Genetics Test Review

Which of the following objects could be used to model the structure of a DNA molecule?

• a snowflake

• a ladder

• a three-dimensional cube

• a branching tree

Two tall pea plants, not true for tallness, are crossed. 56 tall plants and 14 short plants are produced from this cross. The allele for tallness is

• complete

• incomplete

• recessive

• dominant

In a cell, gene mutations affect:

• the production of nucleic acids

• the production of lipids

• the production of carbohydrates

• the production of proteins

What is the name given to a specific region of DNA that codes for a particular hereditary trait?

• chromatid

• centromere

• centriole

• gene

amino acids are joined together in cells to make:

• carbohydrates

• proteins

• phosphoric acids

• fatty acids

Which part of the DNA structure is responsible for the variation we see within and among organisms?

• the arrangement of the sugar molecules

• the arrangement of the nitrogen bases

• the arrangement of the phosphate molecules

• the arrangement of the deoxyribose molecules

The code for a protein is found in which of the following cell structures?

• in DNA only

• in genes only

• in DNA and genes only

• in DNA, genes, and chromosomes

What determines the order in which amino acids are assembled into proteins?

• the order of the genes on a chromosome

• the arrangement of the chromosomes in a cell

• the order of the three nitrogen bases in a DNA molecule

• the number of nitrogen bases in the DNA molecule

A black guinea pig crossed with a white guinea pig resulted in black offspring. What type of trait is black fur?

• dominant

• incomplete

• recessive

• sex-linked

In order for a gene mutation to be passed down to offspring, in what type of cell must it occur?

• It must occur in a muscle cell.

• It must occur in a blood cell.

• It must occur in a uterine cell.

• It must occur in a gamete.