If crossing over occurs between two chromatids on a single pair of homologous chromosomes, how many gametes will have a recombinant phenotype?

all 4
1 of the 4
2 of the 4
3 of the 4
none of them

If  crossing over occurs only between two chromatids, these crossover chromosomes produce the recombinant gametes and the remaining two are similar to the parentals.

The answer is a

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.