Biology

82. In pea plants, yellow is a dominant trait and green is a recessive trait. In a genetic cross of two plants that are heterozygous for the pea color trait, what percent of the offspring should have yellow peas?

A. 100%

B. 75%

C. 50%

D. 25%

83. Advantages to using the garden pea for Mendel’s experiments included all listed below except

A. True-breeding varieties were scarce.

B. He could expect to observe segregation of traits among the offspring.

C. They have relatively short generation time.

D. Sex organs of the pea are enclosed within the flower.

84. Pea plants can

A. Self-pollinate, but are not self-compatible

B. Self-fertilize

C. Only cross-fertilize

D. Reproduce without pollination

85. When Mendel crossed pure-breeding purple and white flowered pea plants, the dominant to recessive ratio in the F1generation was

A. 3:1

B. 4:0

C. 4:1

D. 4:0

E. 9:3:3:1

86. On which of the following chromosomes are sex-linked traits carried?

A. 13

B. 18

C. Y

D.15

E. X

87. The genotype of an individual with Turner syndrome is

A. YO

B. XXY

C. XYY

D. XO

88. In Mendel’s F2 generation, one out of four plants had white flowers because

A. The trait is sex-linked

B. Both parents were heterozygous purple

C. One parent was homozygous recessive

D. Both parents were heterozygous white

89. In Mendel’s F2 generation of the purple and white flower crossing, the dominant to recessive ratio was

A. 1:3:1

B. 3:1

C. 1:1

D. 9:7

E. 9:3:3:1

90. The appearance resulting from a given gene combination is referred to as the

A. Genotype

B. Phenotype

C. Phototype

E. Stereotype

91. A individual who has two of the same allele is said to be

A. Homozygous

B. Heteromologous

C. Homologous

D. Heterozygous

E. Diplozygous

92. Which of the following represents a dihybrid?

A. WWSs

B. WwSS

C. WwSs

D. WWss

E. wwSs

93.Where two alternatives for a trait are tall and short, and tall is dominant, the genotype of a heterozygous individual would be expressed

A. sS

B. ss

C. SS

D. Ss

E. tall

94. The two alternatives for a trait are red and white and red is dominant. However, white is the most common trait. What is the genotype of a homozygous dominant individual?

A. RR

B. rr

C. WW

D. ww

E. red

95. In garden peas, height is determined by a single gene with tall being dominate to short. If two heterozygous plants are crossed, what proportion of the tall progeny will be homozygous dominant?

A. 3/4

B. 2/3

C. 1/2

D. 1/3

E. 1/4

96. The model for the dihybrid cross of heterozygotes predicts a phenotypic ratio of 9:3:3:1.

A. True

B. False

97. A trait caused by a recessive autosomal allele will result in a pedigree that shows affected individuals having at least one affected parent.

A) True

B) False

98 One gene can have multiple effects on an organism.

A. True

B. False

99. Down syndrome results from:

A. The absence of one chromosome in position 21

B. The presence of an extra chromosome in position 21

C. The absence of both chromosomes in position 21

D. Crossing over on the chromosomes in position 21

E. None of the above

100. Which of the following is not a result of nondisjunction of the sex chromosomes?

A. Down syndrome

B. Barr body

C. Turner syndrome

D. Klinefelter syndrome

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