Science UNIT TEST Flashcards
(to study)
A person that has the gene for a trait of the disease but doesn’t show it.
Carrier
The chromosomes that determine sex.
Sex Chromosome
The alleles you inherit.
Genotype
When the heterozygous genotype results in a phenotype where the two alleles are blended together.
incomplete dominance
The macromolecule that has the instructions for making who you are.
DNA
A genotype resulting in from the inheritance of the same alleles from your parents.
Homozygous
The physical trait expressed.
Phenotype
Overshadows the other allele in the heterozygous state.
Dominant
Section of a chromosome that codes for a single protein.
Gene
A genotype resulting from the inheritance of two different alleles from your parents.
Heterozygous
Genes that travel on the X chromosome.
Sex-linked
Only expressed in the homozygous state.
Recessive
Chromosomes 1-44 in a human.
Autosome
When the heterozygous genotype results in a phenotype where both alleles are fully and separately expressed.
codominance
A version of a gene.
Allele
Why are men never heterozygous for an x-linked trait
The trait carried on the x chromosome and males will have only 1 x chromosome
Why must men always inherit an x-linked trait from their mother
Because they will only inherit a Y from their dad and the trait is carried on the x
Can a colorblind pass this allele on to his sons
No, because he can only give his son a Y, and the trait is carried on the x
Can a normal male ever have a daughter that is colorblind
No because she would have to get a gene for the trait from both parents
Homozygous for the “B” allele
I^B, I^B
Heterozygous for the “A” allele
I^A, i
Type O
ii
Type “A” and had a Type “O” parent
I^A i
Type AB
I^A, I^B
