Biology Questions
Explore questions in the Biology category that you can ask Spark.E!
Linneaus introduced a system for grouping species in _____(increasingly/decreasingly) inclusive catrgories
1. What are the three main mechanisms that can cause changes in allele frequency?
If 81% of a population is homozygous recessive for a given trait, what is the predicted frequency for those who are homozygous dominant?
Suppose 64% of a remote mountain village can taste phenylthiocarbamide (PTC) and must therefore have at least one copy of the dominant PTC taster allele. If this population conforms to Hardy-Weinberg expectations for this gene, what percentage of the population must be heterozygous for this trait?
Features that increase the likelihood of survival and reproduction by an organism in a particular environment are called
Suppose you have a population of flour beetles with 1,000 individuals. Normally the beetles are red; however, this population is polymorphic for a mutant autosomal body color, black, designated by b/b. Red is dominant to black, so B/B and B/b genotypes are red. Assume the population is in Hardy-Weinberg equilibrium, with equal frequencies of the two alleles.
Suppose that females of a species of beetles prefer to mate with males that have relatively rare color patterns. This observation would be an illustration of
1. What is the only mechanism that is adaptive, or improves the match between organisms and their environment?
Which of the following phrases is not an essential part of the biological species concept?A. morphologically distinctB. reproductive isolationC. independent evolutionary unitD. potential interbreedingE. no gene flow with other species
Which of the following sets of allele frequencies would produce the greatest proportion of heterozygotes?A. p = 0.9 q = 0.1B. p = 0.7 q = 0.3C. p = 0.5 q = 0.5D. p = 0.2 q = 0.8E. p = 0.05 q = 0.95
The presence of the disease sickle cell anemia illustrates that natural selection does not always eliminate ____ alleles.
The genetic contribution of an individual to succeeding generations, compared with that of other individuals in the population, is known as
Based on the lecture up to this point, the ultimate origin of genetic variation is
If a population with two alleles is at Hardy-Weinberg equilibrium and the frequency of one allele is 0.7, what is the heterozygote frequency?
The wings of birds and butterflies are examples of structures that resemble each other and have similar function but are the result of convergent evolution in separate lineages. These structures are called
Similar habitats often place similar selection pressures on different species. This often leads to unrelated species having features in common. What is this an example of?
Coloration in the peppered moth (Biston betularia) is determined by a single gene with two alleles showing complete dominance. Dark moths are homozygous dominant or heterozygous for the gene, light moths are homozygous recessive. In a sample of 100 moths, you determine that 64 of the moths are dark. According to the Hardy-Weinberg rule, the expected frequency of the dominant allele is ____.
In a population at Hardy-Weinberg equilibrium, the frequency of the a allele (recessive) is 0.60. What is the frequency of individuals heterozygous for the gene?
Both ancestral birds and ancestral mammals shared a common ancestor that was terrestrial. Today, penguins (which are birds) and seals (which are mammals) have forelimbs adapted for swimming. What term best describes the relationship of the bones in the forelimbs of penguins and seals, and what term best describes the flippers of penguins and seals?
Which of the following best describes natural selection?A) Chance variations in traitsB) The differential survival and reproduction of individualsC) The processes that lead individuals to resemble their parentsD) The potential for all species to increase rapidly in numberE) The immutability of species