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sammy [17]
3 years ago
5

in the early days of antibiotic use , penicillin and sulfonamide were used to successfully treat a variety of bacterial infectio

ns . in later years stronger antibiotics were needed because some bacteria were either resistant to or not affected by these same antibiotics . this situation is best explained ?
Biology
1 answer:
Vladimir [108]3 years ago
8 0
This situation is best explained by the process of natural selection.
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The picture shows the dihybrid cross of 2 guinea pigs.
Pepsi [2]

Corrected Question:

The picture shows the dihybrid cross of 2 guinea pigs.

1. What is the genotype of the parents?

2. What is the phenotype of the parents?

3. What is the genotype of their baby guinea pig (in the empty box)?

a. BbRr - black rough fur

b. Bbrr - black smooth fur

c. bbRr- white rough fur

d. bbrr - white smooth fur

Answer:

Genotype of parents is BbRr as seen in the cross.

Phenotype of the parents is black rough furred.

The genotype of the baby in the empty box is bbRR.

Option D

<h3><u>Explanation:</u></h3>

This representation of the genetic crossing is called as Punnet square, after the name of the scientist who discovered this process to denote the probability of finding the required genotype in a statistical way.

Here both the parents are heterozygous black and rough furred, with the genotype of BbRr.

So the gametes from the parents are = BR, Br, bR, and br from both the parents which are represented in the Punnet square.

Thus we can get 16 types of genetic combinations among the offsprings.

4 0
3 years ago
Is it possible for marine scientists to get an exact count of a population? Why or why not?
Nady [450]

No, that is completely impossible. The reasoning behind it is because if its a large group of fish they're swimming back and forth ect, ect, it would be like counting a bowl of rice, but not being able to take any out. To get around these counting problems, scientists take data from just a small portion of the population called a sample. They take several samples and then use the average size of those samples to calculate an estimate of the entire population size.


If you need help feel free to ask!

8 0
3 years ago
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The aerobic system of energy production uses glycogen, but primarily ______ as its energy source?
Dmitry_Shevchenko [17]


The aerobic system of energy production uses glycogen, but primarily glucose  as its energy source.

Glucose is taken in by the cell and broken into pyruvate in the process of glycolysis, the first step in aerobic cell respiration. It takes place in the cell cytoplasm.

Pyruvate is then used in the Krebs cycle in the cell mitochondria in the second step of respiration which produces high energy electron carriers. These high energy electron carries such as NADP are then employed in the electron transport chain, the last step of the respiration process, where a large number of ATP molecules is produced.

By the time the process of aerobic respiration ends, 36 to 38 molecules of ATP are produced from one single molecule of glucose.




4 0
3 years ago
What is the relationship between Joints, muscles, bones and nerves? plz hurry.
erastova [34]
Bones are the structure of the body, muscles allow the bones to move, nerves allow messages to be sent back and forth from the brain to the mucells telling them to move, joints join the bones of your body and allow them to move.
4 0
3 years ago
i’m taking a practice test that allows me to get my full grade up and don’t understand which one goes in which
sukhopar [10]

Answer:

is there a picture i can see so i can help

5 0
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