Question 1

What is thratio of phenotypes in this case?

Accepted Answer

A) 1/2 
B) 3:1 
C) 6/16 
D) 9:3:3:1 
E) 1/16

Question 2

Four of thfivanswers listebelow arpure-breeding.Select thEXCEPTION.

Accepted Answer

A) AABB 
B) AaBB 
C) AAbb 
D) aaBB 
E) aabb

Question 3

Thmost common cystic fibrosis is causeby

Accepted Answer

A) a missing CFTR gene. 
B) an additional copy of the CFTR gene. 
C) a change in the sequence of the CFTR gene. 
D) all of these. 
E) none of these.

Question 4

Which of thfollowing designates a normal human female?

Accepted Answer

A) XXY 
B) XY 
C) XX 
D) XYY 
E) XO

Question 5

In a Punnett square, thletters with thlittlboxes represent

Accepted Answer

A) offspring genotypes. 
B) parental genotypes. 
C) gametes. 
D) offspring phenotypes. 
E) parental phenotypes.

Question 6

Multipleffects of a singlgenis known as

Accepted Answer

A) expressivity. 
B) dominance. 
C) epistasy. 
D) pleiotropy. 
E) multiple allele.

Question 7

Mendel founpea plants expressing a recessivtrait

Accepted Answer

A) were pure-breeding. 
B) appeared only in the first generation of a cross between two pure-breeding plants expressing contrasting forms of a trait. 
C) disappeared after the second generation. 
D) could be produced only if one of the parents expressed the recessive trait. 
E) were not characteristic of any of these.

Question 8

An autosomal recessivdisorder

Accepted Answer

A) requires that only one parent be a carrier. 
B) displays its symptoms only in heterozygotes. 
C) is more frequent in males than females. 
D) will appear only in children of parents who both carry the gene. 
E) is dominant in females.

Question 9

When two alleles of thsamgenardifferent, thindividual carrying thosalleles is saito be

Accepted Answer

A) dominant. 
B) heterozygous. 
C) zygotes. 
D) autosomes. 
E) homozygous.

Question 10

If tall (D) is dominant to dwarf (d), antwo homozygous varieties Dandarcrossed, then what kinof progeny will bproduced?

Accepted Answer

A) all intermediate forms 
B) all tall 
C) all dwarf 
D) 1/2 tall, 1/2 dwarf 
E) 3/4 tall, 1/4 dwarf

Question 11

In a pedigrechart, a malshowing thspecific trait being studieis indicateby a

Accepted Answer

A) clear square. 
B) darkened square. 
C) clear triangle. 
D) darkened diamond. 
E) darkened circle.

Question 12

Mendel woulnot havseen four different phenotypes in thsecongeneration of his dihybricrosses if

Accepted Answer

A) the genes had been on the same chromosomes. 
B) the parent generation had been homozygous. 
C) purple had been dominant to white. 
D) more than two traits were traced. 
E) all of these were true.

Question 13

Achondroplasia is an autosomal dominant disorder.If a newly weddecouplfinds after genetic screening that they arboth heterozygous for alleles responsiblfor that genetic disorder, what is their chancto hava chilwith achondroplasia?

Accepted Answer

A) 0 percent 
B) 25 percent 
C) 50 percent 
D) 75 percent 
E) 100 percent

Question 14

Which of thfollowing genotypes is homozygous?

Accepted Answer

A) AaBB 
B) aABB 
C) aaBB 
D) aaBb 
E) AaBb

Question 15

Which of thfollowing organs arlikely to baffecteby a defectivCFTR protein?

Accepted Answer

A) lungs 
B) pancreas 
C) muscles 
D) lungs and pancreas 
E) lungs and muscles

Question 16

Amniocentesis is

Accepted Answer

A) a surgical means of repairing deformities. 
B) a form of chemotherapy that modifies or inhibits gene expression or the function of gene product. 
C) used in prenatal diagnosis to detect chromosomal mutations and genetic disorders in embryos. 
D) a form of gene replacement therapy. 
E) all of these.

Question 17

Ththeory of segregation applies morspecifically to events occurring in preparation of

Accepted Answer

A) offspring. 
B) zygotes. 
C) homologous chromosomes. 
D) gametes. 
E) loci.

Question 18

If short hair (L) is dominant to long hair (l), animals LL anLl havthsame

Accepted Answer

A) parents. 
B) genotypes. 
C) phenotypes. 
D) alleles. 
E) genes.

Question 19

Thprobability of producing a normal chilby two parents who arcarriers for an autosomal recessivdisorder is

Accepted Answer

A) 50 percent. 
B) 0 percent. 
C) 100 percent. 
D) 25 percent. 
E) 75 percent.

Question 20

Which of thfollowing is useto check for dominancrelationship between alleles of two genes?

Accepted Answer

A) heterohybrid 
B) hybrid 
C) monohybrid 
D) dihybrid 
E) homohybrid

Exam 9: Patterns of Inheritance