1. In corn, male sterility is controlled by maternal cytoplasmic elements. This phenotype renders the male part of corn plants (i.e. the tassel) unable to produce fertile pollen; the female parts, however, remain receptive to pollination by pollen from male- fertile corn plants. However, the presence of a nuclear fertility restorer gene F restores fertility to male-sterile lines. Using the following color-coded circles, simulate the crosses indicated below. Put the illustrations of crosses in the spaces provided. Be sure to include in the labels the genotypes and phenotypes of the offspring in each cross. Big light green circle cytoplasm Big orange circle cytoplasm Small orange circle Small half-light green-half-orange circle - Ff nucleus Small light-green circle - male-sterile - male-fertile - FF nucleus - ff nucleus a. Male-sterile female x FF male (the term male-sterile is an adjective that describes the female) b. Male-sterile female x Ff male (the term male-sterile is an adjective that describes the female)
1. In corn, male sterility is controlled by maternal cytoplasmic elements. This phenotype renders the male part of corn plants (i.e. the tassel) unable to produce fertile pollen; the female parts, however, remain receptive to pollination by pollen from male- fertile corn plants. However, the presence of a nuclear fertility restorer gene F restores fertility to male-sterile lines. Using the following color-coded circles, simulate the crosses indicated below. Put the illustrations of crosses in the spaces provided. Be sure to include in the labels the genotypes and phenotypes of the offspring in each cross. Big light green circle cytoplasm Big orange circle cytoplasm Small orange circle Small half-light green-half-orange circle - Ff nucleus Small light-green circle - male-sterile - male-fertile - FF nucleus - ff nucleus a. Male-sterile female x FF male (the term male-sterile is an adjective that describes the female) b. Male-sterile female x Ff male (the term male-sterile is an adjective that describes the female)
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:1. In corn, male sterility is controlled by maternal cytoplasmic
elements. This phenotype renders the male part of corn plants
(i.e. the tassel) unable to produce fertile pollen; the female parts,
however, remain receptive to pollination by pollen from male-
fertile corn plants. However, the presence of a nuclear fertility
restorer gene F restores fertility to male-sterile lines.
Using the following color-coded circles, simulate the crosses
indicated below. Put the illustrations of crosses in the spaces
provided. Be sure to include in the labels the genotypes and
phenotypes of the offspring in each cross.
Big light green circle
cytoplasm
Big orange circle
cytoplasm
Small orange circle
Small half-light green-half-orange circle - Ff nucleus
Small light-green circle
- male-sterile
- male-fertile
- FF nucleus
- ff nucleus
a. Male-sterile female x FF male (the term male-sterile is an
adjective that describes the female)
b. Male-sterile female x Ff male (the term male-sterile is an
adjective that describes the female)
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