Sex chromosomes and dosage Flashcards
incomplete dominance
heterozygote has phenotype that is intermediate between that of homozygotes
co-dominance
different alleles give qualitatively different dominant traits and you see both traits in heterozygotes at the same time
ABO blood types
example of co-dominance; there are different carbs on the blood’s surface and can cause transfusion reactions
I gene
the gene that codes for blood type
pleiotropy
a single mutation may affect many tissues and processes
autosome
non sex chromosomes
pseudoautosomal region
region on sex chromosomes that allows homologous pairs to be linked (the coding regions match)
SRY gene
in males, encodes a master transcription factor for the creation of testes and testosterone
sex linked gene
many genes that are found on X are not found on Y and vice versa
hemizygous
half diploid, ex. X and Y do not have the same genes so an XY zygote would only have one of each gene region