Genetics Unit 4 Science

Artificial selection is another name for ________

• selective breeding

• heterozygous

• gene

• bacteria

People living in some countries have a difficult time obtaining foods that are high in vitamin A. Which advantage of genetic technologies would these people most benefit from?

• higher tolerance of crops to temperature changes

• lowered cost of food production

• decreased crop resistance to disease

• increased nutritional value of crops

Which statements describe gene therapy? Check all that apply. 

• It involves the modification of DNA.

• It attempts to replace a mutated gene with normal DNA.

• It does not always cure patients who use it.

• It cures all cases of cystic fibrosis.

• It is easy to apply to all cells affected by the disorder.

Which procedure is an attempt to correct a genetic disorder by replacing a mutated gene with a normal allele?

• selective breeding

• cloning

• artificial selection

• gene therapy

Clarence made a diagram to compare codominance and incomplete dominance. Which label belongs in the area marked Y?

• Neither allele is dominant.

• An intermediate phenotype is expressed in offspring.

• One allele is dominant over the other.

• Both dominant alleles are fully expressed in offspring.

Which statement describes the blood type of a person with the alleles I^Ai?

• It is type AB because I and i are codominant.

• It is type AB because A and i are codominant.

• It is type A because i is dominant and A is recessive.

• It is type A because A is dominant and i is recessive.

Which best describes the offspring of a curly-haired dog (CC) with a straight-haired dog (SS), assuming incomplete dominance?

• All the offspring will be hairless.

• All the offspring will have straight hair.

• All the offspring will have curly hair.

• All the offspring will have wavy hair.

Which best describes the offspring of a solid-colored cow (CC) with a spotted cow (SS), assuming the alleles are codominant?

• All the offspring will have stripes.

• All the offspring will be completely solid.

• All the offspring will be completely spotted.

• All the offspring will have a mixture of spots and solid colors.

Which are ways of showing probability? Select 4 options.

• 50%

• 3/4

• 25%

• 1 x 10⁴

• 2/4

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If someone has a dominant phenotype, their genotype can either be heterozygous or homozygous. The diagram shows a Punnett square for a particular trait among two parents, but one letter of a parent’s genotype is missing.   Which describes the letter that belongs where the question mark is?

• T because there are offspring that are heterozygous

• T because there are offspring that are homozygous

• t because there are offspring that are homozygous. 

• t because there are offspring that are heterozygous.