To produce pea plants that only display the recessive phenotype of a trait, what must be the genotypes of the parent plants?

1 Answer
Dec 7, 2016

The parent plants must only contain the recessive genotype.

Explanation:

If a parent contained a dominant genotype, at least some of its offspring would display the dominant phenotype.

#T TxxT T rarr {T T, T T, T T, T T}#
#T T xx T t rarr {T T, T T, T t, T t}#
#T T xx t t rarr { T t, T t, T T, T t}#
#T t xx T T rarr {T T, T T, t T, r T}#
#T t xx T t rarr {T T, T t, t T, t t}#
#T t xx T T rarr {T T, T T, t T, t T}#
#t t xx T T rarr {t T, t T, t T, t T}#
#t t xx T t rarr { t T, t t, t T, t t}#
#color(blue)(t t xx t t rarr {t t, t t, t t,t t})#

For the recessive trait to be displayed in the phenotype for all offspring, their genotypes must contain only the recessive gene (they must be #color(blue)(t t)#) .