Two carriers have a 25 percent chance of having an unaffected child with two normal genes (left), a 50 percent chance of having an unaffected child who also is a carrier (middle), and a 25 percent chance of having an affected child with two recessive genes (right).wo carriers have a 25 percent chance of having an unaffected child with two normal genes (left), a 50 percent chance of having an unaffected child who also is a carrier (middle), and a 25 percent chance of having an affected child with two recessive genes (right).
Top definition. flat. 1. The name given to an apartment which you rent weekly or monthly. 2. The name given to someone who is not cool and is dull and boring. 3. The name given to a woman with no or hardly any breasts. 4. Something which is level, does not decrease or increase.
A flat tax (short for flat tax rate) is a tax system with a constant marginal rate, usually applied to individual or corporate income. A true flat tax would be a proportional tax, but implementations are often progressive and sometimes regressive depending on deductions and exemptions in the tax base.