1. Given that $AA$ is homozygous dominant (purple flower) and $aa$ is homozygous recessive (white flower), what is the phenotype of the heterozygote $Aa$?
- A. Purple
- B. White
- C. Pink
- D. Indeterminable
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Mendelian Genetics - Practice Quiz
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Given that AA is homozygous dominant (purple flower) and aa is homozygous recessive (white flower), what is the phenotype of the heterozygote Aa?
Mendelian Genetics - Practice Quiz - Quiz Questions
Test your understanding of the Law of Segregation, genotypes, phenotypes, and statistical probability with these exercises.
2. Mendel's Law of Segregation states that during gamete formation, a heterozygote $Aa$:
- A. Produces only $A$ gametes
- B. Produces only $a$ gametes
- C. Produces both $A$ and $a$ gametes in roughly a $1:1$ ratio
- D. Fuses $A$ and $a$ gametes together
3. In a cross between two heterozygous parents ($Aa \times Aa$), what is the theoretical probability of obtaining an $aa$ genotype?
- A. 100%
- B. 75%
- C. 50%
- D. 25%
4. True or False: In a real experiment, if you observe only 10 offspring, the ratio might deviate from $3:1$; but if you observe 1000, it will be very close to $3:1$.
- True
- False
5. To determine if a purple pea plant is genotype $AA$ or $Aa$, it should be crossed with a white pea plant. This method is called a:
- A. Self-cross
- B. Hybrid-cross
- C. Test-cross
- D. Reciprocal-cross
6. When crossing two homozygotes $AA$ and $aa$, what is the genotype of the first filial generation (F1)?
- A. AA
- B. Aa
- C. aa
- D. Both AA and aa
7. In a Mendelian monohybrid cross ($Aa \times Aa$), which of the following is NOT a prerequisite for the $3:1$ phenotype ratio?
- A. The dominant allele is completely dominant over the recessive one
- B. Gametes combine randomly during fertilization
- C. The number of offspring is sufficiently large
- D. The experiment must be conducted in an indoor lab
8. Which of the following is NOT an advantage of using pea plants as a model organism for genetics?
- A. They are strictly self-pollinating and easy to obtain purebreds
- B. They have many pairs of easy-to-distinguish contrasting traits
- C. They have a short reproduction cycle and produce many offspring
- D. They can reproduce via spores in water
9. If an $Aa \times Aa$ cross produces $200$ offspring, approximately how many individuals would theoretically show the recessive phenotype (white flowers)?
- A. $25$
- B. $50$
- C. $100$
- D. $150$