Genotypic and phenotypic ratios in hair texture in dogs.

Wire hair in dogs is dominant over its recessive allele for smooth hair. A cross between heterozygous wire haired individuals produces F1 which are then test crossed. Determine from the expected progeny their phenotypic and genotypic ratios.

Codominant alleles in chicken feather color

Chickens with splashed white feathers when crossed with black feathered birds produce blue andalusian [slate blue] feathered birds. Cross between two blue andalusians produce offsprings of splashed white, blue andalusian and black in the ratio 1: 2: 1. a) What is the type of inheritance? b) Indicate the genotypes for each phenotype mentioned.

Blood transfusion from a sickle cell trait individual

A normal person receives blood transfusion from an individual having sickle cell trait. Will this transfusion affect the recipient? Why / why not?

Penetrance in abnormality of eye in flies

A series of crosses in a controlled environment in which all progeny were known to carry a dominant autosomal gene A that causes eye abnormality produced 600 normal flies and 1400 abnormal flies. What is the penetrance of this gene A in this particular experiment?

Mathematical formula for determining probability of a homozygous recessive progeny

By using what mathematical expression can you determine the probability of a completely homozygous recessive progeny resulting from selfing a plant heterozygous for n genes. Consider all genes to exhibit complete dominance.