When researchers try to estimate the heritability of a human behavior, what are the main kinds of individuals they consider?
> Twins and adopted children
People from non-western cultures
Newborns and infants
Uneducated people living in educated societies
Twins and adopted children
Units of heredity that maintain their structural identity from one generation to another are:
- enzymes
- mutations
- nucleic acids
- genes
genes
Units of heredity that maintain their structural identity from one generation to another are:
- enzymes
- mutations
- nucleic acids
- genes
genes
Chromosomes consist of large, double-stranded molecules of:
- deoxyribonucleic acid
- ribonucleic acid
- autosomal genes
- recombination genes
deoxyribonucleic acid
A strand of DNA serves as a template (model) for the synthesis of ___________.
- chromosomes
- RNA
- proteins
- carbohydrates
RNA
Enzymes serve as __________.
- genetic templates
- physiological markers of chemical reactions in the body
- biological catalysts that regulate chemical reactions in the body
- catalysts for the synthesis of protein molecules
biological catalysts that regulate chemical reactions in the body
Chemically, what is the route from genes to their expression?
- DNA to proteins to RNA
- DNA to RNA to proteins
- proteins to DNA to RNA
- RNA to DNA to proteins
DNA to RNA to proteins
A person with two recessive genes is considered to be _____ for that trait.
- Homozygous
- heterozygous
- unitary
- marginal
Homozygous
Recessive genes manifest their effects only when the individual is ____ for them.
- sex limited
- homo sapien
- homozygous
- heterozygous
homozygous
Suppose “A” is a dominant gene for the ability to taste phenylthiocarbamide and “a” is a recessive gene for inability to taste it. Which of the following couple could possibly have both a child who tastes it and a child who does not?
- father AA, mother aa
- father Aa, mother AA
- father Aa, mother Aa
- father AA, mother AA
father Aa, mother Aa
Suppose all people with blonde hair have blue eyes and all people with dark hair have brown eyes. Which of the following would be the most likely explanation?
- Hair color is dominant over eye color.
- There is no genetic variability in hair or eye color in the population.
- Blue eyes are dominant over brown eyes.
- Hair and eye color are on the same chromosome.
Hair and eye color are on the same chromosome.
Suppose that adopted children are more similar to their biological parents than their adaptive parents in their preferences for a flavor of ice cream. Which of the following would be true?
- Heritability of this trait is high.
- Preferences for ice cream are determined solely by the environment.
- Flavors of ice cream are naturally selected.
- Heritability of this trait is low.
Heritability of this trait is high.
Almost all humans have 23 pairs of which of the following?
- RNA
- Chromosomes
- Genes
- Corduroys
Chromosomes
An autosomal gene is a gene:
- On the X chromosome.
- On the Y chromosome.
- On any chromosome other than the X or Y chromosome.
- That shows no evidence of crossing over.
On any chromosome other than the X or Y chromosome.
Which of the following pairs of sex chromosomes would be found in a normal male mammal?
- XX
- XY
- YY
- YZ
XY
In humans, which chromosome(s) contain(s) few genes?
- All human chromosomes contain few genes.
- Both the X and Y chromosomes contain few genes.
- The X chromosome contains few genes.
- The Y chromosome contains few genes.
The Y chromosome contains few genes.
In general, when biologists speak of sex-linked genes they are referring to genes on:
- autosomal chromosomes
- more than one chromosome
- the X chromosome
- the Y chromosome
the X chromosome
Color vision deficiency is more common in males than in females because it is controlled by a:
- sex-limited gene
- Y-linked gene
- dominant X-linked gene
- recessive X-linked gene
recessive X-linked gene
Sex-limited genes are found on:
- X chromosomes only
- Y chromosomes only
- X AND Y chromosomes
- any chromosomes
any chromosomes
A gene is found that controls the age at which a man grows bald, if at all. That gene seldom affects women, even if they have the gene. What kind of gene is this MOST likely to be?
- an X-linked gene
- a sex-limited gene
- a sex-linked dominant gene
- a sex-linked recessive gene
a sex-limited gene
Under what conditions are the effects of sex-limited genes demonstrated?
- When they are dominant
- When they are homozygous
- When particular hormones are present
- When they appear on the X chromosome
When particular hormones are present
If a group of individuals shares a highly similar environment, what effect does this have on the heritability estimate of a characteristic?
- Heritability will be low
- Heritability will be high
- Heritability estimates will be unaffected
- It is determined by the power of the environmental factors
Heritability will be high
If a trait has high heritability:
- hereditary differences account for none of the observed variations in that characteristic within that population.
- the environment cannot influence that trait.
- it is still possible for the environment to influence that trait.
- the trait is not influenced by heredity.
it is still possible for the environment to influence that trait.
Which of the following factors, if overlooked, may lead to an overestimation of heritability?
- Prenatal environment
- Low IQ
- Sex-linked genes
- RNA
Prenatal environment
