer:

THIS IS CROSSING OVER- DNDNNFNCBXJXBDJBXJX WHY DO YOU HAVE SUCH HARD QUESTIONS-

Answer:

A is the answer because she have to answer again to make sure it is right

Answer:

The main ingredient of cells is water. Water is needed to maintain homeostasis. Cells are also made up of macromolecules—nucleic acids, lipids, proteins, carbohydrates. These macromolecules help maintain a cell's structure, help cells communicate with each other, aid in energy storage, etc.

Answer:

Water

Explanation:

Answer:

Ok but what exaclty is the question?

Explanation:

Answer:

welp...

Explanation:

im pretty sure its a :)

Answer:

ribose

Explanation:

Answer:

Ribose & deoxyribose sugars. Ribose is a single-ring pentose [5-Carbon] sugar.

Answer:

Certain plants contain compounds similar to ecdysone which serve as a defense against insects. False

Juvenile hormone levels are high in insect larvae, but must decrease in order for metamorphosis to occur. True.

Chemicals similar to ecdysone and juvenile hormone are widely used commercially to control insect pests. True

Explanation:

The plants produce toxic chemicals such as terpenoids, alkaloids, anthocyanins, phenols, and quinones as a defense against insects. Juvenile hormone levels are high in insect larvae but its concentration decrease when the insect transform into adult stage and in order to  occur metamorphosis. Ecdysone and juvenile hormone are widely used as insecticide because it prevents the insects to transform from larva to adult so if they can't mature they can't harm the plants or other things of our environment.

Answer:

B

Explanation:

i am sorry if this is wrong

The following pieces of evidence does not mid-ocean ridges are formed Mid-ocean ridges are found on the bottom of most oceans.

The central parts of the oceans have mid-ocean ridges. The mid-ocean ridges are volcanic underwater mountain ranges.

There is constant propelling of magma, and as the magma cools off quickly it creates new crust.

This results in the mid-ocean ridges gaining heights of up to 1.5 km above the surrounding area.

So, option B is correct.

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Answer:

B

Explanation:

1) b

2) c

3) d

4) c

5) b

6) a

7) b

8) a

9) a

10)c

Answer:

1. b 2.c 3.d 4.c 5.b 6.a 7.b 8.c 9.a 10.c

Explanation:

not the most certain on 9 and 10 sorrym

Answer:

50 %

Explanation:

Answer:

An ion with a -2 charge, atomic number 17, an atomic mass of 25 has how many electrons?

Explanation:

Answer:

GO GET BOY

Explanation:

Answer:

if black feathers are the recessive gene than there is a 0% of black feathers and if its dominate than there is a 100% chance of black feathers

Explanation:

     b     b

w   bw  bw

w   bw  bw

Answer:

central united states

Explanation:

mainly in this area because of cold air coming in from canada and warmer air coming from the gulf of mexico meeting and causing tornados.

Answer:

A majority of tornadoes that occur in the United States, occur in the  Midwest and Southeast region of the United States.

Explanation:

Tornadoes can impact just about every U.S. state, but the majority of these storms are concentrated in states throughout the Midwest and Southeast. In fact, of the average 1,137 tornadoes that occur in the United States each year, 64% of them form in states located in “Tornado Alley” and “Dixie Alley”, two regions with a disproportionately high frequency of tornadoes due to atmospheric conditions that persist for long stretches of the year.

With an average of 140 tornadoes annually, Texas is the most tornado-prone state in the U.S., followed by Kansas with 80 and Florida with 59, according to National Oceanic and Atmospheric Administration data.

Top five states with the most tornadoes

Texas - 140

Kansas - 80

Florida - 59

Oklahoma - 56

Nebraska - 54

Bottom five states with the least tornadoes

Alaska - 0

Hawaii - 0

Rhode Island - 0

Delaware - 1

Idaho - 1

Answer:

seasonal climate change

Explanation:

based on the climate can vary whether or not the animal can adpat to live in that ecosystem. take polar bears for example. scientists say that polar bears won't be able to adapt to climate change bc it's changing so quickly.

hope this helps! have a fantastic day/night

An example of an event that can compromise an ecosystem is seasonal climate change.

