Explanation:
The phase of Prophase I of meiosis is very long and divided into 5 subphases: Leptotene, Zygote, Pachytene, Diplotene, and Diakinesis. During a phase of the Diplotene, the degree of condensation is high, which allows individualizing the sister- chromatids that remain attached by the cohesins. The synaptonemal complex disintegrates, and from the centromeres begins a repulsion between homologous chromosomes, which remain associated only with the places where they occur as permutations.
These sites are called chiasmas (Greek, crossed) because they show the crossover of homologous chromatids. Chiasmas represent the cytological finding of the occurrence of permutation. The presence of at least one bivalent chiasm is essential to ensure the correct segregation of the homologous chromosomes in anaphase I.
Answer:
Traditionally, these fauna have come to represent an important development in the evolution of life on Earth, because they immediately predate the explosion of life-forms at the beginning of the Cambrian Period 541 million years ago.
Explanation:
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Answer:
the Stratum Corneum
Explanation:
Definition most superficial layer; composed of 25-30 layers of flattened, dead keratinocytes constantly being shed and replaced
Cutting down trees, building roads in mountains, constructing buildings and removing sediments from sidewalks using water does donate to increase the turbidity of water.
<h3><u>Explanation:</u></h3>
Turbidity of water is formed due to a suspension formation of water and the dust and dirt along with several insoluble particles. This turbidity is actually formed in nature due to erosion by water or wind which gets deposited in water. Removing trees or construction of road leads to loosening of ground soil which is easily washed away by water. Construction of buildings also results in cutting of trees. The washing of sediments with water also increases the chance of turbidity of water.
