Find the difference between 4.00_0.13

Suppose you have monohybrid pea plants in your garden and find that they produce round seed to wrinkled seeds in the ratio of 3: 1. if the allele are designated (r & r) receptively. what is the probable genotypes of the round seeds which produced f 1 ? rr & rr rr only rr & rr rr only rr only

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Give an example of a trait that is controlled by more than one gene.