Heredity lab report answers

Student Sheet

Name:

Date:

Instructor’s Name:

Assignment: SCIE207 Phase 3 Lab Report

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

A. 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.)

C

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

(Type the correct genotypes in the boxes.)

______ ______

______

______

Question

Answer

What is the genotype of the mother?

What is the genotype of the father?

What are the possible phenotypes of their children?

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

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?

Exercise 2: Freckles

C. 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.)

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

(Type in the genotypes.)

______ ______

______

______

Question

Answer

What is the genotype of the mother?

What is the genotype of the father?

What are the possible phenotypes of the children?

What is the probability of freckles in their children?

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?

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.)

A. 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).

______ ______

______

______

Question

Answer

What is the genotype of the mother?

What is the genotype of the father?

What are possible phenotypes of their children?

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

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.

Xc

X

B

XcB

Y

XCY

XcXC

XcY

XcXc

f

F

f

F

f

FF

FF

ff

Ff

ff

Ff

ff

Ff

IA

IB

IA

IB

IB

IA

i

i

IAIA

IAIA

IBIB

IBIB

IAIB

IAi

IBi

ii

IAi

IAIB

ii

IBi