Homologous chromosomes pair up and exchange segments of DNA.
Option A
<h3><u>Explanation:</u></h3>
Crossing over is an event of Prophase 1 of meiosis 1. It occurs in the zygotene phase of prophase 1. Here the homologous chromosome pairs get very close together and gets packed within protein coat. The enzymes randomly cut the DNA segments from both chromosomes at same loci and exchange them with each other. This results in the exchange of genes between the two chromosomes. This is how the variation comes to place between offsprings of the same individuals. The crossing over results to form X shaped intersections between homologous pair of chromosomes which is called as chaismata. This phase occurs in pachytene phase and is visible in diplotene phase when the protein coat dissolves.
Answer:
Carbon dioxide is released when fossil fuel is burned in the atmosphere. The fossil fuels are made of hydrocarbon and once it is burned in air carbon dioxide is released into the environment.
Carbon dioxide is one of the most important gases present in the atmosphere which constitutes of about 95 per cent of the the whole atmospheric gases.
Carbon dioxide is one of the main green house gases that helps in the absorbing heat from the atmosphere. It makes the temperature suitable for the organism to live on earth.
Carbon dioxide is a waste product of cellular respiration which is released inside the body an is expelled into the outer atmosphere.
Answer:
Ocean currents act as conveyer belts of warm and cold water, sending heat toward the polar regions and helping tropical areas cool off, thus influencing both weather and climate.
Explanation:
So that is why.
It’s A ok cjcydufufxycucjfhxycifyfyy it dug my yogi
Answer:
C. Under the age of 20
Explanation:
Look at the graph and find what letter the male's bar is larger than the female's. You can see that it's letter B. Then, look at the legend and find what ages lay under letter B. It is C., under the age of 20.
Please mark me as Brainliest; I need it to move onto the next level! =)
