What does it mean for an allele to be dominant?

it will always be more common in a population

its better than recessive alleles

its phenotype will always be expressed in a heterozygous genotype

its phenotype will never be expressed in a heterozygous genotype

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Neelaredoxin is a 15-kda protein that is a gene product common in anaerobic prokaryotes. it has superoxide-scavenging activity, and it is constitutively expressed. in addition, its expression is not further induced during its exposure to o2 or h2o2 (silva, g., et al. 2001. j. bacteriol. 183: 4413–4420). which of the following statements best describes neelaredoxin synthesis? a-neelaredoxin is produced at all times; levels are constant even when exposed to o2 or h2o2.b-neelaredoxin is produced at all times; exposure to o2 or h2o2 increases expression.c-neelaredoxin is produced at all times; exposure to o2 or h2o2 decreases or prevents expression.d-neelaredoxin is only produced when there is exposure to o2 or h2o2.

Greenthe fossil record is the history of life recorded byhuman observationgod.climatologists.remains of the past.