Deviations From Mendel’s Ratios (HSC SSCE Biology): Flashcards

Both alleles fully expressed simultaneously

Alleles blend to create intermediate phenotype

Male gamete (X or Y chromosome from sperm)

XX

XY

Hemizygous: only one X, no second allele to mask recessive

Female with one mutant allele, no symptoms, can pass it on

1:2:1 (differs from Mendel's 3:1)

Three or more alleles for one gene in population

$I^A$, $I^B$, $I^i$