Podcast
Questions and Answers
In a scenario exhibiting codominance, what phenotypic outcome is observed in offspring?
In a scenario exhibiting codominance, what phenotypic outcome is observed in offspring?
- The recessive allele masks the expression of the dominant allele.
- Only the dominant allele's trait is expressed.
- The phenotype displays an intermediate blend of both alleles.
- Both alleles' traits are distinctly and simultaneously expressed. (correct)
Which condition is characterized by the absence of a dominant or recessive relationship between alleles?
Which condition is characterized by the absence of a dominant or recessive relationship between alleles?
- Polygenic inheritance
- Codominance (correct)
- Incomplete dominance
- Sex-linked inheritance
How does the expression of multiple alleles for a single characteristic differ from simple Mendelian inheritance?
How does the expression of multiple alleles for a single characteristic differ from simple Mendelian inheritance?
- Multiple alleles display complete dominance, while Mendelian inheritance shows incomplete dominance.
- Multiple alleles result in only two possible phenotypes, while Mendelian inheritance results in multiple phenotypes.
- Multiple alleles only affect sex-linked traits, while Mendelian inheritance affects autosomal traits.
- Multiple alleles involve more than two possible alleles for a trait, while Mendelian inheritance typically involves only two alleles. (correct)
What genetic phenomenon is exemplified by the ABO blood type system in humans?
What genetic phenomenon is exemplified by the ABO blood type system in humans?
Why are sex-linked traits more frequently observed in one sex compared to the other?
Why are sex-linked traits more frequently observed in one sex compared to the other?
How does the inheritance pattern of sex-linked traits differ from that of autosomal traits?
How does the inheritance pattern of sex-linked traits differ from that of autosomal traits?
Which of the following statements correctly describes the nature of sex-linked traits concerning inheritance?
Which of the following statements correctly describes the nature of sex-linked traits concerning inheritance?
Why are sex-linked traits often associated with recessive disorders or diseases?
Why are sex-linked traits often associated with recessive disorders or diseases?
A plant species exhibits codominance for flower color, where $R$ represents the allele for red petals and $W$ represents the allele for white petals. What would be the expected phenotype of a plant with the genotype $RW$?
A plant species exhibits codominance for flower color, where $R$ represents the allele for red petals and $W$ represents the allele for white petals. What would be the expected phenotype of a plant with the genotype $RW$?
In a certain species of bird, the gene for feather color is sex-linked. The $X$ chromosome carries either the $B$ allele for black feathers or the $b$ allele for brown feathers. If a female bird ($X^B X^b$) is crossed with a male bird ($X^b Y$), what is the probability of producing a male offspring with brown feathers?
In a certain species of bird, the gene for feather color is sex-linked. The $X$ chromosome carries either the $B$ allele for black feathers or the $b$ allele for brown feathers. If a female bird ($X^B X^b$) is crossed with a male bird ($X^b Y$), what is the probability of producing a male offspring with brown feathers?
Flashcards
Codominance
Codominance
Form of dominance where both alleles are expressed in the phenotype.
Multiple Alleles
Multiple Alleles
Condition where there are more than two alleles for a particular gene.
Sex-linked traits
Sex-linked traits
Traits controlled by genes on sex chromosomes, often the X chromosome.
Study Notes
- Study notes on codominance, multiple alleles, and sex-linked traits are detailed below
Codominance
- A type of dominance where two alleles or traits of the genotypes (of both homozygotes) are expressed together in offspring (phenotype).
- There is neither a dominant nor recessive allele in cross-breeding.
- It is also referred to as no dominance due to the appearance of both alleles.
Multiple Alleles
- This occurs when there are more than two alleles that are possible to code for any one characteristic.
- It can also encompass incomplete dominance and codominance along with simple or complete dominance for any given characteristic.
- An example is ABO blood type, which refers to which of certain proteins called antigens are found on your red blood cells.
Sex-linked Traits
- These are found on the sex chromosomes of the species and are passed down through reproduction.
- They are seen in one sex and not the other, although both sexes are physically able to inherit a sex-linked trait.
- Sex-linked traits are not as common as other traits because they are found only on one set of chromosomes, the sex chromosomes, and they are often associated with recessive disorders or diseases.
- They are rarer and usually found only in one sex, making it difficult for the trait to be selected against by natural selection.
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