Explain how traits that are not expressed in one generation can reappear in the next generation

Recessive traits can skip a generation because a dominant phenotype can by either homozygous or heterozygous genotypes. So 2 heterozygous people would have the dominant phenotype for a trait but since they each have a recessive allele, they both could pass a recessive allele to their offspring. This would be a Monohybrid cross.

Atissue is a group of connected cells that have a similar function within an organism.

Everything that you need in a lab is in your lab