Genes, Chromosomes, and DNA Review

Which statement is true about genetic information?

• A gene is a section of DNA and is found on a chromosome in the cell's nucleus.

• A DNA molecule is a section of a gene found on the nucleus of chromosome.

• A chromosome is a section of a gene found in the nucleus of a DNA molecule.

• The nucleus of a cell contains genes that are made up of chromosomes composed of DNA.

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What relationship exists between genes and chromosomes?

• Genes are located on chromosomes which are found in the nucleus of cells.

• Genes produce chromosomes which transmit traits from one generation to another.

• Genes are made up of chromosomes which move from the nucleus to the cytoplasm.

• Genes and chromosomes produce alleles which determine the phenotype of offspring.

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Which statement about DNA is true?

• Different people can have the same copy of DNA in their cells.

• DNA is made up of genes that carry hereditary information.

• DNA controls the genotype but not the phenotype of an organism.

• DNA controls the genotype only in the second and third generations.

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Which diagram accurately represents the relationship between chromosomes, DNA, and genes?

• 
• 
• 
• 

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The drawing shows a breed of cat known as Munchkin.

The short-leg trait would be transmitted to the next generation of cats through

• fats.

• nutrients.

• genes.

• mutations.

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Which characteristic is least likely to be affected by an individual’s environment?

• height

• weight

• skin color

• eye color

In humans, the allele for having a widow's peak is dominant to having a straight hairline

Many people do not like the widow's peak so they shave it off. Will this affect their offspring?

• No. Shaving the widow's peak does not change their genotype, so the allele can still be passed on to offspring.

• No. Their offspring will have a widow's peak if they inherit both recessive alleles from the parents.

• Yes. There is no chance the offspring will be born with a widow's peak because the parents destroyed the trait.

• Yes. Offspring born with a widow's peak will have a smaller peak because the allele was damaged.

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The genotype for a specific trait is written with two letters such as BB, Bb, or bb, and a cross for a trait can be written BB x Bb. What do the two letters of the genotype represent?

• An organism's outward appearance is its phenotype.

• An organism's genotype is a result of its phenotype.

• Genes for a trait come from either the mother or father but not both parents.

• Traits are passed from both parents to offspring through pairs of genes.

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Which statement describes the relationship between DNA and an organism's phenotype?

• DNA is expressed as a gene which determines the genetic make-up of the organism.

• DNA is expressed as a gene which determines the expressed trait of the organism.

• DNA is expressed as a chromosome which determines the genetic make-up of the organism.

• DNA is expressed as a chromosome which determines the expressed trait of the organism.

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A student examines a picture of an important biological molecule in a textbook and writes four statements about the molecule in a chart.

Which statement needs to be revised to make it true?

• statement 1

• statement 2

• statement 3

• statement 4

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