In a population, a specific gene has two alleles, 'A' and 'a.' Individuals with
genotype 'aa' die in early childhood. Individuals with genotype 'Aa' have a
higher rate of surviving and reproducing than individuals with genotype 'AA.'
This phenomenon is called

In a population, a specific gene has two alleles, 'A' and 'a.' Individuals with

genotype 'aa' die in early childhood. Individuals with genotype 'Aa' have a

higher rate of surviving and reproducing than individuals with genotype 'AA.'

This phenomenon is called survival of the fittest, Darwins law which entails the fittest organisms survives while the ones that could not would go into extinction

Explanation:

The phenomenon is called heterozygote advantage

Explanation: Heterozygote advantage is a phenomenon whereby a single copy of a recessive allele doesn't result in a disease in a heterozygous individual rather offers an advantage to the carrier (the heterozygous individual). For example, the sickle cell allele does not cause sickle cell disease in the carrier rather confers resistance to malaria in heterozygous individuals, but causes a deadly disease (sickle cell disease) in homozygous individuals.

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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.