Hypothesis What is your hypothesis for the genetic characteristics (e.g. dominant/recessive, autosomal/sex-linked, etc.) of the traits you have chosen to study? What observations lead you to make this hypothesis? What phenotypes and phenotypic ratio would you predict for the offspring (the first generation, or F1 generation) of this cross? What genotypes and genotypic ratio would you predict? How did you come to this prediction? Write your explanation as a hypothesis to the experiment you are doing. Enter your answers here. Solution Hypothesis: A cross between pure breeding dominant and recessive genotypes obtain all dominant phenotypes in the F1 generation. Presence of criss cross inheritance confirms the sex linkage of the trait while same proportion of affected son and daughter is the indicator of autosomal inheritance. Dominant trait is expressed in both homozygous and heterozygous genotype while the recessive trait is expressed in homozygous genotype only. Sex linked traits exhibit criss cross inheritance (father to daughter and mother to son). The cross( for dominant/recesive)= TT x tt= Tt Phenotype- all tall Genotype= all Heterozygous (Tt) The cross (for autosomal/sex linked)= XcY (affected father) x XX (normal mother)= XcX (normal but carrier daughters): XY (normal sons)..

1. Hypothesis What is your hypothesis for the genetic characteristics (e.g. dominant/recessive,
autosomal/sex-linked, etc.) of the traits you have chosen to study? What observations lead you to
make this hypothesis? What phenotypes and phenotypic ratio would you predict for the offspring
(the first generation, or F1 generation) of this cross? What genotypes and genotypic ratio would
you predict? How did you come to this prediction? Write your explanation as a hypothesis to the
experiment you are doing. Enter your answers here.
Solution
Hypothesis: A cross between pure breeding dominant and recessive genotypes obtain all
dominant phenotypes in the F1 generation.
Presence of criss cross inheritance confirms the sex linkage of the trait while same proportion of
affected son and daughter is the indicator of autosomal inheritance.
Dominant trait is expressed in both homozygous and heterozygous genotype while the recessive
trait is expressed in homozygous genotype only. Sex linked traits exhibit criss cross inheritance
(father to daughter and mother to son).
The cross( for dominant/recesive)= TT x tt= Tt
Phenotype- all tall
Genotype= all Heterozygous (Tt)
The cross (for autosomal/sex linked)= XcY (affected father) x XX (normal mother)= XcX
(normal but carrier daughters): XY (normal sons).