Lecture 18 - mendelian genetics Flashcards
1
Q
Define the term monohybrid.
A
cross between homozygous dominant and homozygous recessive
2
Q
Define the term dihybrid.
A
cross between homozygous dominant and recessive tracking 2 genes
3
Q
Why would you carry out a Testcross?
A
to identify if the genotype is dominant
4
Q
State Mendel’s 1st and 2nd laws, both of which relate to chromosomal behaviour during meiosis.
A
1: law of segregation - genes segregate at meiosis so each gamete contains only one of the two possessed by the parent
2: independent assortment - alleles of different genes assort independently during gamete formation
5
Q
What is the F2 phenotypic ration for a dihybrid cross
A
9:3:3:1
6
Q
What is the F2 phenotypic ration in a monohybrid cross.
A
3:1
