00:01
All right, so erminette fowls have mostly light colored feathers with an occasional black one giving a flecked appearance.
00:05
Crossup two erminets produced a total 48 progeny consisting of 22 erminets, 14 blacks, and 12 pure whites.
00:12
What genetic basis of the erminette pattern is suggested and how as you test your hypothesis.
00:18
So to start with using what we know, erminant fowls, they show a co -dominate feature between the two alleles.
00:40
Co -dominance refers to a condition where the species exhibits both alleles, exhibits both alleles, that are expressed equally, and neither of them is neither dominant nor recessive.
01:15
So the genotypes and the corresponding phenotypes will look like b -b for the genotype, and that's black, and then we have bw, which is white and black, and then we have ww being white.
01:43
So the pure white crosses will give rise to the progeny that are all white and similarly pure black parenals will result in a pure black progeny.
01:52
As the feature is a codominate one, there cannot be a proper estimate of phenotypes of the offspring that have a mixed genotype.
01:59
This is because the two alleles of the gene pair expressed independently in the heterozygous condition and produce different gene products or different phenotype.
02:06
So essentially, if we can test our hypothesis by making theoretical crosses using punnet squares.
02:14
So if we say, let's say if we crossed a black permanent with a white one, pure white, and pure black, we'll get all black and white progeny...