University:
Abraham Baldwin Agricultural College
Course:
BIOL3200K | Genetics
Academic year:

2019
Views:

199

Pages:

4
Author:

Initafattaugsif

Worksheet: Dihybrid Crosses UNIT3:GENETICS STEP 1: Determine what kind of problem you are trying to solve. STEP 2: Determine letters you will use to specify traits. STEP 3: Determine parent's genotypes. STEP 4: Make your punnett square and make gametes STEP 5: Complete cross and determine possible offspring. STEP 6: Determine genotypic and phenotypic ratios. Two-Factor Crosses (Di-hybrid) Ex) A tall green pea plant (TTGG) is crossed with a short white pea plant (ttgg). Period TT or Tt = tall tt = short GG or Gg = green gg white TG TG TG TG tg TtGg TtGg TtGg TtGg tg TtGg TtGg TtGg TtGg TtGg TtGg TtGg TtGg tg TtGg TtGg TtGg TtGg 16 Tail/Green: 0 Tall/White: 0 Short/Green: 0 Short/White 1) A tall green pea plant (TTGg) is crossed with a tall green pea plant (TtGg) F TG OTg I tG Ltg TG TG TG Tg TG TIGG TTGS TT66 TTGS LG TEGG TEG TEGG TEGS 12 Talt/Green: 4 Tall/White: Short/Green: Short/White Name Period 2) A tall green pea plant (TtGg) is crossed with a Short white pea plant (ttgg). Firax tigg TG T9 EG Eg ta Ttba Tt ga ttba itag 4 Tall/Green: 4 To Tall/white: 4 short/Green: 45 short/white 3) A Homozygous tall, green flowered plant is crossed with a Homozygous short white flowered plant. Fibex tiga TG TG TG TG Le Tall/green: Tall/White: Short/green: Short/White