Cells are divided into two main classes, initially defined by whether they contain a nucleus. Prokaryotic cells (bacteria) lack a nuclear envelope; eukaryotic cells have a nucleus in which the genetic material is separated from the cytoplasm. Prokaryotic cells are generally smaller and simpler than eukaryotic cells; in addition to the absence of a nucleus, their genomes are less complex and they do not contain cytoplasmic organelles or a cytoskeleton (Table 1.1). In spite of these differences, the same basic molecular mechanisms govern the lives of both prokaryotes and eukaryotes, indicating that all present-day cells are descended from a single primordial ancestor.
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The wife and husband are heterozygous, therefore, they have one dominate allele and one recessive allele. The little boy inherited both recessive alleles so he can't roll his tongue.
T = Dominate allele
t = recessive allele
Wife : Tt
Husband: Tt
Boy: tt
When they live as a poor or rich have different feelings
