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Lifespan Development > Genes & Environment > Flashcards

Genes & Environment Flashcards

1
Q

The genetic endowment that members of a particular species have in common; a contributor to universal species traits and patterns of maturation.

A

species heredity

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2
Q

The evolutionary principle that individuals who have characteristics advantageous for survival in a particular environment are most likely to survive and reproduce. Over many generations, this process of “survival of the fittest” will lead to changes in a species and the development of new species.

A

natural selection

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3
Q

Change in a species achieved not through biological evolution but through learning and passing on from one generation to the next new ways of adapting to the environment.

A

cultural evolution

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4
Q

The moment of fertilization, when a sperm penetrates an ovum, forming a zygote.

A

conception

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5
Q

A single cell formed at conception from the union of a sperm and an ovum.

A

zygote

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6
Q

A threadlike structure made up of genes; in humans, there are ?

A

chromosome

46 in the nucleus of each cell

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7
Q

The process in which a germ cell divides, producing sperm or ova; in humans, the products of meiosis normally contain ?.

A

meiosis

23 chromosomes

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8
Q

The process in which a cell duplicates its chromosomes and then divides into two genetically
identical daughter cells.

A

mitosis

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9
Q

Molecule whose chemical code makes up chromosomes and serves as our genetic endowment; it is made up of sequences of the chemicals ?

A

DNA Deoxyribonucleic acid
A (adenine), C (cytosine), G (guanine), and
T (thymine).

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10
Q

One of the possible variants of a particular gene.

A

allele

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11
Q

A massive, government-sponsored effort to decipher

the human genetic code.

A

Human Genome Project

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12
Q

A process in which genetic material is exchanged between pairs of chromosomes during meiosis.

A

crossing over

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13
Q

A chromosomal portrait created by staining chromosomes, photographing them under a high-power microscope, and arranging them into a predetermined pattern.

A

karyotype

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14
Q

The genetic endowment that an individual inherits.

A

genotype

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15
Q

The way in which a person’s genotype is expressed in observable or measurable characteristics.

A

phenotype

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16
Q

The activation of particular genes in particular cells of the body at particular times in life.

A

gene expression

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17
Q

The genetic mechanism through which a characteristic is influenced by only one pair of genes, one gene from the mother and its partner from the father.

A

single gene-pair inheritance

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18
Q

A condition in which a stronger gene fails to mask all the effects of a weaker partner gene; a phenotype results that is similar but not identical to the effect of the stronger gene.

A

incomplete dominance

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19
Q

In genetics, an instance in which two different but equally powerful genes produce a phenotype in which both genes are expressed.

A

codominance

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20
Q

An attribute determined by a gene that appears on one of the two types of sex chromosomes, usually the X chromosome.

A

sex-linked characteristic

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21
Q

A deficiency in the blood’s ability to clot. It is more common among males than females because it is associated with a sex-linked gene on the X chromosome.

A

hemophilia

22
Q

A characteristic influenced by the action of many gene pairs rather than a single pair.

A

polygenic trait

23
Q

A change in the structure or arrangement of one or more genes that produces a new phenotype.

A

mutation

24
Q

A genetic blood disease in which red blood cells assume an unusual sickle shape and become inefficient at distributing oxygen throughout the body.

A

sickle-cell disease

25
Q

Conditions in which a child has too few, too many, or incomplete chromosomes because of errors in the formation of sperm or ova.

A

chromosome abnormalities

26
Q

A chromosomal abnormality in which the child has inherited an extra 21st chromosome and is, as a result, mentally retarded; also called trisomy 21.

A

Down syndrome

27
Q

A sex chromosome abnormality in which females inherit only one X chromosome (XO); they remain small in stature, fail to develop secondary sex characteristics, and may show some mental deficiencies.

A

Turner syndrome

28
Q

A sex chromosome abnormality in which males inherit two or more X chromosomes; these males fail to develop secondary sex characteristics and often show deficiencies on tests of verbal abilities.

A

Klinefelter syndrome

29
Q

A chromosome abnormality in which one arm of the X chromosome is only barely connected to the rest of the chromosome; the most common hereditary cause of mental retardation.

