Introduction To Genetics unit 9 Flashcards
We inherit 2 sets from who.
One from mom and one form dad
Paired chromosomes are called what?
Homologous chromosomes
Gene
A segment of DNA that codes for a particular trait
Trait
An inherited characteristic
Ex: eye color
Allele
Different versions (alternate forms) for a gene at a single location in the DNA
What are some examples of alleles
For the eye color gene there are several alleles- brown, blue, green, etc
Dominant
Observed trait of an organism. Masks any other allele.
Brown eyes B
Recessive
Masked by dominant alleles
Blue eyes b
Where are alleles found
Homologous chromosomes
Whom do you receive alleles from
Mom and dad
How many alleles do you have
2 one from each parent
Genotype
The alleles of an individual
HH two dominant is
Homozygous dominant
hh two recessive is
Homozygous recessive
Hh one dominant one recessive
Heterozygous
Phenotype
The appearance of of an individual
What is an example of phenotype
There are only three types of genotype a (HH, Hh, hh) but only two appearances (phenotype = hitchhikers thumb or not)
Chromosomes are?
Discrete package of DNA that codes for genes.