Biology Answers

Explain some good microbiological practices

Are multiple chromosomes prokaryotic or eukaryotic

In chickens, a condition referred to as “creeper” exists whereby the bird has very short legs and wings, and appears to be creeping when it walks. If creepers are bred to normal chickens, one-half of the offspring are normal and one-half are creepers. Creepers never breed true. If bred together, they yield two-thirds creepers and one-third normal. Propose an explanation for the inheritance of this condition.

Three gene pairs located on separate autosomes determine flower color and shape as well as plant height. The first pair exhibits incomplete dominance, where the color can be red, pink, (the heterozygote), or white. The second pair leads to personate (dominant) or peloric (recessive) flower shape, while the third gene pair produces either the dominant tall trait or the recessive dwarf trait. Homozygous plants that are red, personate, and tall are crossed to those that are white, peloric, and dwarf. Determine the F1 genotype(s) and phenotype(s). If the F1 plants are interbred, what proportion of the offspring will exhibit the same phenotype as the F1 plants?

Explain monohybrid and dihybrid crosses including co-dominance, sex linkage and inherited genetic conditions

Which of the following anthropogenic activities directly contribute to freshwater salinisation in Australia’s inland rivers?

A.       Water abstraction for industry and the cycling of oceanic salt.

B.       Treated wastewater release and groundwater intrusion.

C.       Water abstraction for agriculture and wastewater release.

D.       Dryland salinity.

E.       Poor land management and the weathering of marine derived geology.

21.      Which of the following has been a key driver in the evolution of Australia’s unique biodiversity?

A.       Australia’s prolonged continental separation from Gondwana and the following geographic isolation to other continents

B.       Australia’s expanses of rich and fertile soils, reaching from coasts to the deserts

C.       Australia’s close geographic proximity to the tropical Indian sub-continent

D.       Australia’s wide, sandy coastal regions that follow the entire perimeter of the country

E.       Australia’s steep altitudinal gradient from Mt Kosciuszko to the coastlines