Chapter 7. 7·16–7·17 Some genes are linked together.

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You must read each slide, and complete any questions on the slide, in sequence.

Instructions

Check your understanding of concepts from 7·16–7·17 Some genes are linked together by answering the following questions.

1.

1. We say that genes are linked when:

they are responsible for producing different proteins that act together in the same biochemical reaction.

they are located in the same spot on two different chromosomes.

they produce a balanced polymorphism.

they are located near each other on a single chromosome.

they are responsible for producing the same protein.

Correct. (See section 7·17 Red hair and freckles: genes on the same chromosome are sometimes inherited together.)

Incorrect. (See section 7·17 Red hair and freckles: genes on the same chromosome are sometimes inherited together.)

2.

2. Which of the following statements is NOT true?

Generally, every cell carries two copies of a gene for a particular characteristic; there are exceptions.

Generally, there are two alleles possible for a characteristic; there are exceptions.

Sex-linked traits are associated more often with one gender or the other.

Genes for different characteristics are always inherited independently of each other.

Many phenotypes are the result of both the genotypic and environmental influences.

Correct. (See section 7·16 Most traits are passed on as independent features: Mendel’s law of independent assortment.)

Incorrect. (See section 7·16 Most traits are passed on as independent features: Mendel’s law of independent assortment.)

3.

3. Mendel's law of independent assortment states that the alleles at one locus separate independently of those at other loci. This law does not apply:

to identical twins.

to homozygous genes.

to genes that influence the same character.

to genes located close together on the same chromosome.

if recombination between the two loci occurs.

Correct. (See section 7·16 Most traits are passed on as independent features: Mendel’s law of independent assortment.)

Incorrect. (See section 7·16 Most traits are passed on as independent features: Mendel’s law of independent assortment.)

4.

4. The MOST IMPORTANT reason that Mendel's law of independent assortment is NOT universally true is that:

genes are almost always pleiotropic.

some genes mutate more often than others.

genes are carried on chromosomes.

half of your genes are inherited from your mother and half from your father.

some genes are sex-linked

Correct. (See section 7·16 Most traits are passed on as independent features: Mendel’s law of independent assortment.)

Incorrect. (See section 7·16 Most traits are passed on as independent features: Mendel’s law of independent assortment.)

5.

5. When crossing-over occurs, _______________ genes usually stay together.

linked

sex-linked

independently assorting

homozygous

multi-allelic

Correct. (See section 7·17 Red hair and freckles: genes on the same chromosome are sometimes inherited together.)

Incorrect. (See section 7·17 Red hair and freckles: genes on the same chromosome are sometimes inherited together.)

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