BIOL 234 Reading

Flashcards from the reading assignments

Monohybrid

heterozygote for a single gene (A/a)

dihybrid

heterozygote for 2 genes (A/a. B/b)

Dihybrid cross ratio (both d, 1d&1r, 1r&1d, both r)

9:3:3:1

Hybrid vigor

Superiority of multiple heterozygotes (when many homozygotes with desired traits are crossed to get a hybrid having a mix of desirable traits)

Homogametic

related to sex chromosomes, both gametes are similar (human female)

heterogametic

related to sex chromosomes, both gametes are non-identical (human male)

X-linked dominant

1. Affected males will pass on to all daughters

2. Affected females will pass on to half daughters & half sons

Hemizygous

only one copy of a gene is present in a diplod organism. (x linked genes in a human male)