00:01
Right, so in the dark, most dogs ' eyes reflect a yellowish green light.
00:03
However, when homozygous for a recessible allele called ruby eye, little e, the light reflected is red.
00:09
A dominant allele, big a results in black hair, while the recessive allele, little a produces a black and tan pattern when homozygous.
00:16
A black and tan female crossed to a black male produced nine pups, all black.
00:21
In the light of a flashlight, the eyes of the mother and four of her puppies shown red.
00:27
What is the genotype of the father with respect to reflectance of light, and what is the genotype with respect to coat color? so we start here.
00:36
We'll figure out the genotype of the father through just the process of elimination.
00:42
So as a homozygous ruby eye shown red, so the genotype of the eye, which reflected red light, will be little e, little e, or as the genotype of the eye which reflected yellowish green light will be either big e, big e, or big e, big e, little e.
00:58
Now the mother genotype of the eye will be little e, little e, as her eyes do reflect red light.
01:04
Now as for the father's eye, it doesn't reflect red light.
01:08
His genotype will either be big e, big e, or big e, little e.
01:12
If his genotype is big e, big e, big e, then genotype of all the puppies must be big e little e, and they produce a yellowish green light on reflection.
01:21
So at least going off that, we can tell that that won't be the genotype.
01:27
But this is not the case as the four puppies did shine red.
01:30
That was stated earlier...