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Science
10th
grade
Mastery of Mendelian Genetics and Monohybrid Crosses
15 questions
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- 1. Multiple Choice
In a monohybrid cross between two heterozygous pea plants (Tt), what is the probability of obtaining a pea plant with tall stems (dominant trait)?
25%
50%
75%
100%
- 2. Multiple Choice
Which term describes the physical appearance of an organism as a result of its genotype?
Karyotype
Phenotype
Genotype
Allele
- 3. Multiple Choice
In a monohybrid cross, if the genotype of the offspring is "Aa", what are the possible genotypes of the parents?
AA and aa
Aa and Aa
AA and AA
aa and aa
- 4. Multiple Choice
What is the expected genotypic ratio from a monohybrid cross between two heterozygous individuals (Aa x Aa)?
1:2:1
3:1
9:3:3:1
1:1
- 5. Multiple Choice
Which of the following is NOT a principle of Mendelian Genetics?
Law of Segregation
Law of Independent Assortment
Law of Dominance
Law of Polygenic Inheritance
- 6. Multiple Choice
What is the term for the genetic makeup of an organism?
Phenotype
Genotype
Homozygous
Heterozygous
- 7. Multiple Choice
If a plant with genotype Tt is crossed with a plant with genotype tt, what percentage of the offspring will have the recessive phenotype?
0%
25%
50%
100%
- 8. Multiple Choice
What is the expected phenotypic ratio from a monohybrid cross between two heterozygous individuals (Tt x Tt) for a trait with complete dominance?
1:2:1
3:1
9:3:3:1
1:1
- 9. Multiple Choice
In the context of Mendelian genetics, what does the term "homozygous" refer to?
An organism with two different alleles for a trait
An organism with two identical alleles for a trait
The physical appearance of an organism
A cross between two different species
- 10. Multiple Choice
Which of the following genotypes is heterozygous?
AA
Aa
aa
AAA
- 11. Multiple Choice
In a monohybrid cross, what is the probability of an offspring being homozygous recessive if both parents are heterozygous?
25%
50%
75%
100%
- 12. Multiple Choice
What is the term used to describe a pair of alleles where one is dominant and the other is recessive?
Homozygous dominant
Homozygous recessive
Heterozygous
Codominant
- 13. Multiple Choice
Which of the following is an example of a phenotype?
The alleles for eye color
The sequence of DNA
Blue eyes
The presence of a recessive gene
- 14. Multiple Choice
In pea plants, the allele for yellow seeds (Y) is dominant over the allele for green seeds (y). What is the expected phenotypic ratio of the offspring from a cross between a homozygous dominant (YY) and a homozygous recessive (yy) parent?
All yellow seeds
All green seeds
3 yellow seeds : 1 green seed
1 yellow seed : 3 green seeds
- 15. Multiple Choice
Gregor Mendel's law of segregation states that:
Each individual has two alleles for each gene, which segregate during meiosis, resulting in gametes carrying only one allele for a trait.
Alleles for different genes usually segregate independently of one another.
The traits of an offspring are a blend of the parents' traits.
Dominant alleles will always be expressed in the phenotype.
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