a Punnett square for this cross. How many offspring would be predicted to have terminal flowers and be dwarf? (See Table 14.1.) 1. According to the law of independent assortment‚ 25 plants (1⁄16 of the offspring) are predicted to be aatt‚ or recessive for both characters. The actual result is likely to differ slightly from this value. A–13 2. List all gametes that could be made by a pea plant heterozygous for seed color‚ seed shape‚ and pod shape (YyRrIi; see Table 14.1). How large a Punnett
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mutant genes of vestigial wings and curved wings in Drosophila. Results Part A Cross A (wildtype females X curly males) Male Female Wild type 1 2 Curly wing 0 1 Table 1. The number of the phenotypes and sex of offspring of the Cross A Cross B (curly females X curly males) Male Female Wild type 2 1 Curly wing 3 0 Table 2. The number of the phenotypes and sex of offspring of the Cross A 2. The cross A and B look like sex-linked traits‚ but it is not sex-linked dominant curly
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Abstract A gene can be defines as the basic physical unit of heredity; a linear sequence of nucleotides along a segment of DNA that provides the coded instructions for synthesis of RNA‚ which‚ when translated into protein‚ leads to the expression of hereditary character. An allele is a any of several forms of a gene‚ usually arising through mutation‚ that are responsible for hereditary variation. Our experiment was formed to study the allele frequency in a single trait caused by a single gene. We conducted
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offspring of plants. He showed that certain factors‚ now known as genes‚ affected
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of which is a recessive characteristic and the other dominant. Mendel said that factors‚ later called genes‚ normally occur in pairs in ordinary body cells‚ yet segregate during the formation of sex cells. Each member of the pair becomes part of the separate sex cell. The dominant gene‚ such as the purple flower in Mendel’s plants‚ will hide the recessive gene‚ the white flower. After Mendel self-fertilized the F1 generation and obtained the 3:1 ratio‚ he correctly theorized that genes can be paired
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report is about one which was carried out using these very creatures as a test subject and three of Mendel’s propositions (“Characteristics are determined by genes which have two versions (alleles)‚ a normal allele and a mutant allele”. “The normal allele is dominant and the mutant allele is recessive in each case”. “Each fly carries two of these genes but only passes one to each of the offspring‚ at random”.) as the basis of research. Introduction The Drosophila flies are a sex linked species which
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Mendel’s work and Genetics Dominant – expression that is always expressed when its gene recessive - An expression that is expressed only when its allele is the only form of the gene present in the genotype. incomplete dominance - Neither allele is dominant to the other‚ thus each is expressed in the heterozygous genotype producing an intermediate phenotype. EX. Red (RR) and White (R’R’) snapdragons produce pink (RR’). epistasis - A condition in which one gene pair has the ability to mask
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matings between different pea plants.| c.|it is possible to obtain large numbers of progeny from any given cross.| d.|peas have an unusually long generation time.| e.|many of the observable characters that vary in pea plants are controlled by single genes.| ____ 2. What is the difference between a monohybrid cross and a dihybrid cross? a.|A monohybrid cross involves a single parent‚ whereas a dihybrid cross involves two parents.| b.|A monohybrid cross produces a single progeny‚ whereas a dihybrid
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to identify a parent in that the blood type can prove that a person is not the parent of a child rather than determine without question who the parent is. A‚ B‚ AB and O blood groups are the result of three alleles. Allele A and B are co-dominant and O is recessive to both A and B. Should the discrepancy continue‚ tissue typing and DNA fingerprinting will be used. Read through the following information and answer the questions below: In a maternity ward of a hospital‚ two newly born babies were mixed
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versions of the same gene and one may be dominant to the other. –TRUE 2. In a dihybrid cross of a mother and father who are both heterozygous dominant for chin fissures and dimples‚ what would be the phenotypic ratio of chin fissures and dimples in their offspring? –-9:3:3:1 3. If two alleles are heterozygous‚ it means they are the same allele. --FALSE 4. If the letter ""C"" stands for the dominant allele for having a chin fissue and the letter ""c"" stands for the recessive allele for smooth chin
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