BIOL 121 Lecture Notes - Lecture 13: Meiosis, Y Chromosome, Reciprocal Cross
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BIOL 121 Full Course Notes
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Change in a gene (mutant = individuals with mutated traits) Set of matings where mother"s phenotype in first cross is father"s phenotype in second cross; and father"s phenotype in first cross is mother"s phenotype in second cross. Sex chromosomes refer to the x and y chromosomes in organisms. X and y chromosomes are different in size and shape the y chromosome is smaller. However, they have regions that are similar enough to lead to proper pairing during prophase i of meiosis i. The gene for a trait is located on the x chromosome and the y chromosome does not carry an allele for the gene. Though x and y chromosomes synapse during prophase i, they differ in size, shape and gene content. The physical association of genes that are found on the same chromosome. If two or more genes are linked, it means they are located on the same chromosome. Linked genes violate the principle of independent assortment.