Which option is the best example of a direct observation

Describe two ways evolution of organisms can have harmful effect on humans

Tanzania [10]

It can cause bacteria in bacteria can cause diseases

5 0

3 years ago

Amoebas are unicellular organisms, while human beings are multi-cellular and the most intelligent of organisms. However, both ar

snow_tiger [21]

That is because being prokaryotic or eukaryotic doesn't depend on the size of the organism, but rather on the cellular structure. Both are eukaryotic because they have clearly defined nuclei and functioning organelles that are differentiated, unlike prokaryotic organisms.

8 0

2 years ago

An individual heterozygous for eye color, skin color, and number of eyes mates with an individual who is homozygous recessive fo

sukhopar [10]

Answer:

B) 1 black eyes, green skin, two eyes : 1 black eyes, green skin, one eye : 1 black eyes, white skin, two eyes : 1 orange eyes, green skin, two eyes : 1 orange eyes, white skin, two eyes : 1 orange eyes, white skin, one eye

Explanation:

Parentals: BbGgCc x bbggcc

The punette square diagram of the cross of these two parents is attached.

B = black eyes, b = orange eyes;

G = green skin, g = white skin;

C = two eyes, c = one eye

Progeny with BbGgCc genotype → black eyes, green skin, two eyes = 8

Progeny with BbGgcc genotype → black eyes, green skin, one eye = 8

Progeny with BbggCc genotype → black eyes, white skin, two eyes = 8

Progeny with bbGgCc genotype → orange eyes, green skin, two eyes = 8

Progeny with Bbggcc genotype → black eyes, white skin, one eye = 8

Progeny with bbGgcc genotype → orange eyes, green skin, one eye = 8

Progeny with bbggCc genotype → orange eyes, white skin, two eyes = 8

Progeny with bbggcc genotype → orange eyes, white skin, one eye = 8

So, if we will see them in the form of ratio then each of the genotype will be in the ratio of 1 i.e. black eyes, green skin, two eyes: black eyes, green skin, one eye: black eyes, white skin, two eyes: orange eyes, green skin, two eyes: black eyes, white skin, one eye: orange eyes, green skin, one eye: orange eyes, white skin, two eyes : orange eyes, white skin, one eye = 1:1:1:1:1:1:1:1.

So, in view of above option B is most appropriate.

Note: In a trihybrid cross, a total of 64 progeny types may be produced.

6 0

2 years ago

5. There are many cases of human disease in which one or another enzyme activity is lacking due to genetic mutation. However, ca

Y_Kistochka [10]

Answer:

The citric acid cycle is fundamental to produce the energy needed for aerobic cell metabolism, thereby mutations in the enzymes involved in this metabolic pathway would be lethal to the individual

Explanation:

In aerobic organisms, the citric acid cycle (also known as the Krebs cycle), is a key metabolic pathway used to remove electrons and uses them in the electron transport chain in order to generate adenosine triphosphate (ATP), the energy currency of the cell. The citric acid cycle depends on eight enzymes that oxidize acetyl-CoA into two molecules each of carbon dioxide (CO2) and water (H2O). Thus, the citric acid cycle is a series of chemical reactions that are key to breakdown carbohydrates, fats and proteins into CO2 and H2O in order to produce energy (ATP).

7 0

2 years ago

We can accurately determine the age of a rock or fossil by measuring its

Inga [223]

Answer:

the amount of carbon-13 it contains

Explanation:

carbon dating has been used many historians, scientists and researchers in order to correctly estimate the amount of carbon it contains. This is because all substances contai carbon and the levels of carbon decrease/deteriorate over time

8 0

2 years ago