91. Cell Reproduction Notebook Check (stamped) 92. Karyotype Lab (graded) 93. Intro to Genetics Reading Guide (stamped) 94. Genetics Notes 95. Punnett Squares 96. More Punnett Square Practice 97. Exceptions to Mendel’s Rules 98. Oompah Loompa’s (stamped?) 99. Progress Report #6 (stamped) 100. POP QUIZ! 101. Pedigrees (a & b) 102. Ugly Baby Lab 103. Genetic Disorders (stamped) 104. Genetic Technology (a. notes & b. activity sheet) 105. Progress Report #7 (stamped) 106. Biotechnology Review 107. Genetics Practice 108. Genetics Notebook Check – starts on 3/31/11

3/31 & 4/4 Genetics Unit TEST and Notebook Checks! 4/1 Teacher Workday! Castle Learning Practice/Extra Credit closes on 3/30 at midnight!

a medical procedure used to diagnose chromosomal disorders in a developing fetus. A small amount of amniotic fluid, which contains fetal tissues, is extracted from the amniotic sac surrounding a developing fetus, and the DNA is examined.

Gregor Mendel = father of heredity – Mid 1800s purebred – Studied garden pea plants (because they could produce purebred individuals) – Studied how traits were passed from one generation to the next

– Mendel came up with several important concepts 1.Parents pass on genes 2.For each trait, an organism has 2 genes (1 allele from Mom and 1 from Dad) 3.Alleles can be dominant and recessive Tall plants could equal TT or Tt, short = tt Genotype Genotype = genetic make-up for trait (TT) Phenotype Phenotype = physical look of trait (tall)

identical If organisms contain two identical alleles for a trait, it shows that trait. Curly hair = HH Straight hair = hh different If organisms contain two different alleles for a trait, it shows the dominant trait. Curly hair = Hh

Used to predict the possible combinations of dominant and recessive alleles in the offspring. Genotypic ratio Genotypic ratio = 1 RR : 2 Rr : 1 rr Phenotypic ratio Phenotypic ratio = 3 pink : 1 yellow

Dad = XY, some sperm have X, some have Y Mom = XX, all eggs have X because that’s all Mom has to donate Who determines gender of baby – Mom or Dad?

The genes for traits found on different chromosomes separate independently when gametes are made.

homozygous recessive A deliberate genetic cross with a homozygous recessive individual that can be used to determine whether an organism is homozygous or heterozygous dominant for a trait.

Phenotype is a mix of genetics and environment

1.Green pea plant (GG) X Green pea plant (Gg) 2.Tall plant (TT) X short plant (tt) 3.Two tall plants (Tt) 4.Two white flowers (white = recessive) 5.Homozygous red flower X white flower 6.Homozygous dominant brown mouse X heterozygous brown mouse (tan = recessive) 7.Heterozygous white rabbit X black rabbit. 8.Two heterozygous white rabbits. (black = rec) 9.How would you figure out if a purple plant (dominant) is heterozygous vs. homozygous? #96 More Punnett Square Practice (make Punnett Squares & describe offspring using genotypic and phenotypic ratios)

GENOTYPIC RATIO PHENOTYPIC RATIO

Sometimes genetics isn’t always as simple as Mendel’s Law of Dominance

BLEND Heterozygote is a BLEND of the 2 homozygotes RR = red flowers rr = white flowers Rr = PINK flowers Cross two pink flowers. Genotypic ratio 1:2:1 Phenotypic ratio 1 red: 2 pink: 1 white

BOTH Heterozygote show BOTH traits BB = black cows WW = white cows BW = black & white BB X WW All BW offspring Genotypic ratio = 0:4:0 Phenotypic ratio = 0:4:0

Traits that have more than two alleles. Blood types –  3 alleles A and B are co-dominant O is recessive to A and B  4 phenotypes 1)Type A  blood contains “A” proteins  genotype: AA or AO

2) Type B  blood contains “B” proteins  (genotype: BB or BO) 3)Type AB  blood contains both proteins  genotype: AB 4) Type O  neither protein present in blood  Genotype: OO AB is an example of ________________.

