In certain plant species such as tomatoes and petunias, a highly polymorphic incompatibility gene S with more than 100 known alleles prevents self-fertilization and promotes outbreeding. In this form of incompatibility, a plant cannot accept sperm carrying an allele identical to either of its own incompatibility alleles. If, for example, pollen carrying sperm with allele sI of the incompatibility gene lands onto the stigma (a female organ) of a plant that also carries the st allele, the sperm cannot fertilize any eggs in that plant. (This phenomenon occurs because the pollen grain on the stigma cannot grow a pollen tube to allow the sperm to unite with the egg.) For the following crosses, indicate whether any progeny would be produced, and if so, list all possible genotypes of these progeny. a. 8 s'5x 9 s's? b. ¿s'sx95353 d. Explain how this mechanism of incompatibility would prevent plant self- fertilization. e. How does this incompatibility system ensure F. How do you know that peas are not governed by this incompatibility mechanism? g. Explain why evolution would favor the emergence of new incompatibility alleles, making the gene increasingly polymorphic in populations of tomatoes or petunias. Pls helps asap!!
In certain plant species such as tomatoes and petunias, a highly polymorphic incompatibility gene S with more than 100 known alleles prevents self-fertilization and promotes outbreeding. In this form of incompatibility, a plant cannot accept sperm carrying an allele identical to either of its own incompatibility alleles. If, for example, pollen carrying sperm with allele sI of the incompatibility gene lands onto the stigma (a female organ) of a plant that also carries the st allele, the sperm cannot fertilize any eggs in that plant. (This phenomenon occurs because the pollen grain on the stigma cannot grow a pollen tube to allow the sperm to unite with the egg.) For the following crosses, indicate whether any progeny would be produced, and if so, list all possible genotypes of these progeny. a. 8 s'5x 9 s's? b. ¿s'sx95353 d. Explain how this mechanism of incompatibility would prevent plant self- fertilization. e. How does this incompatibility system ensure F. How do you know that peas are not governed by this incompatibility mechanism? g. Explain why evolution would favor the emergence of new incompatibility alleles, making the gene increasingly polymorphic in populations of tomatoes or petunias. Pls helps asap!!
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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Question
In certain plant species such as tomatoes and
petunias, a highly polymorphic incompatibility
gene S with more than 100 known alleles
prevents self-fertilization and promotes
outbreeding. In this form of incompatibility, a
plant cannot accept sperm carrying an allele
identical to either of its own incompatibility
alleles. If, for example, pollen carrying sperm
with allele sI of the incompatibility gene lands
onto the stigma (a female organ) of a plant
that also carries the st allele, the sperm
cannot fertilize any eggs in that plant. (This
phenomenon occurs because the pollen grain
on the stigma cannot grow a pollen tube to
allow the sperm to unite with the egg.)
For the following crosses, indicate whether any
progeny would be produced, and if so, list all
possible genotypes of these progeny.
a. 8 s'5x 9 s's?
b. ¿s'sx95353
d. Explain how this mechanism of
incompatibility would prevent plant self-
fertilization.
e. How does this incompatibility system ensure
F. How do you know that peas are not
governed by this incompatibility
mechanism?
g. Explain why evolution would favor the
emergence of new incompatibility alleles,
making the gene increasingly polymorphic
in populations of tomatoes or petunias.
Pls helps asap!!
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