Graded Assignment

Unit Assessment, Part 2: Evolution

Complete this teacher-scored portion of the assessment and submit it to your teacher.

Total score: ____ of 15 points

(Score for Question 1: ___ of 5 points)

1. The male resplendent quetzal bird has evolved to have tail feathers that are approximately 60 cm long. The female quetzal has short tail feathers. Using the quetzal as your example, describe how the mechanism of natural selection may have led to the evolution of the male quetzal’s extraordinarily long tail feathers.

Answer:

Type your answer here.

(Score for Question 2: ___ of 5 points)

2. Variation in a trait is a required condition for natural selection to act on a population for that trait. Assuming a population of organisms only started with only one form of a trait, what are two ways variation in the trait could be introduced into the population? Explain your answer.

Answer:

Type your answer here.

(Score for Question 3: ___ of 5 points)

3. Give a basic definition of evolution as taught in this unit.

Answer:

Type your answer here.

Gene map

Now you are ready to figure out the order of the genes for beak color, tail-feather length, and feather color on the chromosome and build a genetic map.

(Score for Question 1: Click or tap here to enter text. of 2 points)

1. List the distances between each pair of genes:

beak color and tail-feather length:

beak color and feather color:

tail-feather length and feather color:

Answer:

Type your answer here.

(Score for Question 2: Click or tap here to enter text. of 2 points)

2. Which two alleles are the farthest apart?

Answer:

Type your answer here

(Score for Question 3: Click or tap here to enter text. of 2 points)

3. Which two alleles are the closest together?

Answer:

Type your answer here.

(Score for Question 4: Click or tap here to enter text. of 2 points)

4. True or False: The diagram shows the correct genetic map for these three alleles on one chromosome.

Answer:

Type your answer here.

Lab Report: Gene Mapping

Answer the questions below. When you are finished, submit this assignment to your teacher by the due date for full credit.

For all questions, assume that you have genes for beak color, tail-feather length, and feather color all linked (located) on the same chromosome, but you don't know the order of the genes on the chromosome or the distance between them. The alleles for these genes are

beak color: Y for yellow beak (YY and Yy) and y for black beak (yy)

tail-feather length: L for long tail (LL and Ll) and l for short tail (ll)

feather color: B for blue feathers (BB and Bb) and b for white feathers (bb)

Total score: Click or tap here to enter text. of 22 points

Part 1: Crossing Beak Color and Tail-Feather Length

Cross a YyLl (heterozygous parent with dominant traits) with yyll (homozygous parent with recessive traits). Look at the number of genotypes of the F1 generation:

YyLl: 400

Yyll: 100

yyLl: 100

yyll: 400

(Score for Question 1: Click or tap here to enter text. of 2 points)

1. Which offspring are the recombinant offspring in this cross?

Answer:

Type your answer here.Click or tap here to enter text.

(Score for Question 2: Click or tap here to enter text. of 2 points)

2. How far apart are Y and L? Give your answer in map units. (Hint: Add the numbers of the two recombinant types, divide by the total number of offspring, and multiply by 100.)

Answer:

Type your answer here.Click or tap here to enter text.

Part 2: Crossing Beak Color and Feather Color

Cross beak color and feather color.

(Score for Question 1: Click or tap here to enter text. of 2 points)

1. Cross one parent that is heterozygous for both beak color and feather color with a parent that is homozygous for both recessive traits. What are the genotypes of the parents? (Hint: Recall that the P generation includes a heterozygous parent with dominant traits and a homozygous parent with recessive traits.)

Assume the following F1 generation:

YyBb: 420

Yybb: 80

yyBb: 80

yybb: 420

Answer:

Type your answer here.Click or tap here to enter text.

(Score for Question 2: Click or tap here to enter text. of 2 points)

2. Which offspring are the recombinant offspring in this cross?

Answer:

Type your answer here.Click or tap here to enter text.

(Score for Question 3: Click or tap here to enter text. of 2 points)

3. How far apart are Y and B?

Answer:

Type your answer here.Click or tap here to enter text.

Part 3: Crossing Tail-Feather Length and Feather Color

Cross a P generation, LlBb with llbb. Assume the following F1 generation:

LlBb: 480

Llbb: 20

llBb: 20

llbb: 480

(Score for Question 1: Click or tap here to enter text. of 2 points)

1. Which offspring are not the recombinant offspring in this cross?

Answer:

Type your answer here.Click or tap here to enter text.

(Score for Question 2: Click or tap here to enter text. of 2 points)

2. How far apart are L and B?

Answer:

Type your answer here.Click or tap here to enter text.

Part 4: Mapping Beak Color, Tail-Feather Length, and Feather Color

Now you are ready to figure out the order of the genes for beak color, tail-feather length, and feather color on the chromosome and build a genetic map.

