Posted by: mrborden | June 2, 2013

Week 35 Last Full Week Genetics


Friday June 7 ( mating game)
Multiple Alleles and probability of phenotype outcomes
Lab 1 Genetics
Objective: The students should know and be able to predict the probable outcomes of phenotypes in a genetic cross from the genotypes of the parents and mode of inheritance
Materials: Other students in class with clothes on
Procedure:
1) Students will draw 25 punnett squares on a separate sheet of paper and title it the observation section
2) Mark a little X in the corner of 1 of the 4 boxes in all punnett squares
3) Students will pair up with 5 members of the opposite sex in the class and trade genotypes.
4) The genotypes are as follows:
Boys –Shoes(ear type)D=dangling dd attached tennis shoes receive DD all other shoes dd
Girls – Shoes Sandals Dd shoes dd
Boys shirt color = blood type white AB blue AO red BO green AA purple BB all others OO
Girls shirt/blouse color = blood type white AB blue AO red BO green AA purple BB all others OO
Boys Pants = Hair color shorts = Bb brown hair pants = BB black hair blue shorts = bb Blonde hair
Girls Pant/skirts = Hair color shorts = Bb brown hair pants = BB black hair blue shorts/skirt = bb Blonde hair
Boys – Eye Color wears a watch = EE ( brown eyes) No watch Ee (green eyes) wears or has a hat or over 3 earrings ee (blue)
Girls– Eye Color wears a watch = EE ( brown eyes) No watch Ee (green eyes) wears or has a hat or over 3 earrings ee (blue)
Boys – Sex type boy/girl wear a belt – X does not wear a belt Y
Girls with 2 ears – X

5) Record the data for each encounter in the punnett squares. Record the boys genotype on top and the girls genotype on the left (3 people X 5 traits = 15 boxes)
6) After you are finished with a member of the opposite sex , record your data using the Xs you marked earlier. For instance you may have a Dangling eared, AB blood type, Blonde haired, green eyed, Boy. Write the combination of traits next to the punnett squares

Observation- see punnett squares

Conclusion – Write a paragraph on what you learned by doing this activity and include common traits that seemed to appear more often than others and why they occurred more often

Homework : Write a dihybrid cross and state the probable outcomes for one brown haired man –green eyed BbEe and a woman with brown hair and brown eyes BbEE = Hair color shorts = Bb brown hair pants = BB black hair blue shorts =
Thursday June 6
80 points mono 70 points dyhybrid crossses
Two-Factor Crosses (Di-hybrid) EC problems
1. In man, assume that spotted skin (S) is dominant over non-spotted skin (s) and that wooly hair (W) is dominant over non-wooly hair (w). Cross a marriage between a heterozygous spotted, non-wooly man with a wooly-haired, non-spotted woman. Give genotypic and phenotypic ratios of offspring.
2. In horses, black is dependent upon a dominant gene, B, and chestnut upon its recessive allele, b. The trotting gait is due to a dominant gene, T, the pacing gait to its recessive allele, t. If a homozygous black pacer is mated to a homozygous chestnut trotter, what will be the appearance of the F1 generation?
3. In snapdragon flowers, red color is not completely dominant over white color and tall plants are dominant over short plants. What would expect to get from a genetic cross of a homozygous tall red snapdragon with a short white plant? Give genotypic and phenotypic ratios of the offspring.
4)One cat carries heterozygous, long-haired traits (Ss), and its mate carries homozygous short-haired traits (ss). Use a Punnett square to determine the probability of one of their offspring having long hair.
5) In chupacabras , long teeth is dominant to short hair and red eyes is dominant to black eyes. A male hybrid for both teeth and eyes is mated with a purebred long tooth, hybrid red eyed female
What is the phenotype of the F1?
6) In mermaids, big hair is dominant to short hair and long tails are dominant to short tails. If a purebred short hair male with a hybrid long tail mates with a hybrid for both hair and tail type.
What is the phenotype of the F1?

