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Goryan [66]
3 years ago
5

The length of a DNA double helix increases by 0.34 nm (nanometres) for every pair of nucleotides. The total number of nucleotide

s in a human body cell is
1.2 \times {10}^{10}
Calculate the total length of a double helix in a human body cell (answer to be given in meters)​
Biology
1 answer:
taurus [48]3 years ago
6 0

Answer:

If you multiple 1.02 × 2 = 2.04 meter, it is the total length of DNA in human diploid cells.

Explanation:

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22. A plant geneticist is investigating the inheritance of genes for bitter taste (Su) and explosive rind (e) in watermelon (Cit
mylen [45]

Answer:

See the answer below

Explanation:

Using the formula for calculating Chi square (X^2):

X^2  =  \frac{(O - E)^2}{E} where O = observed frequency and E = expected frequency.

The observed frequencies for the four phenotypes are 88, 62, 62, and 81 respectively.

For the expected frequency, the phenotypes are supposed to assort in 9:3:3:1 according to Mendel ratio.

Hence, expected frequencies are calculated as:

phenotype (1) = 9/16 x 293 = 164.81

phenotype (2) = 3/16 x 293 = 54.94

phenotype (3) = 3/16 x 293 = 54.94

phenotype (4) = 1/16 x 293 = 18.31

The X^2 is calculated thus:

Phenotype            O               E                             X^2

  1                          88            164.81            \frac{(88 - 164.81)^2}{164.81} = 35.80

  2                          62             54.94            \frac{(62 - 54.94)^2}{54.94} = 0.91

  3                           62             54.94              \frac{(62 - 54.94)^2}{54.94} = 0.91

  4                            81              18.31               \frac{(81 - 18.31)^2}{18.31} = 214.64

Total X^2 = 35.80 + 0.91 + 0.91 + 214.64 = 252.26

To the nearest tenth = 252

Degree of freedom = n - 1 = 4- 1 = 3

X^2 tabulated  = 7.815

<em>The calculated </em>X^2<em> exceeds the critical value, hence, the null hypothesis is rejected. The two genes did not assort independently.        </em>

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3 years ago
If a plant is considered “drought-resistant“ does it require more or less water to perform photosynthesis?
leonid [27]

Answer:

Less water.

Explanation:

If the plant is "drought-resistant" then that should mean less water is required for the plant to perform photosynthesis.

6 0
3 years ago
What is the endocrine system responsible for in the body
OLEGan [10]
The endocrine system is a collection of glands that regulate your metabolism, growth, sleep, mood and other things around your body.
4 0
3 years ago
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What supplies energy for the water cycle?
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Answer:

The sun!

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The chemical energy of these plants all started with what energy source?
Zielflug [23.3K]

Answer:

Sun(solar energy)

Explanation:

The sun is the ultimate source of energy in our solar system.

The chemical energy in plants all started out with solar energy from the sun.

During the process of photosynthesis;

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Photosynthetic reaction simply converts solar energy from the sun into chemical energy.

Almost all animals obtain their own energy needs from the plants converting the chemical energy into other forms of energy.

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3 years ago
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