Exam 2: Biological Beginnings

Melody and Harmony are identical twins. This means that they developed from

A cell that contains 23 pairs of chromosomes divides by mitosis to form two new cells. How many pairs of chromosomes does each new cell contain?

Brianna goes to a doctor who specializes in identifying genetic flaws to help prevent the risk of abnormalities. This doctor is called

Except for the sperm and the egg, all cells in the human body have ________ chromosomes.

According to life-span developmentalist Paul Baltes (2003), the benefits conferred by evolutionary selection decrease with age. Natural selection has not weeded out many harmful conditions and nonadaptive characteristics that appear among older adults. Why?

A(n) ________ gene overrides the potential influence of a recessive gene.

Which of the following women has the highest probability of giving birth to a child with Down syndrome?

Timothy's wife is having trouble conceiving a child despite reports on her reproductive fitness being normal. However, on examining Timothy, the doctor determines that his testes are undeveloped, and that he has enlarged breasts. He also observes that Timothy is unusually tall, although his parents and grandparents are of short stature. The doctor informs Timothy that these symptoms are due to Timothy having an extra X chromosome, making him XXY instead of XY. Timothy most likely suffers from

Phenotypes include ________ and ________ characteristics.

Jason, a 4-year-old, has an intellectual disability and has shorter limbs than other children his age. His pediatrician observes that Jason has a protruding tongue and an extra fold of skin over his eyelids. Jason's mother informs the pediatrician that she was 30 at the time of Jason's birth and that he was born with a flat skull. From this information, the pediatrician will most likely diagnose Jason with

Which of the following is most likely a characteristic of persons with Klinefelter syndrome?

________ is the field that seeks to discover the influence of heredity and environment on individual differences in human traits and development.

Which of the following is true of mitosis?

________ is a genetic abnormality in which delayed blood clotting causes internal and external bleeding.

In the context of approaches to gene identification and discovery, ________, in which the goal is to discover the location of a gene (or genes) in relation to a marker gene (whose position is already known), is often used to search for disease-related genes.

Xiomarra is tall with dark curly hair and brown eyes. She is outgoing and friendly. The way that Xiomarra's genotype is expressed in these observable characteristics is referred to as her ________.

What is the psychological perspective that emphasizes the importance of adaptation, reproduction, and "survival of the fittest" in shaping human behavior?

Name the theorist who published On the Origin of Species, in 1859, that outlined his/her theory of natural selection.

Amniocentesis brings a small risk of

Paul Baltes says that natural selection among humans operates mainly during the ________ of life.