The randomness in the alignment of recombined chromosomes at the metaphase plate, coupled with the crossing over events between nonsister chromatids, are responsible for much of the genetic variation in the offspring. To clarify this further, remember that the homologous chromosomes of a sexually reproducing organism are originally inherited as two separate sets, one from each parent. Using humans as an example, one set of 23 chromosomes is present in the egg donated by the mother. The father provides the other set of 23 chromosomes in the sperm that fertilizes the egg. Every cell of the multicellular offspring has copies of the original two sets of homologous chromosomes. In prophase I of meiosis, the homologous chromosomes form the tetrads. In metaphase I, these pairs line up at the midway point between the two poles of the cell to form the metaphase plate. Because there is an equal chance that a microtubule fiber will encounter a maternally or paternally inherited chromosome, the arrangement of the tetrads at the metaphase plate is random. Thus, any maternally inherited chromosome may face either pole. Likewise, any paternally inherited chromosome may also face either pole. The orientation of each tetrad is independent of the orientation of the other 22 tetrads.
Explanation:
C. The process shown above is known as translation and involved the production of proteins from RNA.
Answer:
C, the DNA in a Eukaryotic cell is in the nucleus
Answer:
1.623
Explanation:
There's a general rule about the movement of energy through the trophic levels. That rule says that every next trophic level gets 10% of the energy from the previous trophic level. If there are 1,623 calories in the first trophic levels, then the second trophic level will receive 162.3 calories. The next, third trophic level will receive 16.23 calories while the last fourth trophic level will receive 1.623 calories.
