In onion, male sterility is produced when the nuclear genotype is aa and the mitochondrial gene S (sterile) are present. Any other combination of nuclear genotype and mitochondrial gene (including gene F for fertile) will result in a male fertile plant. Give the genotypic ratio and the phenotypic ratio or the percentage of male sterile and male fertile offspring that will be produced in the following crosses. 1-2. Aa + S male x aa + F female 3-4. Reciprocal cross of 1-2. (Note that when we do reciprocal cross, we interchange/swap the genotypes of the parents (if there is a nuclear gene involved, you interchange the nuclear genotype as well). 5-6. Aa+S female x Aa + F male 7-8. Reciprocal cross of 5-6.
In onion, male sterility is produced when the nuclear genotype is aa and the mitochondrial gene S (sterile) are present. Any other combination of nuclear genotype and mitochondrial gene (including gene F for fertile) will result in a male fertile plant. Give the genotypic ratio and the phenotypic ratio or the percentage of male sterile and male fertile offspring that will be produced in the following crosses. 1-2. Aa + S male x aa + F female 3-4. Reciprocal cross of 1-2. (Note that when we do reciprocal cross, we interchange/swap the genotypes of the parents (if there is a nuclear gene involved, you interchange the nuclear genotype as well). 5-6. Aa+S female x Aa + F male 7-8. Reciprocal cross of 5-6.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:In onion, male sterility is produced when the
nuclear genotype is aa and the mitochondrial
gene S (sterile) are present. Any other
combination of nuclear genotype and
mitochondrial gene (including gene F for
fertile) will result in a male fertile plant. Give the
genotypic ratio and the phenotypic ratio or the
percentage of male sterile and male fertile
offspring that will be produced in the following
crosses.
1-2. Aa + S male x aa + F female
3-4. Reciprocal cross of 1-2. (Note that when
we do reciprocal cross, we interchange/swap
the genotypes of the parents (if there is a
nuclear gene involved, you interchange the
nuclear genotype as well).
5-6. Aa+S female x Aa + F male
7-8. Reciprocal cross of 5-6.
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