Gg and CyCg x CyCg. A chromosome for these plants has two sets of genes. The gene at one locus has two alleles that code for normal chlorophyll production. Dominant allele represented as G produce the green phenotype. The mutant allele‚ g‚ produces no chlorophyll producing an albino phenotype. Therefore genotypes GG and Gg phenotypically are green. When mutant allele g is homozygous for it‚ gg‚ no chlorophyll is present and the plants phenotypically are albino. Therefore an expected phenotypic ratio
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predicted phenotype of lactase persistence or lactase non-persistence of all biology 225 lab students and compare their predicted phenotype to
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in media‚ and letting them cross breed‚ we analyzed and recorded the phenotypes that were observed. The P1 flies were anesthetized then sexed by observing their phenotypes and equally distributed into the media we made for their copulation. When a sufficient amount of progeny was present in the culture bottle the P1 generation was killed. After the progeny developed in the F1generation of the sex-linked cross the phenotypes were observed and recorded. After the F1 generation of the monohybrid
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alleles: Green (G) which is dominant‚ and yellow (g) which is recessive. The skin locus also has two alleles: Scaled (S) is dominant to scaleless (s). a. What types of dragons would you use as the parental generation? b. What would be the phenotype(s) of the F1 generation dragons? c. Write out the genotypes of the F1 dragons that will be used to breed and give rise to the F2 generation. d. What gametes can be produced by the F1’s? e. What will be the expected phenotypic ratios among
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barbouri‚ suggesting that they diverged less recently (Kraus and Petranka‚ 1989). If A. barbouri diverged from A. texanum‚ the changes in phenotype could be due to either selection for small gills and large tail or selection for increased plasticity. If the different phenotypes correlate with genetic differences that directly determine tail and gill size‚ the phenotypes are genetically determined and the divergence is a
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Both of these show the distribution of phenotypes. In directional selection‚ the distribution of phenotypes forms a "bell curve." Selection against one of the extreme phenotypes causes the distribution to move in one direction or the other. An example might be plants whose flower color is determined by incomplete dominance: white‚ pink‚ or red. Pink flowers may be the average phenotype‚ but if we start to remove red flowers from the population‚ the "mean" phenotype will be shifted toward white flowers
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fruit fly. In our case if the cross was done correctly all the females should carry the uknown mutation and none of the male progeny should show the unknown phenotype. Following DC2‚ another cross‚ called Mapping cross one (MC1)‚ is then executed using a virgin unknown female with males carrying the dominant marker genes for the phenotypes yellow (y)‚ crossveinless (cv)‚ vermillion (v)‚ and forked (f). The final cross that was performed was the Mapping cross two (MC2). The MC2 was carried out
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Homework #24 (130222): Chapter 14 (due Friday 130222) Total points: 20 for Attempt on all questions ONE Concept Map: 10 points Objectives Gregor Mendel’s Discoveries 1. Explain how Mendel’s particulate mechanism differed from the blending theory of inheritance. • Blending: parents genes mixed • Particulate: parents genes still retain identity\ The blending theory was that genetic material contributed by the two parents mixes in a manner analogous to the way blue and yellow make green
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Explain the structure and inheritance of genes (15 marks) A cell’s nucleus contains chromosomes‚ which are long‚ coiled packaged and organized chromatin (molecules of DNA). Chromatin is a complex of molecules found in cells‚ consisting of DNA‚ protein and RNA. Proteins are polypeptides (a large sequence of amino acids). The chief protein component of chromatin are histones‚ which package and order the DNA into structural units called nucleosomes in order to fit in the cell‚ as well as reinforce the
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certain phenotypes in organisms to serve their purpose. An example of artificial selection can be observed in the phenotypic diversity of dogs—which are the descendants of wolves‚ otherwise known as Canis lupus. Homo sapiens‚ with the aid of artificial selection‚ have been able to produce the number of dog breeds we currently have. On the contrary‚ natural selection is the natural (absolutely no human intervention involved in the process‚ aside from indirect) culling of organisms’ phenotype based on
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