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Exam 2: Biological Beginnings

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Question 71

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Sherry, a 3-year-old, has an extra copy of chromosome 21. She is often made fun of by other children because of her unusual looks; she has a round face and her skull is flat. She has a protruding tongue, and she finds it difficult to play because of her short limbs. Her parents find that her mental abilities are impaired when compared with other children her age. Sherry is most likely suffering from a chromosomal abnormality called ________.

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Question 72

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In human beings, by the end of meiosis, each egg or sperm has ________ chromosomes.

A) 46 paired
B) 23 unpaired
C) 23 paired
D) 46 unpaired

E) A) and B)
F) None of the above

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Question 73

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Which of the following is the main risk factor that a couple must be aware of when undergoing fertility treatments?

Joshua, a two-year-old, has been diagnosed with ________, a blood disorder that limits the body's oxygen supply and can cause joint swelling and heart and kidney failure. This genetic disorder can be treated through penicillin, pain medication, antibiotics, blood transfusions, and hydroxyurea.

During ________, a cell of the testes in men or ovaries in women duplicates its chromosomes and then divides twice, thus forming four cells, each of which has only half the genetic material of the parent cell.

Rachel loves to read books, and she also encourages her daughter to read by regularly taking her to the local library and buying her lots of books. Rachel's daughter is now an avid reader. This reflects a(n) ________ correlation.

Tamara, an African American, is born with a genetic disorder that causes her body's red blood cells to become hook shaped instead of being disk shaped, impairing the normal oxygen-carrying capacity of the cells. The doctors explain to Tamara's parents that this condition, however, makes her resistant to malaria. Which of the following disorders is Tamara most likely suffering from?

Gwendolyn, a pregnant woman, is undergoing a prenatal medical procedure in which her doctor directs high-frequency sound waves into her abdomen to create a visual representation of the fetus's inner structures. The doctor informs her that the procedure will reveal the number of fetuses she is carrying, detect abnormalities in the fetus, and give clues to the sex of the baby. In this scenario, which of the following prenatal medical procedures is Gwendolyn most likely undergoing?

Yelena is an outgoing person; therefore, people naturally tend to like her and find her personable. According to Scarr-McCartney, which genotype-environment interaction does this best represent?

Red-feathered and blue-feathered birds occupy the same environment. The birds with the red feathers are better able to survive and avoid predators. This means that the population of red-feathered birds will increase in future generations. This illustrates the process of

Define gene × environment (G × E) interaction. Give an example of a study (either your own or one from the book) that could illustrate the interaction between genes and the environment.

________ develop from a single zygote that splits into two genetically matching replicas, each of which becomes a person.

Jule's 23rd chromosome pair consists of an X chromosome and a Y chromosome. This indicates that Jule

Which of the following is true of phenylketonuria?

As an alternative to "________ evolutionism" presented in evolutionary psychology, Albert Bandura proposed a ________ view.

Erin, a 90-year-old, is healthy and leads an active lifestyle. Most of her relatives have lived to an old age. Researchers have found that Erin's family carries genes related to stress resistance, immunity, and metabolism that help extend life by repairing and protecting body tissues. In this scenario, which of the following genes is most likely responsible for Erin living to an old age?

In some cases of genotypic expression, one gene of a pair always exerts its effects overriding the potential influence of the other gene. This is the ________ principle.

Mateo, an infant, is on a special diet as his parents are aware that he has a genetic disorder in which he cannot metabolize phenylalanine, an amino acid. Mateo's parents are also aware of the importance of this diet and that excess phenylalanine buildup in the infant will produce intellectual disability and hyperactivity. This genetic disorder results from a

Which of the following would be an appropriate course of treatment for a person diagnosed with cystic fibrosis?

A recessive gene exerts its influence only if both genes of a pair are