An ecosystem is a place where all animals and plants, biotic and abiotic factors live together interdependent to each other.

There are different types of ecosystem:

Thus, the correct option is 1. Seasonal climate change.

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Answer:

There are other elements that are fundamental to life.

Explanation:

Carbon is fundamental to life although water is also important to life. You could argue that all life would be made mostly of carbon if you remove all the water though.

Answer:

dark colored forest with dark bark

Explanation:

since the population has gone down it shows the moths cannot blend in with their environment

Answer:

classifying

Explanation:

for example like classifying the files from SVU classifying them keeps them more organized and labeled kind of like identifying them classifying them keeps them all together in one group

Answer:

C.

Measure the volume of a balloon filled with room temperature air; place the balloon in a freezer for an hour and measure its volume again.

Hope this helps!

Measure the volume of a balloon filled with room temperature air; place the balloon in a freezer for an hour and measure its volume again would best investigate the effect temperature has on the volume of a gas. So, the correct option is C.

The ideal gas law states that the temperature of a gas is directly proportional to its volume. Specifically, the temperature of a gas will increase if its volume is decreased while its volume and pressure remain unchanged. If the volume of a gas is increased, its temperature will fall but its volume and pressure will remain unchanged.

This relationship can be explained by the fact that when a gas is compressed (that is, its volume decreases), the molecules are confined to a smaller area and move more away from each other and the walls of the container. Bars collide. Due to the increasing frequency of impacts, there is also an increase in kinetic energy, which increases the temperature.

So, the correct option is C.

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Answer:

a. savoury...........

Option A) savoriness, brothy, meaty

Complete question:

The offspring produced between two given types of plants can be any of the three genotypes, denoted by A, B and C. A theoretical model of gene inheritance suggests that the offspring of types A, B and C should be in a 1:2:1 ratio (meaning 25% A, 50% B, and 25% C). For experimental verification, 100 plants are bred by crossing the two given types. Their genetic classifications are recorded in the table below.

Genotype       Observed frequency

    A             →        18 individuals

    B             →        55 individuals

    C             →        27 individuals

Do these contradict the genetic model?  

Use a 0.05 level of significance.

Determine the chi-square test statistic.

Answer:

Do these contradict the genetic model? No, according to the chi-square test, there is not enough evidence to reject the null hypothesis of the population being in equilibrium.  

Explanation:

Available data:

So, let us first state the hypothesis:

Now, let us calculate the number of expected individuals, according to their expected ratio.

4 -------------- 100% -------------100 individuals

1 ---------------  25% -------------X = 25 individuals A

2 --------------  50% -------------X = 50 individuals B

1----------------- 25%--------------X = 25 individuals C

                                                  A                             B                           C

(Obs-Exp)²/Exp

A)  (18 - 25)²/25 = 49/25 = 1.96

B)  (55 - 50)² / 50 = 25/50 = 0.5

C)  (27 - 25)²/25 = 4/25 = 0.16

Chi square = X² = Σ(Obs-Exp)²/Exp  

X² = ∑ ((O-E)²/E) = 1.96 + 0.5 + 0.16 = 2.62

Freedom degrees = 2

Significance level, 5% = 0.05  

Table value/Critical value = 5.99

X² < Critical value

2.62 < 5.99    

These results suggest that there is not enough evidence to reject the null hypothesis. We can assume that the locus under study in this population is in equilibrium H-W.  

Answer: 12 sexual reproduction and meiosis concept outline

Explanation: The process of meiosis produces unique reproductive cells called gametes, which have half the number of chromosomes as the parent cell. Fertilization, the fusion of haploid gametes from two individuals, restores the diploid condition. Thus, sexually-reproducing organisms alternate between haploid and diploid stages.

Hope this helps :D