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New  Practice Test for
Heredity & Environment

Ψ  Note: These questions are part of a larger data base of questions on Chapter 3 & are selected to represent the type of question you should expect on unit exam one. You can, in fact, expect to see many of these very same questions on that exam. Exam questions, however, may deal with topics not covered in the self tests or in lectures but are discussed in your textbook. You are responsible for the content of your text book plus the content of lectures, interactive activities, & material on the web site.

    Use these sample questions to test yourself & to practice for the test. Click on your choice to see if you are right.

1. Human reproductive cells are called

•  zygotes.
 •  chromosomes.
  •  genes.
   •  gametes.

2. To say that a trait is polygenic means that:

a The trait is multifactorial.
b Most people carry genes for that trait.
c Several genes must be present for the trait to be inherited.
d Many genes make it more likely that the trait will be inherited.

3. The determining factor in a zygote's sex is

a the number of sperm the father has.
b which sperm reaches the ovum first.
c the time it takes for the sperm and ovum to meet.
d which ovum becomes fertilized.

4. Monozygotic twins

a originate from one zygote
b are fraternal.
c occur in about 1 out of 2, 000 pregnancies
d all of the above

5. Genes are segments of molecules of:

a genotype.
b karyotype.
c phenotype.
d deoxyribonucleic acid.

6. The dominant-recessive pattern is

a mdizygotic.
b monozygotic
c additive
d nonadditive

7. Most of the known genetic traits are:

a seriously disabling.
b sex-linked.
c dominant.
d recessive.

8. Boys can inherit an X-linked trait from their

a mother.
b father.
c father's mother.
d mother or father.

9. Which of the following is a predisposing factor for schizophrenia?

a birth during late winter.
b inadequate oxygen at birth.
c having a close relative who is schizophrenic.
d all of these.

10.  Trisomy - 21 is called

•  fragile-X syndrome.
 •  muscular dystrophy.
  •  Down syndrome.
   •  Klinefelter's syndrome.

It's a Mickey Mouse World , isn't it?

11. A karyotype

a shows a chromosomal portrait.
b is a persons demonstrated traits.
c consists of all the influencing genes for hearing.
d is a chart of the family history.

12. The sum total of all the genes a person inherits is called

a an additive pattern.
b a dominant pattern.
c the genotype.
d the phenotype.

13. Suppose a particular couple has a 50/50 chance of having a child with abnormalities. Who makes the decision about having the baby?

a the doctor
b the genetic counselor
c the couple
d the government through the courts

14. The expression of shyness depends on

a genetics.
b cultural factors
c parental example
d all of the above

15. In the male, the 23rd pair of chromosomes is designated ____ ; in the female its designated ____.


16. When a zygote splits, the two identical, independent clusters that develop become;

a dizygotic twins.
b farernal twins.
c trizygotic twins
d monozygotic twins.

17. Genotype is to phenotype as ________ is to ________.

a genetic potential; physical expression
b physical expression; genetic potential
c gamete; zygote
d sperm; ovum

18. The genes that influence height & skin color interact according to the ______ pattern.

a additive
b X–linked
c nonadditive
d dominant-recessive

19. If a man carries the recessive gene for cystic fibrosis & his wife does not, the chances of their offspring having cystic fibrosis is;

a zero.
b one in four.
c fifty-fifty.
d dependent on the wife’s ethic background.

20.  The effect of a gene on a particular physical characteristic is dependant on whether the gene comes from the mother or the father. This effect is called

•  the dominant recessive pattern.
 •  the additive pattern.
  •  molecular genetics.
   •  imprinting.

21.  Type of genetic test administered to all newborns in the US?

•  CVS
 •  PKU
  •  Amniocentesis
   •  Alpha-Fetoprotein Assay

Lifespan Growth & Development
Robert C. Gates
Neurosis is the inability to tolerate ambiguity.  -- Freud

How bold one gets when one is sure of being loved!

- Sigmund Freud