Which option shows all allele combinations that can be used to represent a purebred animal?(1 point)
Responses
TT or tt
Tt
tt
TT or Tt
TT or tt
To determine which option shows all allele combinations that can be used to represent a purebred animal, we need to understand the concept of purebred animals and how their alleles are represented.
A purebred animal is an individual that has two identical alleles for a specific trait, meaning both alleles are either dominant or recessive. In this case, let's refer to the trait as "T", where the uppercase "T" represents the dominant allele and the lowercase "t" represents the recessive allele.
Option 1: TT or tt
This option suggests that a purebred animal can have either two dominant alleles (TT) or two recessive alleles (tt). This is correct since purebred animals will have a homozygous genotype, meaning both alleles are the same.
Option 2: Tt
This option suggests that a purebred animal can have one dominant allele (T) and one recessive allele (t). This is incorrect because a purebred animal must have both alleles being the same (homozygous).
Option 3: tt
This option suggests that a purebred animal can have two recessive alleles (tt). This is correct since purebred animals can have a homozygous recessive genotype.
Option 4: TT or Tt
This option suggests that a purebred animal can have either two dominant alleles (TT) or one dominant allele and one recessive allele (Tt). This is incorrect because a true purebred animal will have a homozygous genotype, meaning both alleles are the same.
Therefore, the correct option that shows all allele combinations that can be used to represent a purebred animal is option 1: TT or tt.
The option that shows all allele combinations that can be used to represent a purebred animal is:
TT or tt.