Strain A Strain B BB bb A a Virescent Virescent F1 NOT FOR A Virescent

An Illustrated Guide To Vet Med Term
4th Edition
ISBN:9781305465763
Author:ROMICH
Publisher:ROMICH
Chapter2: Where, Why, And What
Section: Chapter Questions
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In barley, a self-fertilizing species that can be cross-fertilized, two true-breeding strains with virescent leaves occur. In strain A, the trait is caused by a cytoplasmic gene while in strain B it is by a recessive chromosomal gene. What phenotypes would you expect among the progeny, and in what proportions in each of the following? Illustrate your crosses below, indicate and the female and male parent for each cross, and write the phenotype of all the parents and offspring(s).

a. reciprocal crosses between A and B

 

Use the following gene assignments:
Strain B (recessive chromosomal gene)
B- not virescent
Strain A (trait is in Cytoplasm)
A– virescent
a - not virescent
b - virescent
Example:
Strain A
Strain B
BB
bb
X
a
A
Virescent
Virescent
F1
A
Virescent
NOT FOR SALE
Transcribed Image Text:Use the following gene assignments: Strain B (recessive chromosomal gene) B- not virescent Strain A (trait is in Cytoplasm) A– virescent a - not virescent b - virescent Example: Strain A Strain B BB bb X a A Virescent Virescent F1 A Virescent NOT FOR SALE
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