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Autor:   •  August 8, 2017  •  Lab Report  •  1,155 Words (5 Pages)  •  107 Views

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Biology Lab – Unit 3

AIU


Student Sheet

Title: Lab to Determine the Outcome of Heredity 

Instructions: You will fill out the Punnett squares and answer a set of questions for each exercise.

When your lab report is complete, submit this document to your instructor in your assignment box.

Using what you learned on the lab animation (and the images below), you will fill in the following Punnett squares and answer the questions that follow:

Exercise 1: Color Blindness

  1. Choose the parental gametes, and align these in the correct positions around the Punnett square. (Type in the correct gametes. Pink are the female gametes, and blue are the male gametes. XC is the gene for normal vision, and Xc is the gene for color blindness.)

[pic 1][pic 2][pic 3][pic 4]

        C

  1. Choose the correct genotype of the progeny to fill in the Punnett square.

(Type the correct genotypes in the boxes.)

[pic 5][pic 6][pic 7][pic 8]

        __X C ____        ___Xc___

[pic 9][pic 10]

        ___Xc_

[pic 11][pic 12]

        ___Y__

Question

Answer

What is the genotype of the mother?

 Xc XC

What is the genotype of the father?

 XcY

What are the possible phenotypes of their children?

 Xc Xc / XCY / Xc XC / XcY

What is the probability of the color blind trait in female children and the probability of the color blind trait in male children?

The probability is a 50/50 chance since the mother carries the chromosome that aids it and the father carries the trait.

X and Y genes code for male and female gender. XX is female and XY is male. Why is XcY color blind, but XcXC not color blind? Can an XcXC female pass the color blind trait to her children?

It is possible, but not probable. If the chromosome is available, there is a 50/50 chance of the child to be colorblind.

Exercise 2: Freckles

  1. Choose the parental gametes and align these in the correct positions around the Punnett square. (Type in the correct gametes. The pink are female gametes, and the blue are male gametes.)

[pic 13][pic 14][pic 15][pic 16][pic 17]

  1. Choose the correct genotype of the progeny to fill in the Punnett square.

(Type in the genotypes.)

[pic 18][pic 19][pic 20][pic 21]

        __F__        ___f___

[pic 22][pic 23]

[pic 24][pic 25]

        __f__

[pic 26][pic 27]

[pic 28][pic 29]

        __f__

Question

Answer

What is the genotype of the mother?

 Ff

What is the genotype of the father?

 ff

What are the possible phenotypes of the children?

 Ff

ff

What is the probability of freckles in their children?

Because only the mother carries the trait, which this means that only those with Ff have a chance of getting freckles.

Freckles in humans are inherited by which pattern: dominant/recessive, incomplete dominance, or codominance? Why does the mother have freckles, even though she has a gene for no freckles? Why does the father have no freckles?

Only the mother can pass on the trait which means they will likely have freckles since the father does not carry the trait for them.

Exercise 3: Blood Type

A male has Type A blood, and a female has Type B blood. Could they have a child with Type O blood? Demonstrate how this is genetically possible by filling out the Punnett square.

 

Choose the correct parental gametes from all of the potential blood type gametes below, and align these in the correct positions around the Punnett square. (Type in the correct gametes. The pink are female gametes, and the blue are male gametes.)

[pic 30][pic 31][pic 32][pic 33][pic 34][pic 35][pic 36][pic 37]

  1. Choose the correct genotypes of the progeny, and fill in the Punnett square.

(Type the correct genotypes into the boxes from the possible genotypes shown below).

[pic 38][pic 39][pic 40][pic 41][pic 42][pic 43]

[pic 44][pic 45]

                                           ___ IB___               ___i___

[pic 46][pic 47][pic 48][pic 49]

                  __ IA__

[pic 50][pic 51]

[pic 52][pic 53]

        ___i___

Question

Answer

What is the genotype of the mother?

 IB i

What is the genotype of the father?

 IA i

What are possible phenotypes of their children?

 IAIB

IAi

IBi

ii

What is the probability of Type AB blood in their children?

 There is no chance.

Ms. Johnson is suing her former husband for potential child support payments for her 2-year-old child. Mr. Johnson’s attorney forcefully denies the fatherhood of his client, stating that the child of Ms. Johnson has blood type O, while the blood type of Mr. Johnson has Type A blood. The lawyer claims that Mr. Johnson cannot be the father of a child with Type O blood. Is the attorney, right? Why or why not? Explain your answer.

Mr. Johnson’s attorney is erroneous, because a child with type O could have been made by a male that has type A depending on the mother’s type.

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