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Questions and Answers
Mendelian inheritance is characterized by a phenotypic ratio of 1 RR : 2 RW : 1 ______
Mendelian inheritance is characterized by a phenotypic ratio of 1 RR : 2 RW : 1 ______
WW
In codominance, both alleles are ______ expressed in the phenotype.
In codominance, both alleles are ______ expressed in the phenotype.
fully
Tabby cats demonstrate the ______ phenomenon between tan and black fur.
Tabby cats demonstrate the ______ phenomenon between tan and black fur.
codominance
A man with type AB blood cannot have an AB child with a woman who has type ______ blood.
A man with type AB blood cannot have an AB child with a woman who has type ______ blood.
The ______ are the specific combinations of alleles that determine an organism's traits.
The ______ are the specific combinations of alleles that determine an organism's traits.
When considering multiple alleles, more than ______ types of alleles can be present for a single trait.
When considering multiple alleles, more than ______ types of alleles can be present for a single trait.
The possible blood types from a cross of a heterozygous A type and a homozygous B type parent include ______, B, and AB.
The possible blood types from a cross of a heterozygous A type and a homozygous B type parent include ______, B, and AB.
The coat color in rabbits is determined by multiple ______ including Agouti, Chinchilla, Himalayan, and Albino.
The coat color in rabbits is determined by multiple ______ including Agouti, Chinchilla, Himalayan, and Albino.
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Study Notes
Mendelian vs Non-Mendelian Inheritance
- Mendelian inheritance follows simple dominant and recessive patterns.
- Non-Mendelian inheritance can include multiple alleles, codominance, and incomplete dominance.
Examples of Non-Mendelian Traits
- Codominance can be observed in traits like fur color in tabby cats, demonstrating equal expression of both alleles.
- In a RR : RW : WW ratio, red and white traits illustrate a phenotypic ratio of 1 RED : 2 PINK : 1 WHITE.
Codominance in Genetics
- Choose a gene letter and assign unique letters as superscripts for different alleles.
- Tan and black fur in tabby cats exemplifies codominance, producing a mixed phenotype.
Practice Scenarios
- For a cross between a tabby and a black cat, analyze expected phenotypic ratios.
- The offspring count of 36 tabbies and 40 black cats implies the parental phenotypes are tabby and black, further determining genotypes.
Multiple Alleles
- More than two alleles can result in various expressed phenotypes for a given trait.
- Blood type genetics illustrate multiple alleles with implications for compatibility in blood donation (e.g., A blood cannot be donated to B blood).
Blood Type Inheritance Examples
- Heterozygous A type crossed with homozygous B type can yield offspring with possibilities for A, B blood types.
- In an AB and O blood type scenario, children may have blood types A, B, or O; the O type child is adopted.
Paternity and Blood Type Analysis
- An AB man cannot have an AB child with an O woman due to incompatible allele combinations.
- A child with type B blood can have parents with possible blood types of B, O, or A.
Coat Color in Rabbits
- Multiple allele traits in rabbits include agouti, chinchilla, Himalayan, and albino colors.
- The offspring from a cross between an agouti (Ccch) and a chinchilla (cchch) can be analyzed to determine genotype and phenotype ratios.
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