In chickens, comb shape is determined by alleles at two loci (R, r and P,p). A walnut comb is produced when at least one dominant allele R ispresent at one locus and at least one dominant allele P is present at asecond locus (genotype R_ P_). A rose comb is produced when at leastone dominant allele is present at the first locus and two recessive allelesare present at the second locus (genotype R_ pp). A pea comb isproduced when two recessive alleles are present at the first locus and atleast one dominant allele is present at the second (genotype rr P_). Iftwo recessive alleles are present at the first and at the second locus (rrpp), a single comb is produced. Progeny with what types of combs andin what proportions will result from the following crosses? a. RR PP × rr pp b. Rr Pp × rr pp c. Rr Pp × Rr Pp d. Rr pp × Rr pp e. Rr pp × rr Pp f. Rr pp × rr pp

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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.