Monohybrid and Dihybrid Crosses
Biology ⇒ Genetics and Heredity
Monohybrid and Dihybrid Crosses starts at 9 and continues till grade 12.
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A pea plant with genotype TtYy is crossed with a plant with genotype ttyy. What is the probability of getting a tall plant with yellow seeds?
A plant with genotype TtYy is crossed with a plant with genotype Ttyy. What is the probability of getting a tall plant with green seeds?
Describe what is meant by a test cross.
Explain the difference between genotype and phenotype.
Explain why Mendel chose pea plants for his genetic experiments.
Explain why the 9:3:3:1 ratio is observed in the F2 generation of a dihybrid cross.
If a monohybrid cross is performed between a homozygous dominant and a homozygous recessive individual, what will be the genotype of the F1 generation?
If a pea plant with genotype Tt is crossed with a plant with genotype tt, what percentage of the offspring will be tall?
In Mendel’s experiments, what traits did he study in his dihybrid cross? (1) Seed color and seed shape (2) Flower color and plant height (3) Pod color and pod shape (4) Leaf color and stem thickness
Which of the following best describes a dihybrid cross? (1) A cross involving one trait (2) A cross involving two traits (3) A cross involving three traits (4) A cross involving four traits
Which of the following best represents the Law of Independent Assortment? (1) Alleles of different genes are inherited together (2) Alleles of different genes are inherited independently (3) All alleles are dominant (4) All alleles are recessive
Which of the following is a possible phenotype in the F2 generation of a dihybrid cross between RrYy × RrYy? (1) Round yellow (2) Round green (3) Wrinkled yellow (4) All of the above
Fill in the blank: In a dihybrid cross, the alleles of different genes assort ________ of each other.
Fill in the blank: The alternative forms of a gene are called ________.
Fill in the blank: The cross between two individuals differing in only one trait is called a ________ cross.
Fill in the blank: The cross between two individuals that are heterozygous for two traits is called a ________ cross.
True or False: In a dihybrid cross, the F1 generation will always show the dominant phenotype for both traits if both parents are homozygous for opposite alleles.
True or False: In a dihybrid cross, the genes for different traits assort independently if they are on different chromosomes.
True or False: In a monohybrid cross, the F2 generation always shows a 1:2:1 genotypic ratio.
True or False: In a monohybrid cross, the recessive trait disappears in the F1 generation but reappears in the F2 generation.