Several genes are inherited from each parent for 1 trait. Many possible phenotypes. Examples: skin color, eye color, height, weight ABC, ABc, AbC, aBC = dark abc, abC, Abc, aBc = light

ABCABcAbCAbcaBCaBcabCabc ABC ABc AbC Abc aBC aBc abC abc

Located on X chromosome Females are only carriers Mostly males are affected Colorblindness, hemophilia, baldness X B X B = normal female X B X b = carrier female X b X b = colorblind female X B Y = normal male X b Y = colorblind male Cross a carrier female with a normal male. Explain the possible offspring.

Human Genome Human Genome - identifying the 30,000+ genes in human DNA and the order of the bases A, C, T, and G. Discovering new ways to diagnose, treat & prevent genetic disorders Trying to identify the location of all genes on chromosomes restriction enzymesgel electrophoresis To sequence DNA, scientists use restriction enzymes and gel electrophoresis

Applications of Biotechnology 1.DNA fingerprints – Analyzing the sequences of DNA to determine similarities or differences between different samples of DNA 2.Restriction enzymes – Cut fragments of DNA so that scientists can place them on gel electrophoresis – Steps of gel electrophoresis:gel electrophoresis

1.Blood/cell sample is isolated 2.Extract DNA 3.Cut DNA using restriction enzymes 4.Place fragments on gel 5.Fragments separated by electrical current 6.DNA bands can be matched/compared

Transgenic organisms 3. Transgenic organisms – Have DNA from another species inserted into their own DNA plasmid DNA – Restriction enzymes cut plasmid DNA (circular, not chromosomal) and foreign DNA recombinant DNA – “Stick” them together – makes recombinant DNA Amniocentesis 4. Amniocentesis (see karyotype lab) Cloning 5. Cloning - making genetically identical organisms – 4 steps: (see page 333)

Gel electrophoresis video WHAT ARE THESE THINGS??

WHAT PROCESS? # THE STEPS!

1.Refers to an individual’s observable traits. 2.Which of the following describes a phenotype? a. Ggb. homozygousc. dimplesd. heterozygous 3.What term describes an organism in which two alleles for a trait are different? 4.Crossing a purebred, purple-flowered plant with a purebred, white-flowered plant can be symbolized by which of the following genotype crosses? a. Ff X ffb. FF X ffc. Ff X Ffd. FF X FF 5. Two pea plants are crossed, TT X tt. Make a Punnett Square. Write the genotypic ratio. 6. AB blood is a result of what type of inheritance? 7. Know how to determine genotypic & phenotypic ratios… 8. Know how to analyze pedigrees…

9. White short-horned cattle and Black Angus cattle have been crossed to produce offspring with superior beef and rapid growth qualities. The process of choosing organisms with the most desirable traits for mating is… 10. Non-disjunction involving the X chromosome occurs during oogenesis and produces XX eggs and 0 eggs. If normal Y sperm fertilize the eggs, which genotypes are possible? a. XX &XY b. XXY &YOc. XYY & X0 d. XYY & X0 11. Huntington’s disease is what type of disease? 12. What is the job of a restriction enzyme? 13. A male with IAIB blood has a wife with O blood. What are the possible blood types of any children they may have? 14. Scientists have cloned sheep, but not yet a human. Why not, do you think? 15. What is a transgenic organism?

a)Individual showing the trait being tracked b)Male c)Generation # d)Offspring with birth order left to right e)Female f)Marriage/mating g)Sex undetermined I, II, III, IV

Words To Know 1.Pleiotropy 2.Codominance 3.Incomplete dominance 4.Polygenic Inheritance 5.Homozygous vs. heterozygous 6.Plasmid 7.Alleles 8.Replication, Transcription & Translation 9.Recombinant DNA 10. Karyotype 11. Cloning 12. Test cross 13. Sex-linked vs. autosomal 14. mRNA vs. tRNA 15. Synapsis 16. Crossing Over 17. Non-disjunction 18. Diploid vs. haploid 19. DNA fingerprint 20. Trisomy