Ch 11 Flashcards
True breeding
All children have same traits
Genetics
Study of heredity
Hybrid
Kids whose parents had different traits
Trait
A specific characteristic
Gene
DNA code for a trait
Allele
The gene options
Fertilization
Sperm meeting egg
Gamete
Sex cell (sperm or egg)
Zygote
Cell when sperm and egg meet
Gregor Mendel
Austrian monk born 1822
Studied genetics and taught high school
Keep meticulous quantitative data
Gregor Mendel’s experiment on pea plants
Very short reproductive lines
Simple control of offspring
Many obvious traits
Able to selectively breed or self pollinate
(Mendel’s crosses) p
The two parent plants
Two different true breeding (yellow and green)
(Mendel’s crosses) F1
The first generation (p x p)
All offspring have same allele (green)
(Mendel’s crosses) f2
Second generation (f1 x f1) 1/4 of offspring have a different allele than parents (3/4 green and 1/4 yellow)
(Mendel’s conclusions) An individuals characteristics (traits) are determined by
Factors (genes) that are passed from one parent generation the next
(Mendel’s conclusions) an individual gets
One allele from each parent
(Mendel’s conclusions) principle of dominance
Some alleles are dominant (always appear) and others are recessive (hidden by the dominant)
(Mendel’s conclusions) Law of segregation
During gamete formation the alleles for each gene separate from each other, so that each gamete carries only one allele for each gene
Homozygous
Having two of the same alleles
Heterozygous
Having two different alleles
Phenotype
The appearance of the individual
Genotype
The allies in their genes (DNA)
Probability
The chance that a particular event will occur
Allies are represented by
Letters