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3 years ago

Write an example of how a density-independent factor can decrease a population of cherry trees

1 answer:

4 0

It can kill all the cherry trees because they will become suffocated by density and most will die
Hope this helped☺️☺️☺️

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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

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

4 0

2 years ago

Fungi have chlorophyll True or false?

Alika [10]

false

have a goed day

3 0

3 years ago

If Rochester were a cell, what would be the nucleus?

Natasha_Volkova [10]

Answer:

correct answer is A

Explanation:

nucleus is most important part of a cell as a town hall would be to a city

7 0

3 years ago

Read 2 more answers

Which of the cell types shown helps determine capillary permeability?

alexira [117]

The correct answer to this is:

“Astrocytes”

Astrocytes also called star cells due to their shape are the most abundant glial cells in the brain. Extensions from these cells encase capillaries and offer extra control over which materials enter or leave the intercellular fluid of the CNS thus acting like a permeability membrane.

6 0

3 years ago

After phosphates and nitrates have entered a water

frosja888 [35]

After phosphates and nitrates enter a water system, the steps of eutrophication include the rapid growth of algae, death of underwater plant species, depletion of oxygen in the water, and the death of fishes and invertebrates. The correct option would be B.

Eutrophication refers to the excessive enrichment of water bodies by nutrients such as phosphates and nitrates thereby facilitating the rapid growth of some aquatic species with negative effects.

Once a water body becomes excessively enriched with phosphates and nitrates, the following is a sequence of events that follows:

Algal bloom: the nutrients facilitate the rapid growth of algae
The bloom of algal species results in the death of underwater plants as a result of inadequate light.
The death of the underwater plants and the accompanying microbial activities in decomposing them cause oxygen levels in the water to drop.
Reduction in oxygen level causes fishes and other water invertebrates to die due to hypoxia

Therefore, the correct steps of eutrophication according to the illustration is IV, II, I, and III.

More on eutrophication can be found here: brainly.com/question/13232104

6 0

3 years ago