00:02
First we need to determine the genotypes of the parent genua pink pigs.
00:11
The first parent is homozygous for black color and rough coat.
00:19
So its genotype is bbrr.
00:24
The second parent has white and smooth coat.
00:28
So its genotype is bbrr.
00:32
Now offspring from this cross will have the genotype bbrr, black and rough coat.
00:43
Now we perform a test cross between the offspring and a genua pink with white and smooth coat.
00:51
The expected genotypic ratio from the test cross is 1 ratio 1, ratio 1, ratio 1 for bbrr, black rough, bbrr black smooth, bbrr white rough, bbrr white smooth.
01:10
The observed number of progeny is 24 black rough, 26 black smooth, 25 white rough and 25 white smooth.
01:21
To perform a cheese squared test we need to calculate the expected number of progeny for each phenotype.
01:28
Since the total number of offspring is 100 we expect 25 of each phenotype...
