Question 1

How might carriers of deleterious genes be recognized?

Accepted Answer

Carriers of deleterious genes may be recognized if their offspring show symptoms of the condition or disease caused by the deleterious gene.Because the genes are usually recessive,they would show phenotypically only if the offspring received the recessive genes from both parents.A pedigree analysis may be done to trace a particular trait back through several generations.Blood chemistry tests (and DNA probing)may also be done if particular genetic traits are suspected.

Question 2

Match the following:
-The dominant gene is expressed when present; the recessive gene is expressed only in the absence of the dominant gene.

Accepted Answer

A) Sex-linked inheritance 
B) Polygenic inheritance 
C) Dominant-recessive inheritance 
D) Multiple-allele inheritance 
E) Incomplete dominance 
A) Sex-linked inheritance 
B) Polygenic inheritance 
C) Dominant-recessive inheritance 
D) Multiple-allele inheritance 
E) Incomplete dominance C

Question 3

Match the following:
-Means by which genes trade places,some maternal and some paternal on each chromosome.

Accepted Answer

A) Independent assortment 
B) Chromosome segregation 
C) Chromosome crossover 
D) Gene recombination 
A) Independent assortment 
B) Chromosome segregation 
C) Chromosome crossover 
D) Gene recombination C

Question 4

What is (are)the genotype(s)of the first-generation offspring?

Accepted Answer

The genotypes of the

Question 5

Hereditary characteristics are transmitted to offspring by genes.

Accepted Answer

A) True 
 B)False

Question 6

Inheritance of stature (height)in humans is probably due to ________.

Accepted Answer

A)  polymorphism 
B)  polygene inheritance 
C)  incomplete dominance 
D)  polyploidy 
A)  polymorphism 
B)  polygene inheritance 
C)  incomplete dominance 
D)  polyploidy

Question 7

A woman has blond hair and brown eyes.This statement is best described as indicating ________.

Accepted Answer

A)  genotype 
B)  phenotype 
C)  allelic pairs 
D)  recessive traits 
A)  genotype 
B)  phenotype 
C)  allelic pairs 
D)  recessive traits

Question 8

The cleft chin trait follows a dominant-recessive inheritance pattern with cleft chin being the dormant trait.John is heterozygous for a cleft chin as is his wife Betty.John and Betty have three kids all of which have a cleft chins.According to Punnett square prediction what is the likely hood that their next child will have a cleft chin?

Accepted Answer

A)  25% chance the same probability for all subsequent children 
B)  0% because the three pervious children have cleft chins already 
C)  100% chance because the mother and father both have cleft chins 
D)  75% chance the same probability for all subsequent children 
A)  25% chance the same probability for all subsequent children 
B)  0% because the three pervious children have cleft chins already 
C)  100% chance because the mother and father both have cleft chins 
D)  75% chance the same probability for all subsequent children

Question 9

Those characteristics that can be determined on superficial inspection of an individual are known as ________.

Accepted Answer

A)  polyspermic 
B)  polygenic 
C)  genotypic 
D)  phenotypic 
A)  polyspermic 
B)  polygenic 
C)  genotypic 
D)  phenotypic

Question 10

A patient is heterozygous for sickle-cell anemia.Explain why the patient would have few or no symptoms of sickle-cell anemia.

Accepted Answer

Individuals heterozygous for the sicklin

Question 11

Match the following:
-Lack of skin pigmentation.

Accepted Answer

A) Cystic fibrosis 
B) Achondroplasia 
C) Albinism 
D) Tay-Sachs disease 
E) Huntington's disease 
A) Cystic fibrosis 
B) Achondroplasia 
C) Albinism 
D) Tay-Sachs disease 
E) Huntington's disease

Question 12

Match the following:
-Situation in which an individual has different alleles making up the genotype for a particular trait.

Accepted Answer

A) Allele 
B) Dominant 
C) Heterozygous 
D) Autosomes 
A) Allele 
B) Dominant 
C) Heterozygous 
D) Autosomes

Question 13

What would the parental gametes be from a cross of two second-generation,straight-shorthaired individuals?

Accepted Answer

The parental gametes

Question 14

An example of multiple-allele inheritance is ________.

Accepted Answer

A)  hair that seems to have several shades of a color 
B)  the appearance of birthmarks on the skin 
C)  the appearance of freckles on the skin 
D)  the ABO blood group 
A)  hair that seems to have several shades of a color 
B)  the appearance of birthmarks on the skin 
C)  the appearance of freckles on the skin 
D)  the ABO blood group

Question 15

Two alleles expressing exactly the same information for a trait are designated as ________.

Accepted Answer

A)  homozygous 
B)  monogamous 
C)  heterozygous 
D)  hemizygous 
A)  homozygous 
B)  monogamous 
C)  heterozygous 
D)  hemizygous

Question 16

What were the genotypes of the parental (P1)individuals?

Accepted Answer

The genotypes of the

Question 17

A chromosomal aberration in which part of a chromosome is lost is known as ________.

Accepted Answer

A)  deletion 
B)  translocation 
C)  crossing-over 
D)  inversion 
A)  deletion 
B)  translocation 
C)  crossing-over 
D)  inversion

Question 18

The second-generation phenotypes would follow what ratio? (Pair the number with a phenotype in each case.)

Accepted Answer

The second-generation phenotyp

Question 19

________ disease is a disorder of brain lipid metabolism and is an example of a recessive trait.

Accepted Answer

The answer of ________ disease is a disorder of brain...

Question 20

In meiosis the spermatozoa that are produced are genetically unlike each other and unlike the cell that produces them.This is one reason for the great variation among humans.What causes this effect?

Accepted Answer

A)  chromosome segregation and independent assortment only 
B)  crossing-over and chromosome segregation only 
C)  crossing-over and independent assortment only 
D)  crossing-over, chromosome segregation, and independent assortment 
A)  chromosome segregation and independent assortment only 
B)  crossing-over and chromosome segregation only 
C)  crossing-over and independent assortment only 
D)  crossing-over, chromosome segregation, and independent assortment

Exam 29: Heredity

How might carriers of deleterious genes be recognized?

Match the following: -The dominant gene is expressed when present; the recessive gene is expressed only in the absence of the dominant gene.

Match the following: -Means by which genes trade places,some maternal and some paternal on each chromosome.

What is (are)the genotype(s)of the first-generation offspring?

Hereditary characteristics are transmitted to offspring by genes.

Inheritance of stature (height)in humans is probably due to ________.

A woman has blond hair and brown eyes.This statement is best described as indicating ________.

Those characteristics that can be determined on superficial inspection of an individual are known as ________.

A patient is heterozygous for sickle-cell anemia.Explain why the patient would have few or no symptoms of sickle-cell anemia.

Match the following: -Lack of skin pigmentation.

Match the following: -Situation in which an individual has different alleles making up the genotype for a particular trait.

What would the parental gametes be from a cross of two second-generation,straight-shorthaired individuals?

An example of multiple-allele inheritance is ________.

Two alleles expressing exactly the same information for a trait are designated as ________.

What were the genotypes of the parental (P1)individuals?

A chromosomal aberration in which part of a chromosome is lost is known as ________.

The second-generation phenotypes would follow what ratio? (Pair the number with a phenotype in each case.)

________ disease is a disorder of brain lipid metabolism and is an example of a recessive trait.

In meiosis the spermatozoa that are produced are genetically unlike each other and unlike the cell that produces them.This is one reason for the great variation among humans.What causes this effect?

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