"Allele" Essays and Research Papers

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  • chapter 10 bio. outline

    Punnett square is a tool which charts the possible combinations of alleles in offspring from two parents. Test crosses can be performed to determine whether dominant phenotypes are heterozygous or homozygous. Mendel formed his law of segregation from this work. Today we know that many traits are controlled by dominant and recessive alleles of genes. Genes have a specific location called the gene locus. Genotype describes the actual alleles for a gene; phenotype is the physical expression of the genotype

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  • PCB 3063: Study Guide

    b. If one of the rough F1 animals is mated to its rough parent‚ what progeny would you expect? This would be a monohybrid cross: Rr x Rr => 1/4 RR‚ 1/2 Rr‚ 1/4 rr. 4. In maize‚ a dominant allele A is necessary for seed color‚ as opposed to colorless (a). Another gene has a recessive allele w that results in waxy starch‚ as opposed to normal starch (W). The two genes segregate independently. What are the phenotypes and relative frequencies of offspring from each of the following crosses

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  • Genteic

    hides) the other. To get purple flowers one must have both C and P alleles present. Explanation: In genetics‚ epistasis is a phenomenon in which the expression of one gene depends on the presence of one or more "modifier genes." A gene whose phenotype is expressed is called epistatic‚ while one whose phenotype is altered or suppressed is calledhypostatic. Epistasis can be contrasted with dominance‚ which is an interaction between alleles at the same gene locus. Epistasis is often studied in relation

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  • Gregor Mendel Essay

    pairs of alleles Phenotype the characteristics or traits of an organism Dominant allele An allele that has the same effect whether in heterozygous or homozygous Recessive alle An allele that has an effect only went and homozygous state Codominant alleles pairs of alleles that both affect the phenotypes when present in heterozygous locus the position on homologous

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  • Explain The Structure And Inheritance O

    connected by three hydrogen bonds. In DNA‚ two DNA strands coil together to create a double-helix‚ this is where base pairing occurs between the two strands when hydrogenous bonds are created between two bases. Genes also have variants‚ which are called alleles‚ which play a large part in the inheritance of genes via

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  • Review Genetics

    mentioned in the footnote on p. 263‚ we have simplified the explanation in referring to the single pea plant as a parent. Technically‚ the gametophytes in the flower are the two “parents.”) Concept Check 14.2 1. For any gene with a dominant allele A and recessive allele a‚ what proportions of the offspring from an AA Aa cross are expected to be homozygous dominant‚ homozygous recessive‚ and heterozygous? 1. 1⁄2 homozygous dominant (AA)‚ 0 homozygous recessive (aa)‚ and 1⁄2 heterozygous

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  • Workbook 6.2

    his gametes should have the G allele‚ and the other half should have the g allele. F 3. A Punnett square is a chart that allows you to easily determine the expected genotypes in the offspring of two parents. (expected percents) T 4. In a cross between two homozygous dominant individuals‚ 25% of the offspring may have the recessive phenotype. F 5. A parent cell makes gametes through the process of mitosis. T 6. It is entirely likely for a gene to have more than two alleles. F 7. Incomplete dominance

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  • gene worksheet

    each pair of homologous chromosomes. The alleles may be identical or different. (2)____Homozygous__________- when both alleles in a homologous chromosome pair have the same expression. Example: both alleles code for straight hairline at forehead. (3)______Heterozygous__________- when the alleles differ in their expression. Example: one allele codes for straight hairline and the other for widow’s peak. (4)______Dominant_________- in a heterozygous pair of alleles‚ it is the one that exerts its effects

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  • Dihyrbid Cross

    Dihybrid Cross Worksheet 1. Set up a punnett square using the following information: • • • • • Dominate allele for tall plants = D Recessive allele for dwarf plants = d Dominate allele for purple flowers = W Recessive allele for white flowers = w Cross a homozygous dominate parent (DDWW) with a homozygous recessive parent (ddww) 2. Using the punnett square in question #1: a. What is the probability of producing tall plants with purple flowers? Possible genotype(s)? b. What is the probability of

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  • hardy

    and circle your answers. 1) If the frequency of a recessive allele is 30% in a population of 100 people‚ how many would you predict would be carriers of this allele‚ but would not express the recessive phenotype? q= 0.30 p= 0.70 Carriers = 2pq = 2(.3)(.7) = .42 #= (.42)(100) = 42 individuals 2) From a sample of 278 American Indians‚ the following MN blood types were obtained: MM = 78‚ MN = 139‚ NN = 61. Calculate the allele frequency of M and N. M= 0.53 N= 0.47 MM = 78/278 = 0.281

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