In mendel's experiment why did wrinkled seeds show up in the f2 generation even though they were not present in the f1 generation. a. the f1 generation was homozygous b. the f2 generation was homozygous c. the f1 generation carry recessive alleles d. the f2 generation carry only dominant alleles

The correct answer is option C,  the F1 generation carry recessive alleles

Explanation:

As per Mendel’s model, each trait is expressed by an allele. In his experiment round peas were denoted by “R” while the wrinkled peas were denote by “W”

If a characteristics (wrinkled) that was not expressed in the F1 generation, suddenly occurs in the next generation then there is only one possibility  and that is the non expression of recessive allele in the current generation. A recessive allele though it is present in previous generation remains non expressive in the presence of a dominant allele. However, In the next generation when two recessive genes (WW)  somehow come together , expresses the recessive trait.  

humans can cause extinction of a species through overharvesting, pollution, habitat destruction, introduction of invasive species (such as new predators and food competitors), overhunting, and other influences. explosive, unsustainable human population growth is an essential cause of the extinction crisis.

explanation:

i didn't have the answer choices , but i tried my best.