1. Joe\'s second toe is much longer than his thumb toe. T his isa re cessive tra

Question

1. Joe's second toe is much longer than his thumb toe. T his isa re cessive trait. If he marries Mary, who is a heterozygous for having her second toe shorter than her thumb toe, answer the following questions. Use the letter T to represent this allele.TS r se cund toe a. Which trait is dominant -long second toe or short second toe? hor Se b. What are Joe and Mary 's genotypes? c. If Joe and Mary have children, what are the possibilities of their children's phenotype? 2 0 perevt chanoe o t habh d. What are the possibilities of their children's genotype tyees a oes

Explanation / Answer

a. Since it longer second toe is a recessive trait therefore the dominat trait is short second toe.

b. Joe carries a long second toe which is a recessive trait therefore his genottype is tt while Mary being a heterozygoous with dominant trait will have the genotype Tt. Here T denotes small second toe and is dominant over t which represents longer second toe.

c. If they have children the 50% will have longer second toe (tt) and another 50% will have shorter second toe (Tt).

d. The onses with shorter second toe will be hetrerozygoys for the trait with genotype Tt and the ones with longer second toe will be homozygous recessive with the genotype tt.

T t t Tt tt t Tt tt

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