BIO-111 Exam #3 Review

Front

What is incomplete dominance?

Back

A genetic situation in which one allele does not completely dominate another allele, resulting in a phenotype that is a blend of the two alleles.

Front

What base pair combinations are found in RNA?

Back

A = U, C = G.

Front

What is the main difference in DNA replication between prokaryotes and eukaryotes?

Back

Prokaryotic chromosomes have a single origin of replication, whereas eukaryotic chromosomes have many.

Front

What is chromatin?

Back

The complex of DNA and proteins that forms chromosomes within the nucleus of eukaryotic cells.

Front

What occurs during telophase of mitosis?

Back

Unpacking of chromosomes and the formation of a new nuclear envelope.

Front

What is codominance?

Back

A genetic scenario where both alleles in a heterozygote are fully expressed, resulting in a phenotype that shows both traits.

Front

What are Okazaki fragments?

Back

Short sequences of DNA nucleotides synthesized discontinuously and later linked together during DNA replication.

Front

What is the role of histones in DNA organization?

Back

Histones are proteins that help package and order DNA into structural units called nucleosomes.

Front

What is the function of cohesin?

Back

Cohesin is a protein complex that holds sister chromatids together until they are separated during cell division.

Front

What is the significance of the nuclear envelope?

Back

The nuclear envelope is a double membrane that encloses the nucleus, separating it from the cytoplasm and regulating the passage of materials.