Answer:
In the first step of meiosis I, the chromosomes/genetic material of the cell condenses into a visible form, into a form called heterochromatin. The nucleolus also disappears.
In the second step, a process called synapsis occurs. This is when homologous chromosomes align themselves, gene by gene.
In the third step, crossing over occurs. Segments of corresponding DNA are cut and exchanged between non-sister chromatids of the formed tetrads.
In the fourth step, the nucleus fragments, the nuclear envelope fragments, the two centrosomes (if we're talking about an animal cell) separate from each other as their asters and mitotic spindles (mostly microtubules (kinetochore and non-kinetochore) lengthen. The microtubules extending from the centrosomes can now connect to chromosomes.
Hi lovely! Here are your scientific questions that are testable:
Does the type of liquid affect how fast an ice cube melts?
Does changing the temperature of water affect the buoyancy of an egg?
Does the thickness of the wire affect the power of the circuit?
Hope I helped!
I guess the answer is B !! as it has no relevance and is not an observation !!
Answer:
i would go with b
Explanation:
Both are based on variation, heredity and selection, but how these appear and work differ. Biological evolution is unconscious, opportunistic and not goal-directed, while cultural evolution is conscious, at best planned, and can have a goal.
