Exercises: Other patterns of inheritance
Explain what codominance is and give a human example in which two alleles are expressed simultaneously.
Explain what codominance is and give a human example in which two alleles are expressed simultaneously.
Explain what incomplete dominance is and describe which phenotype appears when crossing a red-flowered plant with a white-flowered plant if the trait follows this…
Explain what incomplete dominance is and describe which phenotype appears when crossing a red-flowered plant with a white-flowered plant if the trait follows this pattern.
Explain the difference between codominance and incomplete dominance, and give an example of each one.
Explain the difference between codominance and incomplete dominance, and give an example of each one.
Explain what it means for a gene to be linked to the X chromosome and explain why males (XY) have only one allele for those genes, while females (XX) have two.
Explain what it means for a gene to be linked to the X chromosome and explain why males (XY) have only one allele for those genes, while females (XX) have two.
A person has blood type O. State their genotype and explain whether they can have any $I^A$ or $I^B$ allele.
A person has blood type O. State their genotype and explain whether they can have any $I^A$ or $I^B$ allele.
For the ABO blood groups there are three different alleles, but each person only has two of them. Explain what multiple allelism is and why this happens.
For the ABO blood groups there are three different alleles, but each person only has two of them. Explain what multiple allelism is and why this happens.
In the four o'clock plant, flower color shows incomplete dominance: RR is red, Rr is pink and rr is white. Cross a pink-flowered plant with a white-flowered one and…
In the four o'clock plant, flower color shows incomplete dominance: RR is red, Rr is pink and rr is white. Cross a pink-flowered plant with a white-flowered one and state the genotypic and phenotypic ratios of the offspring.
In four o'clock plants, flower color shows incomplete dominance: red (RR), pink (Rr) and white (rr). Complete the Punnett square in the diagram, where two pink-flowered…
In four o'clock plants, flower color shows incomplete dominance: red (RR), pink (Rr) and white (rr). Complete the Punnett square in the diagram, where two pink-flowered plants are crossed, and state the genotypic and phenotypic ratios of the offspring.
In humans, sex is determined chromosomally: females are XX and males are XY. Explain, using the corresponding cross, why the probability of having a son or a daughter is…
In humans, sex is determined chromosomally: females are XX and males are XY. Explain, using the corresponding cross, why the probability of having a son or a daughter is equal (1:1 ratio) and which parent provides the chromosome that determines the sex of the offspring.
In Andalusian hens, plumage color shows incomplete dominance: BB is black, Bb is blue and bb is white. Cross two blue hens and state the expected genotypic and…
In Andalusian hens, plumage color shows incomplete dominance: BB is black, Bb is blue and bb is white. Cross two blue hens and state the expected genotypic and phenotypic ratios in the chicks.
A color-blind man ($X^d Y$) has children with a woman with normal vision who is not a carrier ($X^D X^D$). State the genotypes and phenotypes of the sons and of the…
A color-blind man ($X^d Y$) has children with a woman with normal vision who is not a carrier ($X^D X^D$). State the genotypes and phenotypes of the sons and of the daughters, and explain why this type of inheritance is said to go "criss-cross" from fathers to daughters.