Question 1

If short hair (L) is dominant to long hair (l) , animals LL and Ll have the same

Accepted Answer

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

Question 2

The appearance of the chins at #3 is called the

Accepted Answer

A)  dominant allele. 
B)  genotype. 
C)  offspring. 
D)  recessive gene. 
E)  phenotype.

Question 3

Congenital deafness in humans is due to the homozygous condition of either or both of the recessive genes d or e . Both dominant D and E are necessary for normal hearing. Gene D/d affects the middle ear, while gene E/e affects the inner ear. It does not matter how good the normal inner ear (as indicated by E _) is; if there is something wrong in the middle ear, the individual is unable to hear. The same applies for the other gene. Give the phenotypic results of the following crosses: 
 (a) Dd EE x Dd EE 
 (b) Dd Ee x Dd Ee 
 (c) dd EE x DD ee 
 (d) Dd EE x Dd ee 
 (e) Dd EE x DD Ee

Accepted Answer

The answer of Congenital deafness in humans is due to...

Question 4

Each version of a gene is called a(n)

Accepted Answer

A)  allele. 
B)  chromosome. 
C)  histone. 
D)  centromere. 
E)  artifact.

Question 5

Tall ( D ) is dominant to dwarf ( d ). Give the F ₂ genotypic and phenotypic ratios of a cross between a pure-breeding, tall plant and a pure-breeding, dwarf plant.

Accepted Answer

The answer of Tall ( D ) is dominant to...

Question 6

In horses, there are four alleles at the A locus. Arranged in dominance sequence, they are: A (wild) a ^b (bay) a ^c (brown) a ^d (black) If you bred several bay mares whose sires were brown to a brown stallion whose sire was black, what type of offspring would be produced and in what proportion?

Accepted Answer

The answer of In horses, there are four alleles at...

Question 7

The wide-ranging effect of a single gene is called

Accepted Answer

A)  heterozogosity. 
B)  homozygosity. 
C)  segregation. 
D)  pleiotropy. 
E)  co-dominance.

Question 8

A locus is

Accepted Answer

A)  a recessive gene. 
B)  an unmatched allele. 
C)  a sex chromosome. 
D)  the location of a specific gene on a chromosome. 
E)  a dominant gene.

Question 9

If a child has blood type AB, he or she could NOT have been produced by which set of parents?

Accepted Answer

A)  Type A mother and type B father 
B)  Type AB mother and type O father 
C)  Type O mother and type O father 
D)  Type O mother and type AB father 
E)  Type B mother and type AB father

Question 10

The allele for albinism ( c ) is recessive to the allele for normal pigmentation ( C ). A normally pigmented woman whose father is an albino marries an albino man whose parents are normal. They have three children of which two are normal and one is albino. Give the genotypes for each person listed.

Accepted Answer

The answer of The allele for albinism ( c )...

Question 11

The probability that an individual who inherits an allele will have the phenotype associated with it is

Accepted Answer

A)  pleiotropy. 
B)  genomic imprinting. 
C)  codominance. 
D)  penetrance. 
E)  linkage.

Question 12

If all the offspring of a testcross are alike and resemble the organism being tested, then that parent is

Accepted Answer

A)  homozygous dominant. 
B)  homozygous recessive. 
C)  heterozygous. 
D)  recessive. 
E)  incompletely dominant.

Question 13

In cocker spaniels, black coat color (B) is dominant over red (b) , and solid color (S) is dominant over spotted (s) . If two black, solid dogs were crossed several times and the total offspring were eighteen black, solid and five black, spotted puppies, the genotypes of the parents would most likely be

Accepted Answer

A)  Bb Ss x Bb Ss . 
B)  Bb Ss x Bb SS . 
C)  BB Ss x Bb ss . 
D)  BB Ss x Bb Ss . 
E)  Bb ss x Bb SS .

Question 14

In sweet peas, genes C and P are necessary for colored flowers. In the absence of either (__ pp or cc __), or both ( cc pp ), the flowers are white. What will be the color of the offspring of the crosses in what proportions for the following? 
 (a) Cc Pp x cc pp 
 (b) Cc Pp x Cc Pp 
 (c) Cc PP x Cc pp 
 (d) Cc pp x cc Pp

Accepted Answer

The answer of In sweet peas, genes C and P...

Question 15

Independent assortment occurs during

Accepted Answer

A)  meiosis. 
B)  mitosis. 
C)  morphogenesis. 
D)  segregation. 
E)  cell fission.

Question 16

In radishes, two incompletely dominant genes control color and shape. Red and white radishes are homozygous, while the hybrid is purple. Long and round are homozygous and, if crossed, will produce an oval hybrid. Give the F ₂ genotypic and phenotypic ratio produced by crossing pure-breed red and long radishes with white and round varieties.

Accepted Answer

The answer of In radishes, two incompletely dominant genes control...

Question 17

In cocker spaniels, black coat color (B) is dominant over red (b) , and solid color (S) is dominant over spotted (s) . A cross of Bb Ss with bb ss would produce the phenotypic ratio

Accepted Answer

A)  9:3:3:1. 
B)  1:1:1:1. 
C)  1:2:1. 
D)  3:1. 
E)  2:2.

Question 18

In cocker spaniels, black coat color (B) is dominant over red (b) , and solid color (S) is dominant over spotted (s) . If two dihybrids (Bb Ss) were crossed, what fraction of the black, solid offspring would be homozygous?

Accepted Answer

A)  4/16 
B)  9/16 
C)  1/9 
D)  3/16 
E)  3/4

Question 19

In cocker spaniels, black coat color (B) is dominant over red (b) , and solid color (S) is dominant over spotted (s) . If two dihybrids (Bb Ss) were crossed, which would be produced?

Accepted Answer

A)  black and spotted pure-breeding forms 
B)  black and solid pure-breeding forms 
C)  red and solid pure-breeding forms 
D)  red and spotted pure-breeding forms 
E)  all of these

Question 20

In sweet peas, genes C and P are necessary for colored flowers. In the absence of either (__  pp or cc  __), or both ( cc pp ), the flowers are white. Give the probable genotype of a plant with colored flowers and a plant with white flowers that produced 38 plants with colored flowers and 42 plants with white flowers.

Accepted Answer