In poultry, two independently assorting genes together determine the structure of the comb. Thus, when R is the only dominant allele present, the fowl possesses a rose comb; when P is only dominant allele present, a ‘pea’ comb is produced; when both dominants are present, a ‘walnut’ comb is produced; when only the recessive alleles are present, a ‘single’ comb is obtained. (a) What are the possible genotypes of all the phenotypes obtainable? Determine the genotype of the parent birds in the following crosses: (b) Rose x walnut produced 3/8 walnut, 3/8 rose, 1/8 rose, 1/8 pea and 1/8 single offspring. (c) Walnut x single produced ¼ walnut and ¼ pea, ¼ rose and ¼ single offspring (d) Rose x pea produced 6 walnut and 5 rose offspring.

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Inheritance and Mendelian Genetics

Inheritance means the passing of traits to offspring from parents. These traits could be passed either through asexual reproduction or sexual reproduction. The offspring receives the genetic material from the parents. Mendelian inheritance is a certain biological inheritance that follows the rules and principles laid down by Gregor Mendel in 1865. The initial hypothesis was considered wrong, but other inheritance theories modified the concept of inheritance and thus genetics.