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Crazy boy [7]
3 years ago
10

When the northern hemisphere is having summer solstice what is happening in the southern hemisphere

Biology
2 answers:
KonstantinChe [14]3 years ago
6 0

Answer:

C. Winter Solstice

hichkok12 [17]3 years ago
5 0
C. winter solstice because if the North is having summer, the south would be having the opposite due to the direction the earth is tilted in orbit
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Use the mechanisms of meiosis to explain why most mules are sterile.
Tema [17]

Answer:

3. An even number of chromosomes are required for synapsis during prophase I and proper pairing during metaphase

Explanation:

Mules are hybrids of a cross between a female horse and a male donkey. Horses contain 64 chromosomes while donkeys contain 63 chromosomes in their somatic cells respectively. This means that they each produce 32 and 31 chromosomes respectively during meiosis. A mule, hence, contains 32+31= 63 chromosomes in their somatic cells.

This chromosome number in mules are uneven for meiosis to occur because meiotic division requires that an even number of homologous chromosomes pair together in a process called SYNAPSIS during prophase I of meiosis I. This is impossible in a mule because of the uneven number of chromosomes in its cells.

Also, during metaphase of meiosis, the homologous chromosomes need to be properly aligned at the equator for separation to occur. This is also impossible in a mule considering the number of chromosomes that don't add up.

Due to this reason of unevenness in the number of chromosomes present in a mule, meiosis will not occur and if meiosis (gamete formation) does not occur, reproduction cannot take place. Therefore, the mule is a sterile species i.e. cannot produce offsprings via sexual reproduction.

4 0
2 years ago
Please help<br><br><br><br><br> I don't know which one is the answer :(​
natka813 [3]

Answer:

the one that you chose it the correct answer.

Explanation:

6 0
2 years ago
Read 2 more answers
A ruler has markings as shown below. Stefan uses this ruler to measure the length of a metal rod. How many decimal places should
vladimir1956 [14]
Based on a ruler in centimeters, with ten divisions between each centimer mark, you will have marks at every 0.1 cm.


Then, the measure of the length of a metal rod should have 1 decimal place.


That decimal place means mlimiters, given that 1 mm = 0.1 cm.


Answer: 1 decimal place



8 0
3 years ago
Read 2 more answers
Explain how animal cell structures and organelles interact as a system to maintain homeostasis.
RideAnS [48]
Animal cell structures and organelles interact as a system to maintain homeostasis by making sure each part of the system works together.
5 0
3 years ago
When the threshold of voltage-gated channels is reached and voltage-gated channels open, the resulting change in membrane potent
sveta [45]

Answer:

Action potential.

Explanation:

Action potential may be defined as the change of the membrane potential of the cell with response to the stimulus. The different ions enter and exit the cells.

Action potential generates in the cell when the threshold voltage - gated channel reaches and opens the voltage gate channel. The opening of voltage gated channel changes the membrane potential of the cell.

Thus, the correct answer is option (4).

5 0
3 years ago
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