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 dihybrid cross is performed between two pea plants with genotypes RrYy and rryy. What is the expected phenotypic ratio in the offspring?
A dihybrid cross is performed between two plants with genotypes AaBb and AaBb. What is the probability that an offspring will have the genotype aabb?
A pea plant with genotype YYRR is crossed with yyrr. What will be the genotype of the F1 generation?
Describe the difference between a test cross and a back cross.
Describe the expected genotypic ratio in the F2 generation of a monohybrid cross.
Explain why Mendel chose pea plants for his genetic experiments.
Explain why the phenotypic ratio in a dihybrid cross is not always exactly 9:3:3:1 in real-life experiments.
If a dihybrid cross produces 320 offspring, how many are expected to show both recessive traits?
If a monohybrid cross between two heterozygous individuals results in 100 offspring, how many are expected to show the recessive phenotype?
If a plant with genotype AaBb is self-crossed, what fraction of the offspring will be homozygous for both dominant alleles?
If a plant with genotype Tt is crossed with another Tt plant, what fraction of the offspring will be homozygous recessive?
In a dihybrid cross between two heterozygous pea plants (RrYy × RrYy), what is the expected phenotypic ratio in the F2 generation?
In a dihybrid cross, how many different phenotypes are expected in the F2 generation if both parents are heterozygous for both traits?
In a dihybrid cross, what is the probability of obtaining an offspring that is homozygous recessive for both traits from two heterozygous parents?
What is a monohybrid cross?
What is the genotype of a test cross for a monohybrid trait?
A plant with genotype AaBb is test-crossed with aabb. If the genes A and B are 20 map units apart, what percentage of the offspring are expected to be recombinant types?
A researcher crosses two plants, one with genotype AABb and the other with genotype AaBb. What fraction of the offspring are expected to be homozygous dominant for both genes?
Describe how a test cross can be used to determine the genotype of an individual showing a dominant phenotype for two traits.
Explain how the Law of Independent Assortment can be affected by gene linkage, and describe the expected phenotypic ratios in such cases.
