Lecture 2: Jan. 23, 2006 Transmission genetics: Principle of segregation.

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Lecture 2: Jan. 23, 2006 Transmission genetics: Principle of segregation

Sample problem 5’-ATGCCCTGCAGTACCATGACGCGTTACGCAGCTGATCGAAACGCGTATATATGCC-3’ 3’-TACGGGACGTCATGGTACTGCGCAATGCGTCGACTAGCTTTGCGCATATATACGG-5’ The restriction site for the enzymes PstI is: 5’-CTGCA  G-3’ If the enzyme PstI was used to cut the above DNA, what fragments would result?

The traits studied by Mendel

Mendel’s Results for Monohybrid Crosses Parental traits F 1 trait Number of F 2 progeny F 2 ratio Round x wrinkled (seeds) Round 5474 round, 1850 wrinkled 2.96:1 Yellow x green (seeds) Yellow 6022 yellow, 2001 green 3.01:1 Purple x white (flowers) Purple 705 purple, 224 white 3.15:1 Inflated x constricted (pods) Inflated 882 inflated, 299 constricted 2.95:1 Green x yellow (unripe pods) Green 428 green, 152 yellow 2.82:1 Axial x terminal (flower position) Axial 651 axial, 207 terminal 3.14:1 Long x short (stems) Long 787 long, 277 short 2.84:1

Explanation of the 3:1 phenotypic ratio of dominant: recessive