Follow along on Instagram: @ivansguppies
Here is the update on cross 6 in our breeding project towards fixing a white guppy color strain. This continues our set of backcrosses using the offspring from our original four females. We are slowly making progress towards understanding how to fix a single-color trait and strain.
Our starting male has an all-white phenotype (platinum White/snow white/white Moscow/Milky white strain), can we restore this trait through multiple generations by starting with only females that don’t have this trait? In this sixth cross we are run into low probabilities of seeing the phenotype we want but they do show up nonetheless.
Some Definitions:
Gene: Unit of heredity which is transferred from a parent to offspring and may determine some characteristic of the offspring.
Allele: one of two or more alternative forms of a gene found at the same place on a chromosome.
Autosome: One of the numbered chromosomes, as opposed to the sex chromosomes.
Phenotype: the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment. This is the physical appearance of the fish in our context.
Genotype: The combinations of genetic codes that are responsible for the observable. Typically, two alleles (one from each parent) in the context of our guppies.
Homozygous: A guppy that has inherited two identical alleles for the same gene.
Heterozygous: A guppy that has inherited two different alleles for the same gene.
Relevant genes:
Magenta: Alan Bias’s Incompletely Dominant Source (swordtailguppies.blogspot.com...)
Stoerzbach (Metallicus) (See discussion on Magenta and Stoerzbach in cross 5 part 2 video: • Understanding the Gupp... )
European Blau (See discussion on Asian Blau and Hellblau in cross 5 part 1 video: • Guppy Breeding Project... )
Half black (Tuxedo/Nigrocaudatus I or II, See discussion on this gene in cross 4 video: • Crossbreeding a Half-B... )
Citation to the chart listing guppy genes:
Bias, Alan & Groenewegen, Carl. (2016). Poecilia reticulata: Domestic Breeder Trait Matrix Reference Guide. www.academia.edu/29928596/Poe....
Helpful webpages with half-black information:
1. www.emeraldking-aquatics.com/...
2. www.rudiesreflekties.be/HowTo...
Helpful book about guppy genetics:
- The Guppy Color Bank by Philip Shaddock
0:00 Introduction
0:51 For Those That Are New
1:30 Cross 6 Recap
2:37 Expected Probabilities and Predictions
10:27 Resultant Offspring
14:00 Wrapping Up
14:25 Outro and Other Cross Updates
Music:
Sneaky Snooper by Audionautix is licensed under a Creative Commons Attribution 4.0 license. creativecommons.org/licenses/...
Artist: audionautix.com/
#GuppyBreeding #ColorGenetics #fishkeepingjourney #GuppyCrossbreeding
Cross: 0006 2
SCAU: 909
21 июл 2024
