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 monohybrid cross between two heterozygous individuals results in what percentage of homozygous recessive offspring?
A monohybrid cross between two heterozygous tall pea plants (Tt x Tt) results in what percentage of short plants?
A pea plant with genotype RrYy is crossed with a plant with genotype rryy. What is the expected phenotypic ratio in the offspring?
A pea plant with genotype RrYy is crossed with another plant with genotype RrYy. What is the probability of obtaining an offspring with genotype rryy?
Describe the process of setting up a Punnett square for a dihybrid cross.
A plant with genotype AaBb is test-crossed with aabb. If the two genes are located on different chromosomes, what is the expected phenotypic ratio among the offspring?
A researcher crosses two pea plants, one with genotype RrYy and the other with genotype rryy. If the genes are completely linked, what phenotypic ratio is expected in the offspring?
In a dihybrid cross between two individuals with genotypes AaBb and AaBb, if the genes are linked and show 20% recombination, what percentage of the offspring are expected to have parental phenotypes?
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 explains why the 9:3:3:1 ratio is not always observed in dihybrid crosses?
(1) Genes are always linked
(2) Genes may be linked on the same chromosome
(3) Only dominant alleles are expressed
(4) Only recessive alleles are expressed
Which of the following genotypes represents a dihybrid individual?
(1) RR
(2) RrYy
(3) rr
(4) YY
Which of the following is an example of a test cross?
(1) Crossing two homozygous dominant individuals
(2) Crossing a heterozygous individual with a homozygous recessive individual
(3) Crossing two heterozygous individuals
(4) Crossing two homozygous recessive individuals
Fill in the blank: In a dihybrid cross, the alleles of different genes assort ________ of each other during gamete formation.
Fill in the blank: In a dihybrid cross, the F1 generation is always ________ for both traits if both parents are homozygous for different alleles.
Fill in the blank: In a monohybrid cross, the allele that is masked in the F1 generation is called the ________ allele.
Fill in the blank: The F1 generation in a monohybrid cross between two homozygous parents will all be ________ for the trait.
True or False: A dihybrid cross can be used to study the inheritance of two traits simultaneously.
True or False: In a dihybrid cross, the genes for the two traits must be located on different chromosomes for independent assortment to occur.
True or False: In a monohybrid cross, the F2 generation shows a phenotypic ratio of 3:1.
True or False: Incomplete dominance can be observed in a monohybrid cross.
