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Biology Genetics

What is genetics and Mendel's ideas

Worked with garden peas to determine basic ideas of trait inheritance Gregor Mendel
passage of traits to next generation inheritance or heredity
organisms that consistently produce offspring with only one form of a trait true-breeding or pure-breeding
science of heredity or inheritance genetics
father of genetics Gregor Mendel
shorthand for the parent generation P generation
offspring of the P generation or parent generation F generations ( F1,F2 etc) F= filial
Explain what happened in Mendel's cross between a true-breeding yellow and green pea plant... The F1 were all yellow ( more questions).. what happened to the green trait? more experiments ..He let F1 self pollinate and self fertilize to get the F2. The green reappeared 3 yellow to 1 green
Number of factors for each trait ( and why) 2 factors for each trait ( one from each parent)... The yellow peas could have two yellow or a yellow and green factor... the green peas have two green factors
Newer term for Mendel's factors genes and alleles
different forms of the same gene (alternative form of single gene) for example in pea plants for color there is a yellow form or green form alleles
the form of gene (allele) that appeared in the F1 generation of Mendel's peas cross . It covered up the other form when there was one of each (Yy) dominant
the form of gene( allele) that was masked or covered up in the F1 generation of Mendel's pea cross. This will only appear when there are two of these present in the organism recessive
the only way for the recessive trait to show in the organism have two recessive genes
the two alleles for each trait separate during meiosis and then during fertilization the two alleles for the trait unite Mendel's law of segregation
there are two forms of alleles for a trait. One form will hide or mask the other form if they are together. The masked or hidden form can only appear when two are present. (note: this is not always true).. One of Mendel's major ideas Law of Dominance ( and recessiveness)
What happens to the chromosome number during meiosis It is divided in half
what process restores the chromosome number to make it the same for each generation of the species ( this process helps humans maintain a chromosome number of 46) fertilization
Created by: shemehl



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