Final answer:
When an animal is heterozygous for the sex-influenced alleles Sc and sc, it will express the dominant trait, which is to have scurs on its face.
Step-by-step explanation:
In the context of scurs, which are small horn-like growths on the faces of cattle, the inheritance pattern follows sex-influenced alleles. The dominant allele, Sc, is expressed in males, while the recessive allele, sc, is expressed in females. When an animal is heterozygous for these alleles, it means it has one dominant allele (Sc) and one recessive allele (sc). In this case, the animal will express the dominant trait, which is to have scurs on its face.
A heterozygous animal (Scsc) will express the dominant trait if male and the recessive trait if female due to the sex-influenced nature of scur growth in cattle.
If an animal is heterozygous for the sex-influenced alleles Sc and sc, which control the growth of scurs in cattle, the phenotype expressed will depend on the sex of the animal. Since the trait is dominantly inherited in males and recessively in females, a heterozygous male (Scsc) will express the dominant trait and a heterozygous female (Scsc) will express the recessive trait, assuming it does not have scurs. Essentially, a heterozygous individual carries one dominant and one recessive allele, but in cases where a trait is sex-influenced, the expression of the trait will be affected by the sex of the individual.