How to breed Single Comb gamecock strain?

A Pure Single Comb Gamecock Strain

Let us focus on the genetic inheritance of the two most common gamecock comb types.

  1. Single Comb Type
  2. Pea Comb Type

Pea Comb Type Genes vs Single Comb Type Genes:

  1. PEA comb type allele, P (uppercase P), is DOMINANT to SINGLE comb type allele.
    • to manifest physically, only one allele is needed
  2. SINGLE comb type allele, p (lowercase p), is RECESSIVE to PEA comb type allele.
    • to manifest physically, two alleles are needed

The Dominant-Recessive Trait Relationship above dictate phenotype expression and genotype inheritance.

  1. PP
    • homozygous (pure) pea comb
  2. Pp (or pP)
    • heterozygous (impure) pea comb
    • pea comb physically (but with single comb hidden gene that might be inherited by its offsprings)
  3. pp
    • homozygous (pure) single comb

Hence,

  1. SINGLE comb is:
    • ALWAYS homozygous (pure) single comb
  2. PEA comb can be either:
    • homozygous (pure) pea comb
    • heterozygous (impure) pea comb

 SINGLE COMB

  • has two alleles of single comb type in its comb gene loci
  • its parents are both single combs
    • parent #1 and #2 = pp = single comb
    • 100% offsprings = pp = single comb
  • its parents can be a single comb + an heterozygous (impure) pea comb
    • parent #1 = pp = single comb
    • parent #2 = Pp (or pP) = heterozygous (impure) pea comb
    • 50% offsprings = pp = single comb
  • its parents are both heterozygous (impure) pea combs
    • parent #1 and #2 = Pp (or pP) = heterozygous (impure) pea comb
    • 25% offsprings = pp = single comb

100% offsprings are single comb

These matings will produce 100% single comb offsprings.

  • parent #1 and #2 = pp = single comb
  • 100% offsprings = pp = single comb
  • pp x pp = pp, pp, pp, pp
  • Punnet Square
    p p
    p pp pp
    p pp pp

50% offsprings are single comb

These matings will produce 50% single comb offsprings and 50% heterozygous (impure) pea comb offsprings.

  • parent #1 = pp = single comb
  • parent #2 = Pp (or pP) = heterozygous (impure) pea comb
  • 50% offsprings = pp = single comb
  • 50% offsprings = Pp (or pP) = heterozygous (impure) pea comb
  • pp x Pp = pP, pp, pP, pp
  • Punnet Square
    P p
    p pP pp
    p pP pp

25% offsprings are single comb

These matings will produce 25% single comb offsprings, 50% heterozygous (impure) pea comb offsprings, and 25% homozygous (pure) pea comb offsprings.

  • parent #1 and #2 = Pp (or pP) = heterozygous (impure) pea comb
  • 25% offsprings = pp = single comb
  • 50% offsprings = Pp (or pP) = heterozygous (impure) pea comb
  • 25% offsprings = PP = homozygous (pure) pea comb
  • Pp x Pp = PP, Pp, pP, pp
  • Punnet Square
    P p
    P PP Pp
    p pP pp

PROGENY TESTING FOR PEA COMB TYPE

Pea Comb Type Progeny Testing is the process to know the comb genetic make up of an individual thru observations of its offsprings from different mating partners with single comb type and pea comb type (preferably partners that have been comb type progeny tested in the past or those previously qualified as homogenous pea comb or heterogenous pea comb).

Remember, a homozygous (pure) pea comb will NEVER produce “directly” a single comb offspring ever EVEN when mated to a single comb.

  • parent #1 = PP = homozygous (pure) pea comb
  • parent #2 = pp = single comb
  • 100% offsprings = Pp (or pP) = heterozygous (impure) pea comb
  • PP x pp = Pp, Pp, Pp, Pp
  • Punnet Square
    p p
    P Pp Pp
    P Pp Pp

Summary

Formal Genetic Notation

Poultry genetic books have uppercase P for pea comb and lowercase p for single comb.

  • PP for homozygous (pure) pea comb
  • Pp (or pP) for heterozygous (impure) pea comb
  • pp for single comb

Uppercase denotes dominant trait (pea comb).

Lowercase denotes recessive trait (single comb).

Matings:

  • PP x PP = PP, PP, PP, PP
  • PP x Pp = PP, Pp, PP, Pp
  • PP x pp = Pp, Pp, Pp, Pp
  • Pp x pp = Pp, Pp, pp, pp
  • pp x pp = pp, pp, pp, pp
  • Pp x pP = Pp, PP, pp, pP

Simplified Genetic Notation

To be easy for the eyes, let us change lowercase p to uppercase S.

  • PP for homozygous (pure) pea comb
  • PS (or SP) for heterozygous (impure) pea comb
  • SS for single comb

Matings:

  • PP x PP = PP, PP, PP, PP
  • PP x PS = PP, PS, PP, PS
  • PP x SS = PS, PS, PS, PS
  • PS x SS = PS, PS, SS, SS
  • SS x SS = SS, SS, SS, SS
  • PS x SP = PS, PP, SS, SP
A Pure Single Comb Gamecock Strain




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