No. Parents with the dominant phenotype might be heterozygous in their genotype. This means they could carry both the dominant and recessive allele for a trait. So they could both pass the recessive allele to an offspring, who would then have the homozygous recessive genotype and recessive phenotype.
If the phenotype is recessive then the genotype must be dd.
A recessive phenotype is expressed in an offspring that has a homozygous recessive genotype for that trait.
They produce TTGG, TTGg, TTgg, ttGG, ttGg, ttgg, TtGG, TtGg, Ttgg offspring. Phenotype ratios will be: 9 dominant phenotype for both traits 3 dominant phenotype for T and recessive phenotype for g. 3 dominant phenotype for G and recessive phenotype for t. 1 recessive phenotype/genotype for both traits.
You would expect 1 homozygous dominant, 2 heterozygous dominant and 1 homozygous recessive offspring. This is because each parent has one dominant and one recessive allele. Therefore there is a 75% chance of a dominant phenotype and a 25% chance of a recessive phenotype.
because it dominates the phenotype
Given those conditions, the offspring have a 50% chance of demonstrating the dominant phenotype and a 50% chance of demonstrating the recessive phenotype.
If the phenotype is recessive then the genotype must be dd.
100 percent.
The homozygous dominant individual can only pass on the dominant allele and the homozygous recessive individual can only pass on the recessive allele, therefore all offspring will be heterozygous and have the dominant phenotype.
A recessive phenotype is expressed in an offspring that has a homozygous recessive genotype for that trait.
They produce TTGG, TTGg, TTgg, ttGG, ttGg, ttgg, TtGG, TtGg, Ttgg offspring. Phenotype ratios will be: 9 dominant phenotype for both traits 3 dominant phenotype for T and recessive phenotype for g. 3 dominant phenotype for G and recessive phenotype for t. 1 recessive phenotype/genotype for both traits.
A living thing with a dominant and a recessive gene for a trait is heterozygous. This individual will display the dominant phenotype for that trait but may have offspring that display the recessive trait.
Don't give us the options then!! If one parent had 2 dominant genes then all offspring would have dominant phenotype, the same goes for both parents having dominant genes.
Mutation occurs, if a mutation is recessive it is not expressed in the phenotype, if however it is dominant when passed on in the offspring it is expressed in the phenotype.
Genotype is the coded for traitPhenotype is the visible characteristicSo in the case where both parents had heterozygous dominant Brown eyes (Bb - big B for brown, dominant gene; little b for blue recessive gene); it is possible for the child to have blue eyes, by being homozygous recessive (bb).However this is an educated guess, as your question does not make sense.
If both parents have the same phenotype, but the offspring did not share that phenotype, then it is likely that the parents have a dominant phenotype, but the offspring has a recessive phenotype, which means that the offpring's genotype would be homozygous recessive, and it's parents' genotypes would be heterozygous. For example, the parents may both have the genotype Bb, which gives them black fur. Approximately 25% of their offspring should have the genotype bb, which gives them the phenotype of white fur.
If both parents have the same phenotype, but the offspring did not share that phenotype, then it is likely that the parents have a dominant phenotype, but the offspring has a recessive phenotype, which means that the offpring's genotype would be homozygous recessive, and it's parents' genotypes would be heterozygous. For example, the parents may both have the genotype Bb, which gives them black fur. Approximately 25% of their offspring should have the genotype bb, which gives them the phenotype of white fur.