Flashcards in Chapter 9 (Pt. 1) Deck (32):
study of heredity
-unit of heredity
-part of chromosome that control traits
-father of genetics
Blending Hypotheses Of Inheritance
genetic info of parents blend producing offspring of characteristics
Mendel proposed & tested the ______ ________ __ ______ using garden peas for his experiments
Particulate Hypotheses of Heredity
Pea strains showed clear...
Mendel controlled matings b/c peas normally...
self-fertilize, he could CROSS-fertilize them
Mendel knew he could disprove BLENDING hypotheses...
if parental forms reappeared in offspring
Mendel experimented with
14 strains of pure bred peas
In Mendels experiment The F1 Generation showed _____ ____ of the Parental Generation but NOT the ______ trait
matings btwn. individuals differing in ONE trait studied
generation he starts off with
-may be most common
-if you have one dominant trait, your going to be dominant
Mendel allowed F1 hybrid plants to self-fertilize...
producing seed for F2 Generation
-CAN skip generations
-only show up if you have TWO recessive traits
The recessive traits reappeared, but NO _______ ______ appeared, disproving the _______ hypothesis
Mendel found most F2 generations showed approx...
3:1 ratio of DOMINANT : recessive traits
Classic Mendeilian ratio
dominant : recessive
Unit of Heredity
produced short-stemmed plants in P passed to F1 generation
-alternate form of gene
We now know genes are
discrete sections of chromosomes
Each chromosome has ONE...
allele per gene
Mendel decided that a hybrid has 2 different alleles, one _______ & one ______
Pure breeding parents have identical _____
PHYSICAL appearance of organism
-pure breed organisms
-pair of IDENTICAL alleles
-genetic makeup of organism
ex. purple allele, white allele
-hybrids with 2 DIFFERENT alleles for trait
Mendel’s Principal Of Segregation:
SEXUALLY reproducing diploid organisms have...
-TWO copies of each gene
-split during formation of haploid GAMETES
Mendel developed Testcross to determine genotype of...
organism showing dominant trait