The human chromosome apparently lacking in gene influence is the: y chromosome x chromosome chromosome 21

Chromosome is part of a cell that carries hereditary material inform of genes, it contains DNA molecules tightly packed around histone proteins. X and Y are the sex chromosomes which influences the sex of an individual. Chromosome 21 is the smallest autosome in the human genome and exists in two pairs one inherited from either parent. In this case, the answer is the Y chromosome; sex is determined by the SRY gene which is responsible of the fetus to male. Other genes on the Y chromosome  are important for male fertility.

The return of the wolf to yellowstone national park will probably affect the bird population to some degree, not significantly. while wolves will hunt birds when necessary, they prefer to hunt larger prey. the bird population will most likely only be affected when hunting is scarce for the wolves. birds of prey will also probably not be affected as much as other birds who spend more time on the ground hunting for food as the tend to spend more time in the air or in trees since they do not need to stay on the ground for long due to the nature of the way they hunt.