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Unusual phenotypes are caused by the Ds transposable element GENOTYPES PHENOTYPES (a) Chromosome breakage Wx Ds c sh WX Colorless (c) Shrunken (sh) Not shiny (wx) Ac-activated chromosome breakage at Ds Pigmented (C) Plump (Sh) Shiny (Wx) Acentric fragment is lost. Ds- Sh Wx c sh WX (b) New unstable alleles c-Ds Sh Wx c sh WX Colorless background Ac activates Ds loss from C gene. Ds c Sh Wx c sh WX FIGURE 15-3 New phenotypes in corn are produced through the movement of the Ds transposable element on chromosome 9. (a) A chromosome fragment is lost through breakage at the Ds locus. Recessive alleles on the homologous chromosome are expressed, producing the colorless sector in the kernel. (b) Insertion of Ds in the C gene (top) creates colorless corn-kernel cells. Excision of Ds from the C gene through the action of Ac in cells and their mitotic descendants allows color to be expressed again, producing the spotted phenotype.

Unusual phenotypes are caused by the Ds transposable element GENOTYPES PHENOTYPES (a) Chromosome breakage Wx Ds c sh WX Colorless (c) Shrunken (sh) Not shiny (wx) Ac-activated chromosome breakage at Ds Pigmented (C) Plump (Sh) Shiny (Wx) Acentric fragment is lost. Ds- Sh Wx c sh WX (b) New unstable alleles c-Ds Sh Wx c sh WX Colorless background Ac activates Ds loss from C gene. Ds c Sh Wx c sh WX FIGURE 15-3 New phenotypes in corn are produced through the movement of the Ds transposable element on chromosome 9. (a) A chromosome fragment is lost through breakage at the Ds locus. Recessive alleles on the homologous chromosome are expressed, producing the colorless sector in the kernel. (b) Insertion of Ds in the C gene (top) creates colorless corn-kernel cells. Excision of Ds from the C gene through the action of Ac in cells and their mitotic descendants allows color to be expressed again, producing the spotted phenotype.

Human Anatomy & Physiology (11th Edition)
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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In Figure 15-3a, what would the kernel phenotype be if
the strain were homozygous for all dominant markers on
chromosome 9?

Unusual phenotypes are caused by the Ds transposable element GENOTYPES PHENOTYPES (a) Chromosome breakage Wx Ds c sh WX Colorless (c) Shrunken (sh) Not shiny (wx) Ac-activated chromosome breakage at Ds Pigmented (C) Plump (Sh) Shiny (Wx) Acentric fragment is lost. Ds- Sh Wx c sh WX (b) New unstable alleles c-Ds Sh Wx c sh WX Colorless background Ac activates Ds loss from C gene. Ds c Sh Wx c sh WX FIGURE 15-3 New phenotypes in corn are produced through the movement of the Ds transposable element on chromosome 9. (a) A chromosome fragment is lost through breakage at the Ds locus. Recessive alleles on the homologous chromosome are expressed, producing the colorless sector in the kernel. (b) Insertion of Ds in the C gene (top) creates colorless corn-kernel cells. Excision of Ds from the C gene through the action of Ac in cells and their mitotic descendants allows color to be expressed again, producing the spotted phenotype.
Transcribed Image Text:Unusual phenotypes are caused by the Ds transposable element GENOTYPES PHENOTYPES (a) Chromosome breakage Wx Ds c sh WX Colorless (c) Shrunken (sh) Not shiny (wx) Ac-activated chromosome breakage at Ds Pigmented (C) Plump (Sh) Shiny (Wx) Acentric fragment is lost. Ds- Sh Wx c sh WX (b) New unstable alleles c-Ds Sh Wx c sh WX Colorless background Ac activates Ds loss from C gene. Ds c Sh Wx c sh WX FIGURE 15-3 New phenotypes in corn are produced through the movement of the Ds transposable element on chromosome 9. (a) A chromosome fragment is lost through breakage at the Ds locus. Recessive alleles on the homologous chromosome are expressed, producing the colorless sector in the kernel. (b) Insertion of Ds in the C gene (top) creates colorless corn-kernel cells. Excision of Ds from the C gene through the action of Ac in cells and their mitotic descendants allows color to be expressed again, producing the spotted phenotype.
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