Answer:
g. A cell model consisting of a circle containing four vertical pairs of lines attached at the middle, stacked in two rows of two.
Explanation:
In Metaphase I of the cells, homologous chromosome pairs are lined up next to each other which is defined as synapsis. Each pair of two chromosomes (bivalents) consists of four chromatids in total are positioned on the metaphase plate.
Metaphase I occurs when tetrads of chromosomes are lined up along the equator of the spindle. Spindle fibres are attached to the centromere region of each homologous chromosome pair. These homologous chromosomes consist of the matching alleles originating from mother and father.
In Metaphase I, meiotic recombination (''crossing over'') happens. Meiotic recombination means there is a genetic shuffling of the attributes of both parents. A result is a large number of possible genetic combinations. It is estimated that there is a 50-50 chance for the daughter cells to receive or mother's or father's homologous for each chromosome. In an organism with 2 sets of chromosomes, there are 4 ways in which the chromosomes may be arranged. This is resulting in differences in the chromosomal distribution in daughter cells after meiosis I.
Answer:
They are similar in that both involve the growth of new organisms in an environment. However they differ in that primary succession occurs in a place where no life had been before, while secondary succession occurs in place where life had been before, but was destroyed.
Some examples of primary succession include the formation of a new ecosystem after a volcano, glacier outbursts, or a nuclear explosion. Some examples of secondary succession include succession after fire, harvesting, logging, or abandonment of land or the renewal after a disease outbreak.
Diatoms are made of silica (hydrated silicon dioxide)
Answer:
Could probably find it in Google.