14. In maize, the recessive genes su and sh (when homozygous) produce sugary and
ID: 282197 • Letter: 1
Question
14. In maize, the recessive genes su and sh (when homozygous) produce sugary and shrunken endosperm, respectively. Their dominant alleles Su and Sh produce normal starchy and full endosperm. A true breeding sugary variety is crossed to a pure breeding shrunken variety.
In this cross, what is the genotype and the phenotype of the F1 generation? (2 pt)
Diagram the TEST CROSS of this F1, and indicate both the GENOTYPE and PHENOTYPE of the progeny. Please use a Punnett Square to diagram this cross. (3 pt)
I know that the parental cross is susuShSh x SuSushsh, which yields all SusuShsh (all starchy an full). I need help with the test cross part. Thanks!!
Explanation / Answer
Answer:
True breeding sugary variety (susu ShSh) x pure breeding shrunken variety (SuSu shsh)---Parents
Susu Shsh (Normal starchy & Full endosperm)-----------------------------------------------------F1
Susu Shsh (F1) x susu shsh(tester)-------------------------------Testcross
su sh
Su Sh
Su Sh / su sh (normal starchy & Full endosperm)
Su sh
Su sh / su sh (normal starchy & shrunken endosperm)
su Sh
su Sh / su sh (sugary & full endosperm)
su sh
su sh / su sh (sugary & shrunken endosperm)
su sh
Su Sh
Su Sh / su sh (normal starchy & Full endosperm)
Su sh
Su sh / su sh (normal starchy & shrunken endosperm)
su Sh
su Sh / su sh (sugary & full endosperm)
su sh
su sh / su sh (sugary & shrunken endosperm)
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.