Monohybrid and Dihybrid Crosses
Biology ⇒ Genetics and Heredity
Monohybrid and Dihybrid Crosses starts at 9 and continues till grade 12.
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Describe the difference between dominant and recessive alleles.
Explain why the 9:3:3:1 ratio is not always observed in dihybrid crosses.
If a homozygous dominant plant (TT) is crossed with a homozygous recessive plant (tt), what will be the genotype of the F1 generation?
If a monohybrid cross between two heterozygous individuals results in 100 offspring, how many are expected to show the recessive phenotype?
If a parent has genotype AaBb, list all possible gametes it can produce.
If a pea plant with genotype RrYy is crossed with another RrYy plant, what is the probability of getting an offspring with genotype RRYY?
If a plant with genotype Aa is crossed with a plant with genotype aa, what percentage of the offspring will be heterozygous?
If a plant with genotype Tt is crossed with another Tt plant, what are the possible genotypes of the offspring?
Which of the following best describes Mendel’s Law of Segregation?
(1) Each allele pair separates independently during gamete formation
(2) Each pair of alleles segregates during gamete formation
(3) Genes are inherited together
(4) Only dominant alleles are expressed
Which of the following best explains the Law of Independent Assortment?
(1) Alleles of different genes assort independently during gamete formation
(2) Alleles of the same gene separate during gamete formation
(3) Only dominant alleles are inherited
(4) Genes are always inherited together
Which of the following genotypes is heterozygous?
(1) AA
(2) aa
(3) Aa
(4) aA
Which of the following is a phenotype?
(1) Aa
(2) Tall
(3) Tt
(4) tt
Fill in the blank: In a dihybrid cross, the number of possible gamete combinations from a parent with genotype AaBb is ______.
Fill in the blank: The alternative forms of a gene are called ______.
Fill in the blank: The cross between an individual with unknown genotype and a homozygous recessive individual 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: A monohybrid cross can be used to study the inheritance of two traits at the same time.
True or False: In a dihybrid cross, the F1 generation is always heterozygous for both traits if both parents are homozygous for different alleles.
True or False: In a dihybrid cross, the phenotypic ratio 9:3:3:1 is only observed if the genes are unlinked.
True or False: In a monohybrid cross, the F1 generation is always heterozygous if both parents are homozygous for different alleles.
