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Linkage and Recombination

Linkage and Recombination

Linkage and Recombination. Mendel. Alleles segregate. Alleles for different genes assort independently. Morgan and Bridges. Genes are on chromosomes. Bateson et al. Pea plants have 7 pairs of chromosomes. Flies have 4 pairs. Humans have 23 pairs.

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What about two traits? Dihybrid Crosses

What about two traits? Dihybrid Crosses

What about two traits? Dihybrid Crosses. Consider two traits for pea: Color: Y (yellow) and y (green) Shape: R (round) and r (wrinkled) Each dihybrid plant produces 4 gamete types of equal frequency (amount). YyRr (adult) ? four gamete types: YR , Yr , yR or yr. Check point.

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Review Question If two genes are 13 map units apart on a linkage map, what proportion of recombinant offspring will be s

Review Question If two genes are 13 map units apart on a linkage map, what proportion of recombinant offspring will be s

Review Question If two genes are 13 map units apart on a linkage map, what proportion of recombinant offspring will be seen in a testcross? What proportion of meioses experienced crossing over between to the two genes?. Two X-linked genes. Female Male w m w+ m+

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703 views • 37 slides
Fig. 4-1

Fig. 4-1

Chapter 4 overview. Fig. 4-1. Genetic recombination : mixing of genes during gametogenesis that produces gametes with combinations of genes that are different from the combinations received from parents. Independent assortment of homologous chromosomes (Anaphase I). Genes on non-

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441 views • 34 slides
Heredity, Gene Regulation, and Development I. Mendel's Contributions

Heredity, Gene Regulation, and Development I. Mendel's Contributions

Heredity, Gene Regulation, and Development I. Mendel's Contributions II. Meiosis and the Chromosomal Theory III. Allelic, Genic, and Environmental Interactions IV. Sex Determination and Sex Linkage V. Linkage A. Overview. Independent Assortment. A. A. b. B. a. a. B. b. AB. ab.

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253 views • 25 slides
Genetics

Genetics

Genetics. 10.2 and 10.3. 10.2.2. Autosomes: any chromosome which is not a sex chromosome (22 pairs in humans) Autosomal traits/genes/inheritance Sex chromosomes: X and Y chromosomes which determine sex (1 pair in humans) Sex-linked traits/genes/inheritance. DIHYBRID CROSS.

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303 views • 22 slides
An early dihybrid cross

An early dihybrid cross

An early dihybrid cross.

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Chromosome Mapping

Chromosome Mapping

Chromosome Mapping. Recombination : in meiosis , recombination generates haploid genotypes differing from the haploid parental genotypes . The recombinants can be most easily visualized by test crosses .

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590 views • 12 slides

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