Mendelian genetics Flashcards
1
Q
before mendel
3 points
A
- ‘blending’ hypothesis
- fathers information blended with mothers information in off spring
- information mixed and forever changed
2
Q
how mendel disproved blending
5 points
A
- worked with peas (controlled fertilisation)
- chose varieties with discrete traits
- started with pure breeding strains
- produced large number of hybrid plants
- counted offspring and followed pattern of inheritance
3
Q
law of segregation
2 points
A
- 2 alleles for each trait separate during meiosis
2. unite at random (1 from each parent) at fertilisation
4
Q
phenotype
A
observable properties (appearance) e.g. wrinkled shape
5
Q
genotype
A
genetic makeup - alleles present
e.g. heterozygous or homozygous
6
Q
heterozygous
A
e.g. Ss
2 different alleles
heterozygous genotype
a heterozygote
7
Q
homozygous
A
e.g. SS
homozygous genotype
a homozygote
8
Q
test cross
A
used to distinguish genotypes
