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Questions and Answers
In a dihybrid cross, how many traits are involved simultaneously?
In snapdragons, what is the phenotype of the heterozygote for flower color?
What type of inheritance results in a heterozygote showing both traits equally?
Where are X-linked traits located?
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What is the phenotype of a roan cattle?
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Which type of cross involves genetic crosses for two traits?
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In a dihybrid cross, how many different allele combinations can be produced in the offspring?
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What is the phenotype of the offspring when two white snapdragons are crossed?
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What does incomplete dominance mean?
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What is the result of a test cross?
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Where are Y-linked traits located?
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What is the result of genetic crosses involving two traits simultaneously?
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In X-linked recessive trait, if the mother is a carrier, what is the chance of her sons being affected?
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For an X-linked recessive trait, if the dad is affected and the mum is not a carrier, what is the chance of his daughters and sons to be affected?
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In X-linked dominant trait, if the mother is the carrier of a gene, what is the chance of her sons being affected?
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For an X-linked dominant trait, if the father is the carrier of a gene, what is the chance of his sons being affected?
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In ABO blood typing, which alleles are codominant to each other?
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In ABO blood typing, which blood type indicates the presence of both sugars A and B?
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In DNA fingerprinting, what is the basis for identifying individuals?
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What is the expected percentage of this couple's children to have type AB blood?
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What is the immune response when a person receives blood with an antigen that their plasma contains the antibody for?
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What is the chance of a mother passing an X-linked recessive trait to her daughters?
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In DNA fingerprinting, what should be found in the child's bands?
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In ABO blood typing, which blood type is universal donor?
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Study Notes
Dihybrid Cross
- A dihybrid cross involves two traits simultaneously.
- In a dihybrid cross, 2^4 = 16 different allele combinations can be produced in the offspring.
Inheritance Patterns
- Incomplete dominance results in a heterozygote showing both traits equally.
- Codominance occurs when two alleles are equally expressed, as seen in ABO blood typing.
Flower Color in Snapdragons
- The phenotype of the heterozygote for flower color in snapdragons is a blending of the two colors.
X-Linked Traits
- X-linked traits are located on the X chromosome.
- In an X-linked recessive trait, if the mother is a carrier, there is a 50% chance of her sons being affected.
- In an X-linked recessive trait, if the dad is affected and the mum is not a carrier, all daughters will be carriers and none of the sons will be affected.
- In an X-linked dominant trait, if the mother is the carrier of a gene, all sons will be affected.
- In an X-linked dominant trait, if the father is the carrier of a gene, none of the sons will be affected.
ABO Blood Typing
- ABO blood typing involves codominant alleles.
- The presence of both sugars A and B indicates type AB blood.
- Type O blood is the universal donor.
DNA Fingerprinting
- DNA fingerprinting is based on identifying individuals through unique DNA patterns.
- A child's DNA bands should contain a combination of their parents' bands.
Blood Type Inheritance
- The expected percentage of a couple's children to have type AB blood depends on the genotypes of the parents.
- If a person receives blood with an antigen that their plasma contains the antibody for, an immune response will occur.
- A mother has a 50% chance of passing an X-linked recessive trait to her daughters.
Roan Cattle
- Roan cattle have a mixture of two colors, resulting from incomplete dominance.
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Description
Test your understanding of complex patterns of inheritance with this quiz on dihybrid crosses. Explore how genetic crosses involving two traits simultaneously, such as seed color and shape, demonstrate Mendel's principles of inheritance. Practice using Punnett squares to predict the outcomes of these complex genetic crosses.
