A weakness in Darwin's original theory of evolution was that

Explanation:

Inheritance of acquired characteristics is rare if it happens at all. Darwin said that it sometimes contributes to evolution. He was right by claiming that most of evolution is caused be random mutations.

2. Whales have evolved from hippo like creatures (even toed ungulates), not bear like creatures (carnivores). Darwin gave as a hypothetical example of evolution the evolution of bears into whales. He should have used hippos, but the steps were probably the same.

3. Darwin speculated that birds evolved from dinosaurs. However, he got the wrong dinosaurs.

4. Darwin SUGGESTED that full metamorphosis in insects emerged from alternate generation of sexual and asexual reproduction. Now, full metamorphosis seems more like an extenuated form of molting.

5. He interpreted recessive genes in pigeons as a form of ‘retrogressive variation’. This may be a matter of semantics since ‘retrogressive variation’ have no formal definition. Maybe what Mendel called a ‘recessive gene’ is what Darwin called a ‘retrogressive variation’.