Answer:
d.during only prophase I and involves exchange between chromatids of homologous chromosomes.
Explanation:
Crossing over is the event that occurs during the pachytene stage of prophase I of meiosis I and results in the formation of new gene combinations, that is, recombination. During pachytene of prophase I, the synapsed homologous chromosomes exchange the genetic segments between them.
To facilitate recombination, synaptonemal complex assists in pairing the homologous chromosomes together during the zygotene stage of prophase I. Zygotene is followed by pachytene. A cut in two non-sister chromatids of a homologous pair, exchange of the broken segments followed by ligation results in recombination. Prophase II does not include crossing over.
Plants and other multicellular organisms through the process of photosynthesis
Some bacteria breathe with oxygen, but others use forms of respiration. But, bacteria don't breathe in the same way humans do.
Answer:
Hypothesis
Explanation:
Since the problem of the research has been already defined, the next step is to formulate a hypothesis.
This is a clear statement highlighting the main idea or purpose of the scientific research. In this case our hypothesis could be:
The way in which information is presented affects student interest and memory of the material.
Answer: A
Explanation:
The three reactants used in photosynthesis are water (H2O) carbon dioxide (CO2), and light (sunlight energy). These reactants are used to produce glucose/food for plants and oxygen that is later released.
