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3 years ago

Why do some birds have bright colors while others look more camouflaged

1 answer:

7 0

Male Birds are usually the colorful birds to attract mates while females are camouflaged to protect their eggs/hatchlings. Ground birds need to be camouflaged because they are easy prey and they have their nests on the ground.

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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>

4 0

3 years ago

In which direction does carbon dioxide move during internal respiration?

Anit [1.1K]

Carbon dioxide moves out of the tissues (cells) into the bloodstream to be exhaled in internal respiration.

3 0

4 years ago

Does anyone know this answer????

skad [1K]

D can be eliminated because the temperatures where changed in 3 ways, not two.

A is true, but doesn't apply to the actual experiment "design"

B we don't know for sure, it just looks like a cup/glass.

Best answer for you: C

C is true- it was tested with a single independent variable (one that does not change) on multiple trials (the different temperatures)

8 0

3 years ago

What phase of the cell cycle comes before prophase stage of mitosis

77julia77 [94]

Hey.

Your anserw is interphase.

Mitosis has five different stages: interphase, prophase, metaphase, anaphase and telophase. The process of cell division is only complete after cytokinesis, which takes place during anaphase and telophase. Each stage of mitosis is necessary for cell replication and division.

7 0

4 years ago

>> why does temperature affect the rate of enzyme reactions?

Zielflug [23.3K]

Answer:

more molecules reaching the activation energy, which increases the rate of the reactions. Since the molecules are also moving faster, collisions between enzymes and substrates also increase.

Explanation:

5 0

3 years ago