In pea plants, the trait for tall stems is dominant over the trait for short stems. If two heterozygous tall plants are crossed, what percentage of the offspring would be expected to have the same phenotype as the parents?

• 100%

• 75%

• 50%

• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Hemophilia is a sex-linked, recessive trait. Which of the following describes the probability of hemophilia in the offspring of a man who does not have hemophilia and a woman whose father is a hemophiliac?

• Each of their sons will have hemophilia.

• None of their daughters will have hemophilia.

• Their sons have a 25% chance of having hemophilia.

• There is a 50% chance that their daughters will have hemophilia.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Alleles for the A and B blood cell antigens are codominant. The condition where no antigens are present on the blood cells (type O blood) is a recessive trait. Which set of parents can most likely produce a child with type O blood?

• one parent with type AB blood, and the other parent with type A blood

• one parent with type AB blood and the other parent with type O blood

• one parent with heterozygous type A blood, and the other parent with type O blood

• one parent with homozygous type A blood, and the other parent with homozygous type B blood

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

This diagram shows a pedigree for a recessive genetic disorder. What is the genotype of individual 6?

• XH XH

• XH Xh

• XH Y

• Xh Y

Tags

NGSS.HS-LS3-1

The table lists the trials for fruit color where allele R exhibits incomplete dominance over allele R'. Heterozygous fruit have orange phenotypes. What percent of offspring are expected to have an orange phenotype if the parent plants are orange (RR') and yellow (R'R')?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Genetic screening is a procedure where a person’s DNA is analyzed to identify a genetic predisposition to lethal diseases. One advantage of genetic screening is that it allows doctors to prevent and treat diseases before patients have symptoms. Which of the following is a disadvantage of genetic screening?

• Genetic screening results could be used to determine inheritance patterns in families

• The likelihood of a child contracting an inheritable disease could be predicted by genetic screening.

• A doctor could combine a patient’s current symptoms with genetic screening results to diagnose and treat the patient.

• Insurance companies could drop a patient’s medical coverage based on potential medical issues projected by genetic screening.

Genetic engineering has both positive and negative outcomes. One of the most common areas where genetic engineering is used is in agriculture. If farmers plant more genetically modified crops, which of the following negative outcomes could occur?

• An increase in the use of pesticides

• A decrease in genetic diversity of the crops

• An increase in the contamination of the water supply

• A decrease in crop productivity

Tags

NGSS.HS-LS2-2

The illustration shows four lobes of the human brain. What lobe is designated by label 2?

• temporal

• parietal

• occipital

• frontal

Which lobe of the brain is designated by number 4?

• occipital lobe

• parietal lobe

• frontal lobe

• temporal lobe

Sexual reproduction is vital to the propagation of the human race. Which of the following sequences represents the correct order of events in the formation of a human fetus?

• Zygote -> blastocyst -> embryo -> fertilization

• Fertilization -> zygote -> blastocyst -> embryo

• Blastocyst -> embryo -> differentiation -> zygote

• Fertilization -> growth -> differentiation -> zygote