AP Biology-patterns of inheritance?

[precious0818]

In certain breeds of sheep, yellow-fatted individuals appear from time to time. These sheep lack the enzyme that breaks down the yellow colored xanthophyll pigments in the grass the sheep eat. This yellow fat occurs in individuals homozygous for the recessive gene (w). Yellow-fatted sheep are not as marketable as white-fatted sheep and bring a lower price.

1)If you were a sheep rancher and you found-yellow fatted sheep in your herd, what type of breeding program would you use?

2)Since there is usually only one ram per flock, what test cross would you use to find out if the male is homozygous for white fat?

3)What environmental changes could be made to overcome this genotype? In cats, black color is causes by an X linked allele; the other allele at this locus causes orange color. The heterozygote is tortoise shell What kinds of offspring would you expect from the cross of a black female and an orange male?