Wednesday June 5
http://www.scienceprimer.com/punnett-square-calculator
Students will learn that offspring inherit entire chromosomes from their
parents.
• Students will recognize that if two genes are parts of the same chromosome,
they will inherit them together.
• Students will recognize that if two genes are parts of different chromosomes,
they will inherit them independently.
• Students will distinguish the difference in inheritance patterns between two
characteristics that are parts of one chromosome and two characteristics that
are determined by genes that are parts of different chromosomes.
• Students will utilize the principles of probability to predict the outcome of
genetic crosses for two traits.
• Students will utilize the principles of probability to explain genetic crosses
involving more than one trait.
o Students will use Punnett Square and Pedigree Charts to examine
patterns of heredity.

Name:________________________________ Date:________________

Genetic Dihybrid Worksheet – show your answers on the back of this paper

Problems: Monohybrid, Dihybrid, and Test Crosses1. In hamsters, black coat is dominant to white coat and rough coat is dominant
to smooth coat. If two heterozygous black-rough coated hamsters where mated
a. What would be the phenotype ratio of the F 1 generation?
b. What would be the genotype ratios of the F 1 generation?

2. In garden peas, axial flower position is dominant and terminal flower position is recessive; tall vine is dominant and short vine recessive. A plant known tobe purebred for tall vine and axial flowers is crossed with a plant having short vines and bearing terminal flowers
a. What is the phenotype of the offspring?
b. What is the genotype of the offspring?
c. Predict the types of offspring (their phenotypes) that would appear in the F
2 generation and their ratio.

3. In dogs, wirehair is a dominant trait, smooth hair is recessive. Two wire-haired dogs produce a male puppy that is wire-haired. To find out most quickly whether he carries the allele for smooth hair, he should be mated to what type of female?

4. In a certain animal, a breed is known that always has a hairy tail; another breed is known that always has a naked tail. How would you determine which trait is dominant?

5. In cocker spaniels, black is a dominant trait (B), red is recessive (b). Solid color is dominant (S) and white spotting is recessive (s). A red male was mated to a black-and-white female. They had five puppies as follows: 1 black,1 red, 1 black-and-white, and 2 red-and-white. What are the genotypes of the parents?

6. Two plants having red flowers are mated. When their F 1 offspring are studied, it is found that 95 have red flowers and 31 have white flowers. What is the genotype of the parents and diagram a cross to support your answer.

Tuesday June 4
My perseverance paid off – I passed the Biology CSET – Yay
1)One cat carries heterozygous, long-haired traits (Ss), and its mate carries homozygous short-haired traits (ss). Use a Punnett square to determine the probability of one of their offspring having long hair.
A) 100%
B) 25%
C) 75%
D) 50%

2 One cat carries heterozygous, long-haired traits (Ss), and its mate carries homozygous short-haired traits (ss). Use a Punnett square to determine the probability of one of their offspring having short hair.
A) 25%
B) 50%
C) 75%
D) 100%

3 One flower is heterozygous red (Rr) and it is crossed with a homozygous white (rr) plant. Use a Punnett square to determine the probability of one of their offspring having a red color.
A) 75%
B) 25%
C) 50%
D) 100%

4 One flower is heterozygous red (Rr) and it is crossed with a homozygous white (rr) plant. Use a Punnett square to determine the probability of one of their offspring having a white color.
A) 100%
B) 25%
C) 75%
D) 50%

5 In a certain species of plant, the color purple (P) is dominant to the color white (p). According to the Punnett Square, what is the probability of an offspring being white?
A) 25%
B) 0%
C) 75%
D) 100%

