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.
(in musical notation) the character &flat;, which indicates that the pitch of a note is lowered by one half step. a tone that is one half step below another. an automobile tire that has lost the air. Idioms. Idioms fall flat, [no object] to fail completely and noticeably: an attempt at humor that fell flat. Idioms flat out, [Informal.] without hesitation;