Genetic Diagrams Flashcards
what controls the characteristics you develop
the genes you inherit
what are the two ways characteristics can be controlled
- by single genes
- or by several genes interacting
what are alleles
different versions of genes
how many alleles of every gene do we have in our bodies
- 2 versions
- one on each chromosome in a pair
what condition has to be met for a characteristic to be homozygous
if an organism has two alleles for a particular gene that are the same
what condition has to be met for a characteristic to be heterozygous
if an organism has two alleles for a particular gene that are different
what are the two types of alleles
dominant and recessive
what is the relationship between dominant and recessive alleles
- dominant alleles overrule recessive alleles
- if an organism has one dominant and recessive, the dominant allele will determine the expressed characteristic (phenotype)
what is the only way for an organism to display a recessive characteristic
if both alleles are recessive
what is the genotype
the combination of alleles an organism has
what do your alleles determine
- what characteristics you have
- phenotype
what i the inheritance of a single characteristic called
monohybrid inheritance
what is a monohybrid cross used to show
how recessive and dominant traits for a single characteristic are inherited
explain the crossing of 2 homozygous hamsters (bb and BB) where BB and Bb are normal where as bb is super
- crossing of B and B with b and b
- Bb (genotypes)
- Bb
- Bb
- Bb
- all of the offspring and normal (phenotype)
explain the crossing of 2 heterozygous hamsters (Bb and Bb) where BB and Bb are normal where as bb is super
- crossing of B and b with B and b
- BB
- Bb
- Bb
- bb
- 3:1 ratio of normal to super hamster
- 75% chance of normal hamster a d 25% chance of super
