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Firdavs [7]
3 years ago
14

Which correctly describes crossing over?

Biology
1 answer:
Reika [66]3 years ago
8 0

Answer:

Crossing over is the process whereby homologous chromosomes are pulled to opposite poles of the cell.

Explanation:

I hope this helps

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Exobiologists have discovered under the surface of Mars an alien species of single-celled organisms, which undergo sexual reprod
Llana [10]

Answer:

The dominant phenotypes are Long flagella and one vacuole, and the recessive phenotypes are small flagella and two vacuoles.

Explanation:

As you can see in the attached table

1. For the size of the flagella we gave that:

- 241 organisms have long flagella

- 79 organisms have short flagella,

As there are more organisms with long flagella we can conclude that this is the dominant phenotype while the short flagella is the recessive phenotype.

2. For the number of vacuole we have:

- 247 organisms have one vacuole

- 73 organisms have two vacuole

As there are more organisms with one vacuole we can conclude that this is the dominant phenotype while having two vacuoles a is the recessive phenotype.

Then

Dominant phenotypes = Long flagella and one vacuole

Recessive phenotypes = Short flagella and two vacuoles

5 0
3 years ago
What exercise requires that the knees always stay in line with the toes throughout the jumping phases of takeoff and landing?
Tasya [4]

Answer:

The correct answer is - power step-ups.

Explanation:

Power step up is an exercise that involves an individual to stand upright and lift ur chest and tuck chin in. Put one leg on box or step and forcefully push that leg into the air and put the leg softly on the box or step and again push this leg now in air forcefully and softly put another leg on the box, repeat this again and again.

This exercise helps to keep the knee in line with the toe through the jumping of landing and take off.

Thus, the correct answer is - power step-ups.

3 0
3 years ago
Which of the following is produced by mutation and is essential for evolution to occur
tatiyna
Diversity is produced by mutation, it is what causes life to have advantages or disadvantages, and thus allow survival of the fittest to choose which mutation is the best suited for it's environment.
7 0
3 years ago
SOMEONE PLZ HELP ME!!!!!!!
Genrish500 [490]

Answer:

nucleus  mitochondria ,

, lysosome i think

Explanation:

8 0
3 years ago
Read 2 more answers
Select the correct statement(s):
expeople1 [14]

Answer:

The correct option is B <em>Pressure-sensitive baroreceptors uses tonic receptors which adapt slowly to the stimulus</em>

Explanation:

a. The thalamus receives stimulus from all of the five senses (sight, smell, taste, hear, touch). FALSE. Olfactory information is not sent to the thalamus for its process. The rest is.  

b. Pressure-sensitive baroreceptors uses tonic receptors which adapt slowly to the stimulus. TRUE. Among the different types of tonic receptors, we may find baroreceptors, irritation receptors, tactile receptors, and proprioceptors. Tonic receptors characterize by their slow adaptation to the stimulus. The first discharge is maximal when the stimulus is received and then it progressively decreases. They send a continuous signal to the CNS.

c. The three layers that the retina is made of: photoreceptors, bipolar cells, rod cells. FALSE. There are in fact three layers in the retina: photoreceptors, bipolar cells, and ganglion cell layers. NOT rod cells.  

d. The sense of smell uses phasic receptors which continuously fire as long as the stimulus is present. FALSE. Olfactive sense uses phasic receptors, but not continuously. These receptors shoot when they receive the stimulus, and then cease if the stimulus keeps constant.

6 0
3 years ago
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