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?
A monohybrid cross between two heterozygous individuals results in which genotypic ratio? (1) 1:1 (2) 1:2:1 (3) 3:1 (4) 9:3:3:1
Which of the following best describes Mendel’s Law of Independent Assortment? (1) Genes for different traits are inherited together. (2) Genes for different traits assort independently during gamete formation. (3) Only dominant traits are inherited. (4) Recessive traits are always masked.
Which of the following genotypes is homozygous dominant? (1) Aa (2) AA (3) aa (4) aA
Which of the following is an example of a monohybrid cross? (1) Aa × aa (2) AaBb × AaBb (3) AaBb × aabb (4) AABB × aabb
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 an individual with an unknown genotype and a homozygous recessive individual is called a _______.
Fill in the blank: The cross between two individuals differing in two traits is called a _______ cross.
True or False: In a monohybrid cross, the F1 generation always shows the dominant phenotype.
True or False: In a monohybrid cross, the F1 generation is always heterozygous.
True or False: In a monohybrid cross, the F2 generation can have individuals with the same phenotype but different genotypes.
True or False: Incomplete dominance can be observed in a monohybrid cross.
