Answer:
The Y chromosome do not go through crossover
Explanation:
Typically, genes from the mother and father are shuffled -- or, "cross over" -- to produce a genetic combination unique to each offspring. But the Y chromosome does not undergo crossing over, and, as a result, its genes tend to degenerate, while repetitive DNA sequences accumulate. Each chromosome is made up of DNA.
Answer:
biological species concept
Explanation:
The biological species concept is the most commonly used and acceptable definition of species, which explains that a group of organisms can be referred to a species if members of the group can interbreed successfully to produce viable offspring that are also fertile. It explains that there tend to be reproduction barriers that would prevent different species of organism from successfully interbreeding. Also, that two organisms have the same appearance, do not necessarily mean they belong to the same species. For example, a horse and a donkey were interbreed to produce an offspring called the mule, but, the mule was found to be infertile. A horse and a donkey are different species, even though they have close appearance.
Answer:
the sun shines on earth, which through photosynthesis in a humble blade of grass turns into food and energy for the grass. now a small mouse hops along, stomach growling. it eats our blade of grass now itself getting energy. the naive, full mouse hops through the field before it squeaks in horror. a snake slinks towards it. the mouse is too slow. and the mouse breathes his last breath. the snake swallows it whole. stomach content now digesting its new energy sleeps. before it has the chance to react a hawk snatches it up in her claws. killing it she eats. this snake is poisonous, the next time our hawk flies, she stumbles, then falls. vanquished by poison her lifeless body lies in the dirt. her nutrients go into the soil, thanks to decomposers like worms. her nutrients help new grass blades grow, and the cycle continues.
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They loosen up to be tighten again
Answer: Wind-blown sand grains striking any solid object in their path can abrade the surface. Rocks are smoothed down, and the wind sorts sand into uniform deposits. The grains end up as level sheets of sand or are piled high in billowing sand dunes.
Explanation:
