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3 years ago

How long have scientists understood the role of DNA in heredity

Biology

1 answer:

exis [7]3 years ago

6 0

Answer:

The discovery of DNA occurred in 1869 by Swiss-born biochemist Fredrich Miescher, it took more than 80 years for its importance to be fully realized. The experiments reported in Oswald Avery and his colleagues' landmark paper of 1944 provided convincing proof that DNA was the hereditary material.

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Which statement describes the structure of lipids?

iren2701 [21]

Answer:

composed of a glycerol molecule binded to fatty acid molecules

Explanation:

6 0

3 years ago

In class, we discussed the analogy of a cell being like a night club. What is

Marysya12 [62]

Answer:

I would say lysosomes would be like the janitors, since lysosomes typically clean up waste within the cell

Explanation:

7 0

3 years ago

Red bone marrow only differs from yellow bone marrow because of a difference in the amount of which substance?

Levart [38]

Red bone marrow only differs from yellow bone marrow because of a difference in the amount of fat.

<h3>What is Bone marrow?</h3>

Bone marrow may be defined as an absorptive substance discovered in the middle of the bones. It synthesizes bone marrow stem cells and other substances which are responsible for producing blood cells.

The complete question is as follows:

the amount of antibody
the amount of cytokine
the amount of antigen
the amount of fat

Red marrow includes blood stem cells that can evolve into the different components of blood such as red blood cells, white blood cells, or platelets. While yellow marrow is constructed predominantly of fat.

Thus, it is well described above.

To learn more about Bone marrow, refer to the link:

brainly.com/question/14412520

#SPJ1

4 0

2 years ago

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>

4 0

3 years ago

Why do many plants have specialized cells that produce colorful flowers?

neonofarm [45]

To attract insect... just act of reproduction

8 0

3 years ago

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