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kirill115 [55]
3 years ago
8

Crossing over happens in what stage of meiosis exactly?

Biology
2 answers:
Nitella [24]3 years ago
5 0
There are several stages but the crossing over starts on the second stage. And the actual crossing sides happens on the following stage. Hope this helped :)
marshall27 [118]3 years ago
4 0

Answer:

In prophase stage, nearly to the metaphase.

Explanation:

Remember meiosis is the process in which the cell will divide and at the end will be 4 new cells with the half of genes each one. So at the begging of the process ( in the interphase) the cell will start to collect all the compounds, nutrients, etc. to duplicate its genetic information. The next stage ( the prophase), the cell will duplicate and recombine their genetic information ( that means cross over). In the next stage ( the metaphase), the four tetrads (the four similar genes that were duplicate), they start to align in the spindle fibers to start the first cell separation.  

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Scientists once believed that modern-day reptiles were the only living descendants of dinosaurs, which were reptiles. Accumulati
Mrrafil [7]

This is the complete question

Scientists once believed that modern-day reptiles were the only living descendants of dinosaurs, which were reptiles. Accumulating fossil evidence has now suggested that the most recent dinosaurs gave rise to birds, making birds one of the closest living relatives of dinosaurs.

What statement provides the strongest evidence to support the claim that birds evolved from dinosaurs?

A. A fossilized rib cage of the semi-aquatic dinosaur Spinosaurus shows that it had lungs.

B. Fossils of the beaked dinosaur Ankylosaurus show that it had modified scales that produced hard, bony plates.

(C. Fossils of the winged dinosaur Archaeopteryx show that it had modified scales that produced feathers.) c is the right answer

D. A fossilized nest of the herbivorous dinosaur Brachiosaurus shows that it laid external eggs.

The correct answer is option C, that is, fossils of the winged dinosaur Archaeopteryx show that it had modified scales that produced feathers.  

<h3>What is Archaeopteryx?</h3>

Archaeopteryx is considered an intermediate fossil between the dinosaurs and modern birds.

With its amalgamation of reptilian and avian characteristics, it was long considered as the earliest known bird. It was found in 1860 in Germany, it is sometimes also called Urvogel, that is, the German term for a first bird or original bird.  

Thus, The correct answer is option C.

To learn more about Archaeopteryx click here:

brainly.com/question/17059171

#SPJ1

5 0
2 years ago
How many nuclei will be left after the second half-life?
LiRa [457]

Answer:

4

Explanation:

8 0
3 years ago
A population of white rabbits and brown rabbits both live in a temperate deciduous forest where the summers are mild and average
Svetach [21]

Answer:

Q: ...what do you expect to happen to the population of each color of rabbit?

A: The white rabbit population may slowly die off while the brown rabbit population thrives and reproduces.

Explanation:

The white rabbits are well adapted to survival in cold winter months and snowfall, where they may camouflage effectively to avoid predation. However, the brown rabbits, more adapted to warmer periods in the fall, spring and summer in the temperate deciduous forest; the trees lose their leaves before cold seasons.

Leaf litter and foliage in warmer months likely provides better camouflage for brown rabbits. Camouflage is an adaptation to predation; the rabbits blend into surrounding colors, textures and patterns to avoid detection.  In the onset of shorter winters, the white rabbits will be unable to avoid predators without snow to blend into; they would contrast with their surroundings making them easy targets to be hunted. Thus, with extended periods of warm temperatures, brown rabbits are more likely to survive and reproduce leading to a thriving population.

8 0
3 years ago
Which type of environmental scientist is likely to study how different species of birds interact?
Marta_Voda [28]
D. Ecologist is the right answer



6 0
4 years ago
I WILL GIVE BRAINLIST ​
exis [7]

Answer:

A

Explanation:

The animal kingdom is divided into <u>31</u> Phyla and <u>101</u> Classes.

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3 years ago
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