Genetically Speaking

(continued)

Punnett Squares for different genetic combinations.

Single recessive crosses using normal ball pythons, (wild type), heterozygous albino ball pythons and albino ball pythons.

Normal x Albino

a⁺a⁺ x aa

In this cross all the resulting offspring are heterozygous for albino, a⁺a.

Normal x Heterozygous albino

a⁺a⁺ x a⁺a

In this cross there is a mixture of offspring. 50% of the hatchlings are normal or wild type, a⁺a⁺. 50% of the hatchlings are heterozygous albinos, a⁺a. Since there are no visual differences between the hatchlings that are heterozygous albinos and the normals the entire clutch is labeled 50% possible heterozygous albinos.

Heterozygous albino x Heterozygous albino

a⁺a x a⁺a

In this cross there is a mixture of offspring. 25% of the hatchlings are normal or wild type, a⁺a⁺. 50% of the hatchlings are heterozygous albinos, a⁺a. 25% of the hatchlings are albino, aa. Since there are no visual differences between the hatchlings that are heterozygous albinos and the normals the normal looking ball pythons are labeled 66% possible heterozygous albinos.

Heterozygous albino x Albino

a⁺a x aa

In this cross there is also a mixture of offspring. 50% of the hatchlings are heterozygous albino, a⁺a. 50% of the hatchlings are albinos, aa.

Double recessive crosses using albino ball pythons and axanthic ball pythons.

Albino x Axanthic

aaax⁺ax⁺ x a⁺a⁺axax

In this cross all the resulting offspring are double heterozygous for albino and axanthic, a⁺aax⁺ax.

Double heterozygous albino axanthic x Double heterozygous albino axanthic

a⁺aax⁺ax x a⁺aax⁺ax

Punnett Squares for different genetic combinations.

Single recessive crosses using normal ball pythons, (wild type), heterozygous albino ball pythons and albino ball pythons.

Double heterozygous albino axanthic x albino heterozygous axanthic

a⁺aax⁺ax x aaax⁺ax

In this cross 12.5% of the offspring are heterozygous for albino a⁺aax⁺ax⁺, 25% of the offspring are heterozygous for albino and heterozygous for axanthic a⁺aax⁺ax, 12.5% of the offspring are axanthic heterozygous for albino a⁺aaxax, 12.5% of the offspring are albino aaax⁺ax⁺, 25% of the offspring are albino heterozygous axanthic aaax⁺ax, 12.5% of the offspring are snow aaaxax.

Double heterozygous albino axanthic x snow

a⁺aax⁺ax x aaaxax

In this cross 25% of the offspring are heterozygous for albino and heterozygous for axanthic a⁺aax⁺ax, 25% of the offspring are axanthic heterozygous for albino a⁺aaxax, 25% of the offspring are albino heterozygous axanthic aaax⁺ax, 25% of the offspring are snow aaaxax.

Albino heterozygous axanthic x snow

aaax⁺ax x aaaxax

In this cross 50% of the offspring are albino heterozygous for axanthic aaax⁺ax and 50% of the offspring are snow aaaxax.