Genetic and Environmental Influence on Behavior
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Questions and Answers

What is the genetic mechanism that determines the sex of an individual?

  • The presence of certain alleles in the ovum
  • The dominant genes expressed in the zygote
  • The number of chromosomes in the ovum
  • The type of chromosome provided by the sperm (correct)

If a male provides a Y chromosome during fertilization, what will be the result?

  • XX pairing
  • XY pairing (correct)
  • ZZ pairing
  • YY pairing

What is the genotype of a female offspring?

  • XX (correct)
  • ZZ
  • YY
  • XY

Which statement accurately describes the phenotype of a male child?

<p>Has an XY genotype (A)</p> Signup and view all the answers

What is the term for different forms of a gene inherited from parents for a given trait?

<p>Heterozygous (A)</p> Signup and view all the answers

Which trait is expressed when two competing traits are present?

<p>Dominant trait (A)</p> Signup and view all the answers

What does the phenotype of an organism refer to?

<p>The observable trait actually seen in an organism (C)</p> Signup and view all the answers

What kind of approach involves studying unrelated people with different genetic backgrounds but similar environmental backgrounds?

<p>Adoption study approach (A)</p> Signup and view all the answers

In adoption studies, if similarities in children's characteristics can be attributed to environmental influences, what does this suggest?

<p>Minimal impact of genetics (C)</p> Signup and view all the answers

When examining people based on their degree of genetic similarity, what does a high association between biological parents and their children indicate?

<p>Strong genetic influence (B)</p> Signup and view all the answers

If there is a stronger trait association between adoptive parents and their children than between biological parents and their children, what does this suggest?

<p>Stronger environmental influence from adoptive parents (A)</p> Signup and view all the answers

What does the occurrence of a trait at similar levels among genetically similar individuals but at different levels among genetically distant individuals indicate?

<p>Significant genetic influence (B)</p> Signup and view all the answers

In which situation do signs point to the importance of genetics in determining the expression of a trait?

<p>When there is a weak correlation between biological parents and children (D)</p> Signup and view all the answers

Which approach is used to investigate the relative importance of genetics and environment in determining traits?

<p>Family study approach (B)</p> Signup and view all the answers

Which type of inheritance is responsible for the production of a particular trait?

<p>Polygenic inheritance (C)</p> Signup and view all the answers

What is the term used to describe the potential degree of variability in the expression of a trait due to environmental conditions?

<p>Reaction range (A)</p> Signup and view all the answers

Which genetic trait is expressed as a combination of two genes rather than a purely dominant or recessive manner?

<p>Blood type (C)</p> Signup and view all the answers

What is the term for a person who carries a recessive gene but does not express the associated trait?

<p>Carrier (C)</p> Signup and view all the answers

In polygenic inheritance, how many children, out of four, are expected to inherit two dominant genes and not have PKU?

<p>None (C)</p> Signup and view all the answers

What genetic disorder has been prevalent in the royal families of Europe, as seen in Queen Victoria's descendants?

<p>Hemophilia (B)</p> Signup and view all the answers

If both parents are carriers for PKU (pP), what percentage of their children are expected to be afflicted with PKU?

<p>~25% (C)</p> Signup and view all the answers

What is one reason intelligence has generated a significant amount of research?

<p>Intelligence is strongly related to success in scholastic endeavors. (B)</p> Signup and view all the answers

What does the text suggest about the influence of heredity on physical characteristics like blood pressure and respiration rates?

<p>Closely related individuals tend to have more similar blood pressure and respiration rates. (C)</p> Signup and view all the answers

Based on the text, what can be said about the effect of genetics on obesity?

<p>Obesity has a strong genetic component. (A)</p> Signup and view all the answers

In the study with identical twins on high-calorie diets, what did the results show?

<p>Some twins gained almost 3 times as much weight as others. (C)</p> Signup and view all the answers

What distinguishes human intelligence from that of other species according to the text?

<p>Intelligence is a central characteristic that differentiates humans. (B)</p> Signup and view all the answers

In terms of height, what is the trend observed between parents and their children discussed in the text?

<p>Short parents have tall children. (B)</p> Signup and view all the answers

What aspect of weight gain in identical twins was highlighted in the study mentioned in the text?

<p>Different pairs of twins varied substantially in weight gain. (C)</p> Signup and view all the answers

How does the information presented suggest that environment influences traits like obesity?

<p>Environmental factors can interact with genetics to influence obesity. (B)</p> Signup and view all the answers

What role do genetics play in determining physical characteristics like blood pressure and respiration rates?

<p>Physical characteristics are influenced by both genetics and environment. (C)</p> Signup and view all the answers

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