Which of the following statements is false? the number of chromosomes is different in different organisms. there are more genes in a cell than there are chromosomes. a single gene can only influence a single trait. the karyotypes for a male human and a female human look different.

The false statement is "A single gene can only influence a single trait".

Explanation:

Pleiotropy is the ability of a gene to influence or regulate more than one character or trait. A single gene can easily control or affect one or more than one character in an individual.  

One gene-one enzyme hypothesis, in contrast, states that one gene only affects or influences only one metabolic process at a time. But it is proven that one gene can affect more than one trait.

Thus, the correct answer is "A single gene can only influence a single trait".

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