The number of fingers and toes a person has on their hands and feet is an inherited human characteristic. When the gene for polydactyly (extra fingers and toes) is present, the gene for the "normal" number of fingers and toes (5) is completely masked. ("F" and "f" will be used to represent the different forms of this gene)
1. A person that has a genotype of "Ff" is said to be _______________.
2. Which phenotype of the above-mentioned characteristic is dominant?
Answer the following question using the information below.
In pea plants, tall plant size is completely dominant over short plant size.
Using "T" and "t" to represent the alleles of this gene, what is the genotype of a homozygous short pea plant? ________________
Using "T" and "t" to represent the alleles of this gene, what is the genotype for a heterozygous tall pea plant? _______________
What would the genotype(s) be of the gametes produced by the plant in question 2 (think meiosis)? _____________
What percentage of the gametes produced by the plant in question 3 would have the short allele? (think meiosis) _______________
If the plant from question 2 were crossed with the plant from section 3, what proportion of the offspring will be short? (You may wish to use a Punnett square to determine your answer.) _____________
3. What is the phenotype of a person exhibiting the recessive form of this characteristic?
4. Using "F" and "f", give the genotype of a person who has five fingers on each hand and five toes on each foot.