Fundamental Concepts in Genetics Quiz

DNA carries genetic information through its nucleotide sequence.

Genes are segments of DNA that code for specific traits.

Phenotype refers to the physical expression of genes.

Replication is the process of duplicating DNA prior to cell division.

Heterozygous individuals possess different alleles for a gene.

Albinism is a genetic disorder resulting in a lack of melanin production.

DNA replication occurs during the interphase of the cell cycle.

A locus is the precise position of a gene on a chromosome.

Down syndrome results from the presence of an extra chromosome 21.

Phenylketonuria results from a deficiency in the enzyme required to metabolize phenylalanine.

A monohybrid cross examines the inheritance of a single trait.

During metaphase, chromosomes align at the metaphase plate.

Helicase unwinds the DNA double helix to allow for replication.

Tay-Sachs disease results from a deficiency of the enzyme hexosaminidase A.

Klinefelter syndrome results from the presence of an extra X chromosome in males (XXY).

James Watson and Francis Crick elucidated the double helix structure of DNA.

sRNA is not directly involved in protein synthesis; it plays roles in gene regulation.

Mutations are alterations in DNA sequence that may affect phenotype.

Pleiotropy refers to a single gene affecting multiple phenotypic traits.

Nondisjunction leads to an abnormal distribution of chromosomes in daughter cells.

Frameshift mutations alter the reading frame of codons, often resulting in nonfunctional proteins.

Incomplete dominance results in a heterozygous phenotype intermediate between the homozygous phenotypes.

Crossing over leads to genetic recombination between homologous chromosomes.

Epistasis occurs when one gene affects the expression of another gene.

Nondisjunction during meiosis I leads to an abnormal distribution of chromosomes in gametes.