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MBG 2040 Lecture Notes - Lecture 3: Miosis, Y Chromosome, Meiosis

Independent assortment can mean that two genes are on different chromosomes. Genes a and b are on different chromosomes. Gametes produced by the test- cross parent: a b. Combine the gametes of the dihybrid parent with the gametes of the test-cross parent. Some genes are located near each other on the same chromosome. Genes a and b are on the same chromosome and are tightly linked. Instead of aabb, write the genotype to show linkage: Alleles in cis configuration (or alleles in coupling) Genes a and b are on the same chromosome and are tightly linked a. Instead of aabb, write the genotype to show linkage: ab. Alleles in trans configuration (or alleles in repulsion) Genes a and b are closely linked and crossing-over between them is occurring. a. Crossing over occurs in prophase of meiosis i. Numerous crossing-over events can occur between two homologous chromosomes. Bivalent or one crossing- over event is indicated here.

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Could someone explain why in patterns of inheritance genes on the same chromosome behave differently than genes on a different chromosome? And how were chromosomes initially mapped and what does crossing over have to do with such mapping?

Which of the following statements is accurate (select all that apply) <table style="width:729px;" summary=""> <tbody> <tr> <td style="vertical-align:middle;white-space:nowrap;">A</td> <td style="vertical-align:middle;width:699px;"> Haploid individuals can be heterozygous. </td> </tr> <tr> <td style="vertical-align:middle;white-space:nowrap;">B</td> <td style="vertical-align:middle;width:699px;"> Two homologous chromosomes have identical copies of the same genes. </td> </tr> <tr> <td style="vertical-align:middle;white-space:nowrap;">C</td> <td style="vertical-align:middle;width:699px;"> Mendel's law of segregation refers the separation of homologous chromosomes during meiosis. </td> </tr> <tr> <td style="vertical-align:middle;white-space:nowrap;">D</td> <td style="vertical-align:middle;width:699px;"> During independent assortment, sister chromatids separate from each other. </td> </tr> <tr> <td style="vertical-align:middle;white-space:nowrap;">E</td> <td style="vertical-align:middle;width:699px;"> Phenotype refers to the genetics make up of an individual. </td> </tr> </tbody> </table>

If Mendel had studied the seven traits using a plant with 12 chromosomes instead of 14, in what way would his interpretation have been different? (a) he would not have discovered the law of independent assortment (b) he would have discovered sex linkage (c) he could have mapped the chromosome (d) he would have discovered blending or incomplete dominance.

MBG 2040 Lecture Notes - Lecture 3: Miosis, Y Chromosome, Meiosis

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Related Questions

A	Haploid individuals can be heterozygous.
B	Two homologous chromosomes have identical copies of the same genes.
C	Mendel's law of segregation refers the separation of homologous chromosomes during meiosis.
D	During independent assortment, sister chromatids separate from each other.
E	Phenotype refers to the genetics make up of an individual.