Introductory Genetics review - answer key
Class notes in ppt plus worksheets
Mendel & Meiosis outline notes
|Mendel's Dihybrid Crosses||Exceptions to Mendel's Laws|
|Sponge Bob practice||Sex Determination & Sex-linked Traits|
|Pedigree Analysis||Pedigree worksheet||Review sheets on basic genetics|
|Sponge Bob Dihybrid practice sheets||Sponge Bob Codominance practice sheets||Bikini Bottom Genetics Review|
|Monohybrid worksheets||Dihybrid worksheets|
Wisconsin Fast Plants - Brassica rapa
Mendel's genetics - extra information
Human Traits Survey - lab activity
Classical Genetics Jeopardy - game
Genetics Web Lab Directory - interactive activities on MANY topics in genetics/biology!
Genetics Review Answer Key
Some good links for extra practice:
Punnett Squares - notes and diagrams
|Online Genetics Tutorials||Classical Genetics - simple explanation||Basic principles of genetics crossword puzzle|
|Virtual Fly Lab & worksheet||Classical genetics ppt - notes||Pedigree analysis|
|Corn genetics - lab activity||Drag & Drop Monohybrid Crosses||Basic Genetics worksheet practice|
|Study of genetic corn lab activity||Definitions for terms in Genetics problems||Index of Biology topics - exercises|
|Baby Steppin' Through Punnett Squares -very good!!||Interactive genetics problems||More genetics problems for practice|
|Still more practice||Personal pedigree assignment||Pedigree Investigator|
|Pedigree practice assignment||More practice on Mendel||AP Genetics problems|
|More genetics practice||Patterns of Inheritance||Pea Soup Experiment|
|Sponge Bob Genetics Quiz||Science of Heredity - key concepts notes||Mendelian Genetics|
|Mendel's Inheritance - interactive||Phenotypes lab activity||Genetics Lesson Plan Ideas|
|Genetics in Action - lesson & activities|
adapted from Kimball's Biology Pages
|P gametes (round parent)|
One-third of the round seeds and all of the wrinkled seeds in the F2 generation were homozygous and produced only seeds of the same phenotype.
But two thirds of the round seeds in the F2 were heterozygous and their self-pollination produced both phenotypes in the ratio of a typical F1 cross.
So if a generalization is valid, then certain specific consequences can be deduced from it.
In order to test his hypothesis, Mendel predicted the outcome of a breeding experiment that he had not yet carried out. He crossed heterozygous round peas (Rr) with wrinkled (homozygous, rr) ones. He predicted that in this case one-half of the seeds produced would be round (Rr) and one-half wrinkled (rr)
To a casual observer in the monastery garden, the cross appeared no different from the P cross described above: round-seeded peas being crossed with wrinkled-seeded ones. But Mendel predicted that this time he would produce both round and wrinkled seeds and in a 50:50 ratio. He performed the cross and harvested 106 round peas and 101 wrinkled peas.
This kind of mating is called a testcross. It "tests" the genotype in those cases where two different genotypes (like RR and Rr) produce the same phenotype.Mendel did not stop here.
Little attention was paid when Mendel published his findings in 1866. Not until 1900, 34 years later and 16 years after his death, was his work brought to light. By then, three men — working independently — discovered the same principles. So the present remarkable development of genetics dates from only the start of the 20th century.
The discovery of chromosomes — and their behavior during meiosis (2n -> n) and fertilization (n + n -> 2n) — established the structural basis for Mendel's rules.What is the status today of Mendel's rules? Although many important exceptions to them have been discovered — two examples: