Bellwork . What is genetics? The study of heredity What is heredity? The study of how traits are passed on from parent(s) to offspring. Chapter 10: Genetics (scientific study of heredity). 10.1 and 10.2: Work of Gregor Mendel. Gregor Mendel. His occupations: monk, gardener, teacher
What is genetics?
The study of heredity
What is heredity?
The study of how traits are passed on from parent(s) to offspring
10.1 and 10.2: Work of Gregor Mendel
Each gene comes in two different forms called alleles.
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*Organisms have two different alleles for each trait
Dominant alleles: capital letter
Recessive alleles: lowercase letters.
Example: Gene for plant height (t)
Dominant form: T (tall)
Recessive form :t (short)
TT tt Tt
“Genotype and environment determines your phenotype”
Example: He crossed true-breeding yellow pod plant and true-breeding green pod plant.
1. Genes are inherited.
“Some alleles are dominant, some alleles are recessive”
TT Tt tt
¼ yellow plants.
Law of Segregation: During the formation of gametes (meiosis), the paired alleles are separated from each other. Each gamete carries only a single allele from the original pair. They randomly unite at fertilization.
For each trait, the offspring inherit one allele from each parent.
Example: True-breeding green pod plants GG
True-breeding yellow pod plants gg
F1 Offspring were Gg (hybrids)