A

fragile X syndrome

30
Q

A service designed to inform people about genetic conditions they or their unborn children are at risk of inheriting.

A

genetic counseling

31
Q

In genetics, individuals who possesses a recessive gene associated with a disease and who, although they do not have the disease, can transmit the gene for it to offspring.

A

carrier

32
Q

A genetic disease caused by a single, dominant gene that strikes in middle age to produce a deterioration of physical and mental abilities and premature death.

A

Huntington’s disease

33
Q

Method of examining physical organs by scanning them with sound waves—for example, scanning the womb and thereby producing a visual outline of the fetus to detect gross abnormalities.

A

ultrasound

34
Q

A method of extracting amniotic fluid from a pregnant woman so that fetal body cells within the fluid can be tested for chromosomal abnormalities and other genetic defects.

A

amniocentesis

35
Q

An alternative to amniocentesis in which a catheter is inserted through the cervix to withdraw fetal cells from the chorion for prenatal testing to detect genetic defects.

A

chorionic villus sampling (CVS)

36
Q

A noninvasive method of prenatal diagnosis involving testing for substances in maternal blood; more recently, analysis of fetal cells that have slipped through the placenta into the mother’s blood.

A

maternal blood sampling

37
Q

Prenatal diagnostic procedure in which a mother’s eggs are fertilized in the laboratory using in vitro fertilization techniques, DNA tests are conducted on the first cells that result from mitosis of each
fertilized egg, and only eggs that do not have
chromosome abnormalities or genes associated
with disorders are implanted in the uterus.

A

preimplantation genetic diagnosis

38
Q

The scientific study of the extent to which genetic and environmental differences among individuals are responsible for differences among them in traits such as intelligence and personality.

A

behavioral genetics

39
Q

The amount of variability in a population on some trait dimension that is attributable to genetic differences among those individuals.

A

heritability

40
Q

A method of studying genetic influence that involves deliberately determining whether a trait can be bred in animals through selective mating.

A

selective breeding

41
Q

Method of studying genetic and environmental
influence in which the similarity of identical twins is compared to that of fraternal twins, often in studies involving both twins reared together and twins reared apart.

A

twin study

42
Q

Method of studying genetic and environmental influence that involves determining whether adopted children are more similar to their biological parents or adoptive parents.

A

adoption study

43
Q

The percentage of cases in which a particular attribute is present for both members of a pair of people (e.g. twins) if it is present for one member.

A

concordance rate

44
Q

Experiences that individuals living in the same home environment share and that work to make them similar.

A

shared environmental influences

45
Q

Experiences unique to the individual that are not
shared by other members of the family and that
tend to make members of the same family different.

A

nonshared environmental influences

46
Q

The analysis of particular genes and their effects, including the identification of specific genes that influence particular traits and the comparison of animals or humans who have these specific genes and those who do not.

A

molecular genetics

47
Q

A genetically based pattern of tendencies to respond in predictable ways; building blocks of personality such as activity level, sociability, and emotionality.

A

temperament

48
Q

The phenomenon in which the effects of people’s genes depend on the kind of environment they experience and in which the effects of the environment depend on their genetic endowment.

A

gene–environment interaction

49
Q

A systematic interrelationship between an individual’s genes and that individual’s environment; ways in which genes influence the kind of home environment provided by parents (passive gene–
environment correlation), the social reactions
to the individual (evocative gene–environment
correlation), and the types of experiences the
individual seeks (active gene–environment
correlation).

A

gene–environment correlation

50
Q

A genetic disease in which the child is unable to metabolize phenylalanine; if left untreated, it soon causes hyperactivity and mental retardation.

A

phenylketonuria (PKU)

51
Q

Interventions that involve substituting normal genes for the genes associated with a disease or disorder; otherwise altering a person’s genetic makeup.

A

gene therapy

52
Q

Undifferentiated, primitive cells that
have the ability both to multiply and to differentiate
into a variety of specific cells.

A

stem cell

Lifespan Development (17 decks)

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