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# Page 1 of 4 Lesson 7 Laboratory: Punnett Squares Part I: Answer the following questions utilizing the virtual laboratory simulation: TYPE ANSWERS

Hi, would you be able to answer this by midnight tomorrow April 28th, Central STandard time ?

Lesson 7 Laboratory Drop Box

Punnett Squares Laboratory Directions

1. Utilize the information in the Podcast:

and the Virtual Laboratory: Punnett Squares

2. Click the monitor in the lab simulation to watch a video about heredity (transcript). Next, click the "Information” bar at the bottom of the lab simulation and read all the background information. Read all background information and instructions in the "Question” column and answer questions 1-5 on the lab worksheet. Follow the instructions in the "Question” column to complete the Punnett Square simulations. Record your results in Table 1 of the lab Worksheet (you are expected to complete all 10 scenarios by clicking on the reset button in the lower right corner of the laboratory simulation).

3. Answer the questions on the WORKSHEET

Page 1 of 4 Lesson 7 Laboratory: Punnett Squares Part I: Answer the following questions utilizing the virtual laboratory simulation: TYPE ANSWERS HERE 1. Recessive alleles are represented by: a. an upper case letter b. a lower case letter c. it does not matter what type of letter is used 2. If a fruit Fy is heterozygous for eye color (Bb) what alleles will be present in his sperm? a. 50% will contain “B” and 50% will contain “b” b. 100% will contain “b” c. 25% will contain “B” and 75% will contain “b” c. 100% will contain “B” 3. In fruit Fies, black eye color is dominant over sepia. Using the letter B to represent eye color, what is the genotype of a heterozygous black eyed Fy? a. BB b. bb c. Bb d. BBbb 4. All of the o±spring of two black eyed Fies are also black. What can you conclude about the genotypes of the parent Fies? a. They are both heterozygous b. They are both homozygous dominant c. They are both homozygous recessive d. You cannot conclude anything de²nitively about the parental genotypes 5. Some of the o±spring of two black eyed Fies have sepia eyes. What can you conclude about the genotypes of the parent Fies? a. They are both heterozygous b. They are both homozygous dominant c. They are both homozygous recessive d. You cannot conclude anything de²nitively about the parental genotypes
Page 2 of 4 Part II: Follow the instructions in the Question column to complete the virtual lab scenarios and record your data. Complete all ten scenarios and record your results in Table 1 below. When you record a ratio, whether it is genotypic or phenotypic ratio, always record the most dominant characteristic frst, Followed by the recessive. ±or example, when recording genotypic ratios: 1) IF your o²spring genotypes include 1 GG, 2 Gg, and 1 gg, the ratio would be: 1 GG : 2 Gg : 1 gg 2) IF your o²spring genotypes include 2 GG and 2 Gg, the ratio would be: 2 GG : 2 Gg or 1:1 in the reduced Form 3) IF your o²spring genotypes are 4 gg, then the ratio would be written as: 4 gg When you record phenotypic ratios For a monohybrid cross, there are only two possible phenotypes - either the dominant phenotype or the recessive phenotype. So you do not need to indicate the phenotype, simply put the dominant # frst, Followed by the recessive #: 4) IF your o²spring phenotypes are 3 dominant and 1 recessive, the ratio is: 3:1 5) IF your o²spring phenotypes are 4 dominant and 0 recessive, the ratio is: 4:0 6) IF your o²spring phenotypes are 0 dominant and 4 recessive, the ratio is: 0:4 Table 1: Question Scenario # Genotype of Parent I Genotype of Parent II Genotypic Ratio of O±spring Phenotypic Ratio of O±spring 6 1 7 2 8 3 9 4 10 5 11 6 12 7 13 8 14 9 15 10 Part III: Real world application. Use the information presented below to answer the questions concerning cystic ²brosis. Cystic fbrosis is a genetic disease that a²ects many di²erent parts oF the body. There are approximately 30,000 Americans with cystic fbrosis. The most serious problem is the production oF extremely thick, sticky mucus that clogs up the bronchial tubes in the lungs and the passageways in the
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This Punnet square predic±s ±he resul±s of a cross be±ween ±wo he±erozygous ±all pea plan±s. Each game±e carries only one of ±he ±wo alleles ±ha± con±rols heigh± in pea plan±s. The alleles from one paren± are writen over ±he ±op boxes of ±he Punnet square and ±he alleles of ±he o±her paren± are writen ±o ±he leF of ±he square. To de±ermine ±he possible geno±ypes of all o²spring, each box is ³lled in wi±h ±he alleles ±o ±he ±op and ±o ±he leF side of ±ha± box. Each box ±hen con±ains ±wo alleles, one possible geno±ype. You can see ±ha± ±here are ±hree di²eren± possible geno±ypes and ye± only ±wo possible pheno±ypes.

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Lesson 7 Laboratory: Punnett Squares
Part I: Answer the following questions utilizing the virtual
1. Recessive alleles are represented by:
a. an...

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