Mendel's Experiments
Who is known as the "Father of Genetics"?
A. Charles Darwin
B. Louis Pasteur
C. Gregor Mendel
D. Robert Hooke
C. Gregor Mendel
Which seed shape is dominant?
A. Wrinkled
B. Round
C. Oval
D. Flat
B. Round
A dominant trait is a trait that...
A. Always disappears.
B. Is expressed when present.
C. Is weaker than a recessive trait.
D. Only appears in females.
B. Is expressed when present.
Which letter usually represents the dominant allele for tall plants?
A. S
B. H
C. T
D. P
C. T
Which human trait is usually dominant?
A. Attached earlobes
B. Free earlobes
C. Blue eyes only
D. Straight hair only
B. Free earlobes
Which organism did Mendel use for his genetics experiments?
A. Corn plants
B. Fruit flies
C. Mice
D. Pea plants
D. Pea plants
Which flower color is dominant in pea plants?
A. White
B. Pink
C. Purple
D. Yellow
C. Purple
A recessive trait is expressed only when...
A. A dominant allele is present.
B. There are two recessive alleles.
C. There are three alleles.
D. The organism is male.
B. There are two recessive alleles.
What is the genotype of a hybrid tall plant?
A. TT
B. tt
C. Tt
D. TTT
C. Tt
Which human trait is usually recessive?
A. Widow's peak
B. Dimples
C. Attached earlobes
D. Straight hairline
D. Straight hairline
Why were pea plants ideal for Mendel's experiments?
A. They only reproduce once a year.
B. They have many contrasting traits and reproduce quickly.
C. They only have one trait to study.
D. They cannot self-pollinate.
B. They have many contrasting traits and reproduce quickly.
Which pair is NOT one of Mendel's contrasting traits?
A. Tall and Short
B. Purple and White flowers
C. Red and Blue flowers
D. Round and Wrinkled seeds
C. Red and Blue flowers
What is an allele?
A. A different form of a gene
B. A protein
C. A chromosome
D. A cell
A. A different form of a gene
What are the offspring of TT × tt?
A. All TT
B. All Tt
C. All tt
D. 50% TT and 50% tt
B. All Tt
Brown eyes (B) are dominant over blue eyes (b). What phenotype does Bb have?
A. Blue eyes
B. Green eyes
C. Hazel eyes
D. Brown eyes
D. Brown eyes
What is cross-pollination?
A. Pollen moves within the same flower.
B. Pollen moves from one plant to another.
C. Seeds are planted in different soils.
D. Plants reproduce without pollen.
B. Pollen moves from one plant to another.
Which pod color is dominant?
A. Yellow
B. Green
C. Brown
D. Purple
B. Green
Which genotype is homozygous recessive?
A. TT
B. Tt
C. tt
D. TTT
C. tt
What is the genotype ratio of Tt × Tt?
A. 1:1
B. 3:1
C. 1 TT : 2 Tt : 1 tt
D. All Tt
C. 1 TT : 2 Tt : 1 tt
Two parents have genotype Bb. What is the probability of a child having blue eyes (bb)?
A. 0%
B. 25%
C. 50%
D. 75%
B. 25%
What did Mendel observe in the F₁ generation after crossing purebred plants with contrasting traits?
A. Both traits appeared equally.
B. The offspring were a mixture of traits.
C. Only one trait appeared.
D. No offspring were produced.
C. Only one trait appeared.
How many pairs of contrasting traits did Mendel study?
A. 5
B. 6
C. 7
D. 8
C. 7
Why is a pea plant with genotype Tt tall?
A. It has two recessive alleles.
B. The dominant T masks the recessive t.
C. The recessive allele is stronger.
D. It has no alleles.
B. The dominant T masks the recessive t.
What is the phenotype ratio of Tt × Tt?
A. 1 Tall : 1 Short
B. 2 Tall : 2 Short
C. 3 Tall : 1 Short
D. 4 Tall : 0 Short
C. 3 Tall : 1 Short
A father has genotype Dd (dimples) and a mother has genotype dd (no dimples). What percentage of their children are expected to have dimples?
A. 0%
B. 25%
C. 50%
D. 100%
C. 50%