Exam 2 Flashcards
Mendel studied:
autosomal inheritance
Gene
holds two alleles, influences a particular trait
allele
a particular form of gene
Genotype
a listing of the alleles of particular genes in an individual
phenotype
an individual’s observable traits
homozygous
having two of the same allele
heterozygous
having two different alleles
autosomal
a chromosome that isn’t sex
a gamete carries _____
1 allele for each trait
Principle of separation
allele pairs split from each other during the production of gametes
monohybrid cross
cross between two heterozygotes
Monohybrid cross (Rr) genotype values
1/4 RR
2/4 Rr
1/4 rr
monohybrid cross (Rr) phenotype values
3:1
what principle does monohybrid cross show?
principle of segregation
Independent assortment
alleles of different genes (seed shape and color) are transmitted independently of each other
dependent assortment
alleles of different genes (seed shape and color) are transmitted together
both
rule of multiplication
either, or
rule of addition
dihybrid cross
two traits
Offspring genotypes values (RrYy x RrYy)
9/16 R-Y-
3/16 R-yy
3/16 rrY-
1/16 rryy
Offspring phenotype values (RrYy x RrYy)
9/16 R-Y-
3/16 R-yy
3/16 rrY-
1/16 rryy
what principle does dihybrid cross show?
principle of independent assortment
how does meiosis explain principle of segregation
separation of homologous chromosomes in anaphase 1
how does meiosis explain principle of independent assortment
Genes on different chromosomes assort independently in Meiosis 1
(4 types of gametes are produced)