6 In a certain species of plant, the color purple (P) is dominant to the color white (p). According to the Punnett Square, what is the probability of an offspring being purple?
A) 25%
B) 0%
C) 100%
D) 75%
7 In a certain species of plant, the color purple (P) is dominant to the color white (p). According to the Punnett Square, what is the probability of an offspring being white?
A) 50%
B) 25%
C) 75%
D) 100%
8 In a certain species of plant, the color purple (P) is dominant to the color white (p). According to the Punnett Square, what is the probability of an offspring being purple?
A) 75%
B) 25%
C) 50%
D) 100%
9 In a certain species of pine trees, short needles (S) are dominant to long needles (s). According to the Punnett square, what is the probability of an offspring having short needles?
A) 50%
B) 25%
C) 75%
D) 100%
10 In a certain species of pine trees, short needles (S) are dominant to long needles (s). According to the Punnett square, what is the probability of an offspring having long needles?
A) 25%
B) 50%
C) 75%
D) 100%

markbbcard
Monday June 3 2013

Meiosis – process that produces sex cells with half the number of chromosomes ( heredity)
Genes – are characteristics of an organism, units of heredity
Dominant genes – stronger genes Recessive Genes – weaker genes because they disappear when they are paired with a dominant gene
Law of segregation – one allele (trait) from each parent segregates or separates into each sex cell
Law of independent assortment – all gene traits are inherited independently of all other genes or traits (ex. Blue eyes – brown hair)
Some genes are co-dominant where both traits are expressed (blood) called incomplete dominance
Pheno type – The physical appearance of a gene or visible characteristics
Geno Type – the genetic makeup of an individual ex XX XY BB bb
EX Man has an X and Y chromosome
Woman has 2 X chromosomes
Mutations occur when there is a change in the gene expressions or in the chromosomes
Genetics – study or science behind heredity and the probability to predicting offspring (children)studied by Gregory Mendel in 1860
Homozygous Dominant – 2 dominant genes ex BB, PP, GG
Homozygous recessive – 2 recessive genes ex bb, pp, gg
Hybrid or Heterozygous – 1 dominant gene and 1 recessive gene and expresses the dominant gene ex Bb, Pp, Gg
Punnett Squares – a process to determine the probability of a gene expression in gametes


This article begins by describing the classic Mendelian patterns of inheritance and also the physical basis of those patterns—i.e., the organization of genes into chromosomes. The functioning of genes at the molecular level is described, particularly the transcription of the basic genetic material, DNA, into RNA and the translation of RNA into amino acids, the primary components of proteins. Finally, the role of heredity in the evolution of species is discussed.
genetics%20wkst
Punnett%20Square%20worksheet
Punnett Squares Worksheet
Use Punnett Square to answer the following questions. Show your work.
1. Widow’s peak is dominant to no widow’s peak. Determine the genotype and
phenotype ratios for a homozygous dominant female and a homozygous recessive male.
2. Dimples is dominant to no dimples. Determine the genotype and phenotype ratios for
a heterozygous female and a homozygous dominant male.
3. Short hair is dominant to long hair in mice. Determine the genotype and phenotype
ratios for a homozygous recessive female and a heterozygous male.
4. Cleft chin is dominant to no cleft chin. Determine the genotype and phenotype ratios
for a heterozygous female and a heterozygous male.
5. Brown eyes are dominant to blue eyes. Determine the genotype and phenotype ratios
for a homozygous dominant female and a homozygous dominant male.
6. Purple flowers are dominant to white flowers in pea plants. Determine the genotype
and phenotype ratios for a homozygous dominant female and a heterozygous male.
7. Brown hair is dominant to gray hair in mice. Determine the genotype and phenotype
ratios for a homozygous recessive female and a homozygous recessive male.
8. Free ear lobes are dominant to attached ear lobes. Determine the genotype and
phenotype ratios for a heterozygous female and a homozygous recessive male.
9. Green peas are dominant to yellow peas. Determine the genotype and phenotype
ratios for a heterozygous female and a heterozygous male.
10. Tall plants are dominant to short plants. Determine the genotype and phenotype
ratios for a homozygous recessive female and a homozygous dominant male

genetics

genetics1

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