General Biology II

The nitrogenous base Adenine can pair with _____.

• Adenine

• Guanine

• Cytosine

• Thymine

A cross occurs between a black homozygous mouse and a white homozygous mouse. They produce gray offspring.

What type of dominance is reflected in the scenario above?

• Codominance

• Incomplete dominance

• Complete dominance

• Blending of Genes

During which era did the earliest dinosaurs appear?

• Cenozoic

• Paleozoic

• Mesozoic

• Precambrian

A cross occurs between a black homozygous mouse and a white homozygous mouse. They produce gray offspring.

What are the percentage probabilities for the genotype and phenotype of the offspring?

• 100% black; 100% Bb

• 100% black; 100% Bb

• 100% white; 75% Bb, 25% bb

• 100% gray; 100% Bb

A gene for corn has two alleles, one for yellow kernels and one for white kernels.

A farmer mates yellow and white corn. All of the offspring have a nearly even mix of yellow and white kernels.

Which type of inheritance most likely explains the relationship between the two alleles?

• Codominance

• Incomplete dominance

• Polygenic inheritance

• Pleiotropy

A group of individuals have lived for generations on an island. Their average height is 5 feet 2 inches. Eventually, ships stop by the islands bringing more fruits, vegetables and meats to their diet and more food overall. While the islanders continue to marry islanders and produce children, over generations the average height of the islander population reaches 5 feet 6 inches. What was most likely the main factor in this change?

 

• Changes and mutations in the genes within the island population of islanders.

• Changes in nutrition that affected the phenotype, fully expressing the genotype.

• An influx of new genes from the incoming human population.

• The effect of medications brought by the ships stopping at the island.

Pangaea broke up during the: 

• Paleozoic

• Mesozoic

• Cenozoic

• Precambrian

Mendel crossed two plants, called the P generation. The offspring of this cross are known as hybrids. What are hybrids?

• The result of crossing two true breeding plants; they contain two genes, one of each allele.

• The result of a hybrid cross; they contain two genes for each trait, both carrying the recessive allele.

• The result of a hybrid cross; they contain two genes for each trait, both carrying the dominant allele.

• The result of crossing two true breeding plants; they contain two genes of identical alleles.

In a pedigree chart, women are represented by

• Circles

• Diamonds

• Squares

• Stars

In the picture, the arrow labeled 1 corresponds to ______ and arrow 2 corresponds to _________.

• replication, transcription

• translation, transcription

• transcription, replication

• transcription, translation