Galeopsis tetrahit G. pubescens G. speciosa (a) Chromosomal compostion of 3 Galeopsis specles Fertile Infertile Infertile G. tetrahit x G. tetrahit G. tetrahit x G. pubescens G. tetrahit x G. speciosa (b) Outcome of Intraspecles and Interspecles crosses FIGURE 29.4 A comparison of crosses bet ween three natural species of hemp nettle that vary in the number of chromosome sets. (a) Galeopsis tetrahit is an allotetraploid that is thought to be derived from Galeopsis pubescens and Galeopsis speciosa. (b) If G. tetrahit is crossed with either of the other two species, the F, hybrid offspring will be monoploid for one chromosome set and diploid for the other. The F, offspring are likely to be sterile, because they will produce highly aneuploid gametes.

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
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A technique called fluorescence in situ hybridization (FISH) is described. In this method, a labeled piece of DNA is hybridized to a set of chromosomes. Let’s suppose that you cloned a piece of DNA from G. pubescens and used it as a labeled probe for in situ hybridization. What would you expect to happen if this DNA probe were hybridized to the G. speciosa or G. tetrahit chromosomes? Describe the expected results.

Galeopsis tetrahit
G. pubescens
G. speciosa
(a) Chromosomal compostion of 3 Galeopsis specles
Fertile
Infertile
Infertile
G. tetrahit x G. tetrahit
G. tetrahit x G. pubescens
G. tetrahit x G. speciosa
(b) Outcome of Intraspecles and Interspecles crosses
FIGURE 29.4 A comparison of crosses bet ween three natural species of hemp nettle that vary in the number of chromosome sets.
(a) Galeopsis tetrahit is an allotetraploid that is thought to be derived from Galeopsis pubescens and Galeopsis speciosa. (b) If G. tetrahit is crossed with
either of the other two species, the F, hybrid offspring will be monoploid for one chromosome set and diploid for the other. The F, offspring are likely to
be sterile, because they will produce highly aneuploid gametes.
Transcribed Image Text:Galeopsis tetrahit G. pubescens G. speciosa (a) Chromosomal compostion of 3 Galeopsis specles Fertile Infertile Infertile G. tetrahit x G. tetrahit G. tetrahit x G. pubescens G. tetrahit x G. speciosa (b) Outcome of Intraspecles and Interspecles crosses FIGURE 29.4 A comparison of crosses bet ween three natural species of hemp nettle that vary in the number of chromosome sets. (a) Galeopsis tetrahit is an allotetraploid that is thought to be derived from Galeopsis pubescens and Galeopsis speciosa. (b) If G. tetrahit is crossed with either of the other two species, the F, hybrid offspring will be monoploid for one chromosome set and diploid for the other. The F, offspring are likely to be sterile, because they will produce highly aneuploid gametes.
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