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kompoz [17]
3 years ago
14

Magma sometimes approaches or escapes onto earths surface, where does this magma form ?

Biology
1 answer:
drek231 [11]3 years ago
5 0

chambers od liquid lave are inside chamber deep in the earths crust

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The mitotic spindles arise from which cell structure?
Lapatulllka [165]

Answer:

The correct option is : b. centrosome

Explanation:

Centrosome is a cell organelle, which acts as the microbule organizing center and also regulates the cell cycle progression in an eukaryotic cell.

During the prophase stage of the cell cycle, the centrosomes are associated with the membrane of the nucleus. The nuclear membrane ruptures during the mitosis and the interaction of the centrosome nucleated microtubules with the chromosomes leads to the formation of the mitotic spindle.

<u>Therefore, mitotic spindles arise from the centrosome.</u>

5 0
3 years ago
Consider two different traits in mice affecting tail length and fur color. A two-factor cross was made involving true-breeding m
Stells [14]

Answer:

See the answer below

Explanation:

Null hypothesis: The two genes are independently assorting and therefore, are not linked to each other.

Let A represents the allele for tail length and B for fur color. Long-tail A is dominant over short tail a while brown fur B is dominant over white fur b.

For the first cross involving true-breeding mice:

    AABB   x   aabb

F1         AaBb (long tails and brown fur)

For the second cross:

      AaBb   x   aabb

4 AaBb - Long-tail, brown fur

4 Aabb - Long tail, white fur

4 aaBb - short tail, brown fur

4 aabb - short tail, white fur

Since the phenotypic ratio from the cross is 1:1:1:1, if the null hypothesis was to be true, it means that the expected phenotype ratio should be 1:1:1:1.

In order to test this hypothesis, we use Chi-square:

phenotype                           O            E                 X^2  

Long-tail, brown fur           118          97.5        \frac{(118-97.5)^2}{97.5} = 4.31

Long tail, white fur              77           97.5             4.31

short tail, brown fur             81           97.5              2.79

short tail, white fur              114           97.5              2.79

Total                                                                          14.2

Degree of freedom = 4 - 1 = 3

Critical Chi-square value = 7.815

The calculated Chi-square value is more than the critical value, hence, the null hypothesis is rejected.

8 0
3 years ago
What type offspring can be expected from a cross between a short plant and heterozygous plant?
Shkiper50 [21]

Answer:

25% tall, 75% short

Explanation:

6 0
3 years ago
Please Help (:
Usimov [2.4K]
Mitosis is a four-stage process that creates two identical cells from one original cell. In Mitosis chromosome the cell divides intotwo identical sets daughter nuclei. in mitosis the mother cell divides into two daughter cells which are genetically identical toeach other and to the parent cell.Meiosis is a reduction cell division where the number of chromosomes is divided into half. In Meiosis it gametes formationsoccur in animal cell and meiosis is necessary for sexual reproduction. The meiosis has 6 phase: Meiosis I, Prophase I ,Metaphase<span>I, Anaphase I, Telophase I, Meiosis II</span>
7 0
3 years ago
How does the term “selectively permeable” apply to a membrane?
Vladimir79 [104]

Answer:

Explanation:Selectively permeable means a membrane allows the passage of some molecules or ions and inhibits the passage of others. The capacity to filter molecular transport in this manner is called selective permeability

6 0
2 years ago
Read 2 more answers
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