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Punnett squares no answers 4.02
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- 3. Punnett Squares How topredict traits in offspring
- 4. Important Vocabulary 1. Homozygous– when you have two of the same genes for a particular trait a. You are PUREBRED (2 dominant or 2 recessive) b. TT (tall) tt (short) BB (brown eyes) 2. Heterozygous – When you have two different genes for a particular trait a. You are Hybrid (always 1 dominant and 1 recessive) b. Tt (tall) Bb (brown eyes)
- 5. Homozygous and Heterozygous PracticeProblems T = tall B = brown eyes 1. 2. 3. 4. 5. 6. t = short b = blue eyes Homozygous tall: _________________ Homozygous short: _______________ Heterozygous tall: ________________ Homozygous brown eyes: __________ Heterozygous brown eyes: _________ Homozygous blue eyes: ___________
- 6. Bikini Bottom Genetics 1.For each genotype below, indicate whether it is heterozygous (He) or homozygous (Ho) TT ____ Tt ____ BB ____ Bb ____ tt _____ FF ____ DD ____ dd ____ ff _____ Ff ____ Dd ____ bb _____ 2. Which of the genotypes would be considered purebred? _______________________________________________ 3. Which of the genotypes would be considered hybrids? ________________________________________________
- 7. Punnett Squares 1. PunnettSquares – a grid showing genetic material - Shows probability, not actual results Uses percentage to predict what might happen to the offspring 0 %, 25%, 50%, 75% or 100%
- 8. Punnett Square Problems T= tall t = short 1. A heterozygous tall man has children with a homozygous short women. 1. Write down the genotypes of the parents Tt Father = _________ tt Mother = _________
- 9. Step 1 –Draw a box and put a line going down and across
- 10. Step 2 –Put Mother’s genes on top of box and father’s on left hand side t T t t
- 11. Step 3 –bring letters down and across
- 15. Completed Punnett Square tt t Endresult: T Tt t Tt Tt 50 % tall _____ 50 % short _____ t tt tt
- 16. B = browneyes b = blue eyes A father is homozygous for brown eyes and the mother is homozygous for blue eyes. What is the expected outcome? BB Father = ______ b bb Mother = ______ 100 % ____ heterozygous 0 ____ % homozygous b B Bb Bb B Bb Bb
- 17. G = Greenpea g = yellow pea A heterozygous green pea plant is crossed with homozygous green pea plant. What is the expected outcome? Gg Plant 1 = ______ G GG Plant 2 = ______ 50 ____ % heterozygous 50 ____ % homozygous g G GG Gg G GG Gg
- 18. T = tall t= short A mother and father are both heterozygous for being tall. Tt Father = ______ Tt Mother = ______ 75 ____ % tall T t T TT Tt t Tt t t 25 ____ % short
- 19. C = curlyhair c = straight hair A dog that is purebred for straight hair is bred with a dog that is hybrid for curly hair. cc Dog 1 = ______ Cc Dog 2 = ______ 50 ____ % c C Cc Cc c cc cc purebred 50 ____ % hybrid c
- 20. How to Makea Punnett Square. 1. Draw a square and divide it into 4 sections. 2. Write the genotypes for one parent on the top and one down the side. 3. Fill in the sections with one allele from top and one from the side. 4. Figure out the percentages (each box is worth 25%)
- 21. Try making yourown P-square!
- 22. Incomplete Dominance WHITE •There’s always an exception to the rule! • Genes are the same way. There are times when a blending of the genes occur. • Skin color or Flower color often does this. RED AND PINK
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