(Score for Question 1: Click or tap here to enter text. of 2 points)

1. List the distances between each pair of genes:

beak color and tail-feather length:

beak color and feather color:

tail-feather length and feather color:

Answer:

Type your answer here.

(Score for Question 2: Click or tap here to enter text. of 2 points)

2. Which two alleles are the farthest apart?

Answer:

Type your answer here

(Score for Question 3: Click or tap here to enter text. of 2 points)

3. Which two alleles are the closest together?

Answer:

Type your answer here.

(Score for Question 4: Click or tap here to enter text. of 2 points)

4. True or False: The diagram shows the correct genetic map for these three alleles on one chromosome.

Answer:

Type your answer here.

© Stride, Inc. All rights reserved. No reproduction without written consent of Stride, Inc.Page 2 of 3

Graded Assignment-

Lab Report: Gene Mapping

Answer the questions below. When you are finished, submit this assignment to your teacher by the due date for full credit.

For all questions, assume that you have genes for beak color, tail-feather length, and feather color all linked (located) on the same chromosome, but you don't know the order of the genes on the chromosome or the distance between them. The alleles for these genes are

beak color: Y for yellow beak (YY and Yy) and y for black beak (yy)

tail-feather length: L for long tail (LL and Ll) and l for short tail (ll)

feather color: B for blue feathers (BB and Bb) and b for white feathers (bb)

Total score: Click or tap here to enter text. of 22 points

Part 1: Crossing Beak Color and Tail-Feather Length

Cross a YyLl (heterozygous parent with dominant traits) with yyll (homozygous parent with recessive traits). Look at the number of genotypes of the F1 generation:

YyLl: 400

Yyll: 100

yyLl: 100

yyll: 400

(Score for Question 1: Click or tap here to enter text. of 2 points)

1. Which offspring are the recombinant offspring in this cross?

Answer: The recombinant offspring in the cross YyLl x yyll are Yyll and yyLl

(Score for Question 2: Click or tap here to enter text. of 2 points)

2. How far apart are Y and L? Give your answer in map units. (Hint: Add the numbers of the two recombinant types, divide by the total number of offspring, and multiply by 100.)

Answer:

Type your answer here.Click or tap here to enter text.

Part 2: Crossing Beak Color and Feather Color

Cross beak color and feather color.

(Score for Question 1: Click or tap here to enter text. of 2 points)

1. Cross one parent that is heterozygous for both beak color and feather color with a parent that is homozygous for both recessive traits. What are the genotypes of the parents? (Hint: Recall that the P generation includes a heterozygous parent with dominant traits and a homozygous parent with recessive traits.)

Assume the following F1 generation:

YyBb: 420

Yybb: 80

yyBb: 80

yybb: 420

Answer:The genotypes of the parents in the cross YyBb x yybb are YyBb and yybb

(Score for Question 2: Click or tap here to enter text. of 2 points)

2. Which offspring are the recombinant offspring in this cross?

Answer:The recombinant offspring in the cross YyBb x yybb are Yybb and yyBb.

(Score for Question 3: Click or tap here to enter text. of 2 points)

3. How far apart are Y and B?

Answer:

Type your answer here.Click or tap here to enter text.

Part 3: Crossing Tail-Feather Length and Feather Color

Cross a P generation, LlBb with llbb. Assume the following F1 generation:

LlBb: 480

Llbb: 20

llBb: 20

llbb: 480

(Score for Question 1: Click or tap here to enter text. of 2 points)

1. Which offspring are not the recombinant offspring in this cross?

Answer:The non-recombinant offspring in the cross LlBb x llbb are Llbb and llbb.

(Score for Question 2: Click or tap here to enter text. of 2 points)

2. How far apart are L and B?

Answer:

Type your answer here.Click or tap here to enter text.

Part 4: Mapping Beak Color, Tail-Feather Length, and Feather Color

Now you are ready to figure out the order of the genes for beak color, tail-feather length, and feather color on the chromosome and build a genetic map.

(Score for Question 1: Click or tap here to enter text. of 2 points)

1. List the distances between each pair of genes:

beak color and tail-feather length:

beak color and feather color:

tail-feather length and feather color:

Answer:

Type your answer here.

(Score for Question 2: Click or tap here to enter text. of 2 points)

2. Which two alleles are the farthest apart?

Answer:

Type your answer here

(Score for Question 3: Click or tap here to enter text. of 2 points)

3. Which two alleles are the closest together?

Answer:

Type your answer here.

(Score for Question 4: Click or tap here to enter text. of 2 points)

4. True or False: The diagram shows the correct genetic map for these three alleles on one chromosome.

Answer:

Type your answer here.