Bell Work In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers....

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Bell Work • In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers. The B allele is dominant to the b allele. • A pigeon with genotype Bb is crossed with a pigeon with genotype bb. What percent of the offspring are expected to have ash-red feathers? • Justify your answer. You do not need to copy the question.

Transcript of Bell Work In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers....

Page 1: Bell Work In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers. The B allele is dominant to the b allele. A pigeon with.

Bell Work• In pigeons, the allele B produces ash-red

feathers. The allele b produces blue feathers. The B allele is dominant to the b allele.

• A pigeon with genotype Bb is crossed with a pigeon with genotype bb. What percent of the offspring are expected to have ash-red feathers?

• Justify your answer. You do not need to copy the question.

Page 2: Bell Work In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers. The B allele is dominant to the b allele. A pigeon with.

Dihybrid Cross:a cross that shows the possible offspring

for two traits

Fur Color:B: Black b: White

Coat Texture:R: Roughr: Smooth

In this example, we will cross a heterozygous individual with

another heterozygous individual. Their genotypes will be:

BbRr x BbRr

Page 3: Bell Work In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers. The B allele is dominant to the b allele. A pigeon with.

Dihybrid Cross

BbRr x BbRr

Step 1: Find ALL possible gametes that can be made from each parent.

Remember, each gamete must have one B and one R.

Page 4: Bell Work In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers. The B allele is dominant to the b allele. A pigeon with.

Dihybrid CrossBbRr x BbRr

Possible gametes:BRBrbRbr

Step 2: Arrange all possible gametes for one parent on the top of your Punnett Square and the other parent on the side

Page 5: Bell Work In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers. The B allele is dominant to the b allele. A pigeon with.

Dihybrid Crosses:a cross that shows the possible offspring for two traits

Fur Color:B: Black b: White

Coat Texture:R: Roughr:

Smooth

BbRr x BbRr

BR

bR

br

bR

Br

BR

br

Br

Step 3: Fill in the Punnett Square (find the possible genotypes of the offspring)

Page 6: Bell Work In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers. The B allele is dominant to the b allele. A pigeon with.

Dihybrid Crosses:a cross that shows the possible offspring for two traits

Fur Color:B: Black b: White

Coat Texture:R: Roughr:

Smooth

BbRr x BbRr

BR

bR

br

bR

Br

BR

br

Br

BBRR

BbRR BbRr

BBRr BBrr BbRr Bbrr

BbRR BbRr bbRR bbRr

BbRr Bbrr bbRr bbrr

BBRr

Page 7: Bell Work In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers. The B allele is dominant to the b allele. A pigeon with.

BR bR

br

bR

Br

BR

br

Br

BBRR

BbRR

BbRr

BBRr BBrr BbRr Bbrr

BbRR

BbRr bbRR

bbRr

BbRr Bbrr bbRr bbrr

BBRr

How many of the offspring would have a black, rough coat?

How many of the offspring would have a black, smooth coat?

How many of the offspring would have a white, rough coat?

How many of the offspring would have a white, smooth coat?

Fur Color:B: Black b: White

Coat Texture:R: Roughr:

Smooth

Page 8: Bell Work In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers. The B allele is dominant to the b allele. A pigeon with.

BR bR

br

bR

Br

BR

br

Br

BBRR

BbRR

BbRr

BBRr BBrr BbRr Bbrr

BbRR

BbRr bbRR

bbRr

BbRr Bbrr bbRr bbrr

BBRr

How many of the offspring would have black, rough coat?

How many of the offspring would have a black, smooth coat?

How many of the offspring would have a white, rough coat?

How many of the offspring would have a white, smooth coat?

Fur Color:B: Black b: White

Coat Texture:R: Roughr:

Smooth

Phenotypic Ratio=

9:3:3:1

Page 9: Bell Work In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers. The B allele is dominant to the b allele. A pigeon with.

Practice in your notes…

In pea plants, yellow seeds (Y) are dominant over green seeds (y), and rounded peas (R) are dominant over wrinkled peas (r).

Cross (what do you have to draw?) a plant that is heterozygous for both traits with a plant that is homozygous recessive for both traits. Draw a Punnett square to show all possible offspring, and determine the genotypic and phenotypic ratios.

Page 10: Bell Work In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers. The B allele is dominant to the b allele. A pigeon with.

YyRr X yyrr

YR yR

yr

yr

yr

yr

yrYr

YyRr yyRr yyrr

YyRr Yyrr yyRr yyrr

YyRr Yyrr yyRr yyrr

YyRr Yyrr yyRr yyrr

Yyrr

Page 11: Bell Work In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers. The B allele is dominant to the b allele. A pigeon with.

More Practice

• Work on the SpongeBob Dihybrid Cross worksheet. Turn it in at the end of class.

Page 12: Bell Work In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers. The B allele is dominant to the b allele. A pigeon with.

Mendelian Genetics Review

Get with a partner.

Walk around the room and answer the review questions with your partner.

If you get all the answers correct, you will get 1 extra point on your quiz!

Page 13: Bell Work In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers. The B allele is dominant to the b allele. A pigeon with.

1. What is a genotype? The genes (letters) that determine a phenotype

2. A man is heterozygous for a trait. Will the dominant or recessive trait be expressed? Why? Dominant because dominant covers recessive

3. What does it mean if a woman is homozygous recessive? Using the letter “B,” write her genotype. Both of her genes are recessive (bb)

4. What is a phenotype? The physical characteristics of an organism

Page 14: Bell Work In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers. The B allele is dominant to the b allele. A pigeon with.

5. Long eyelashes (E) are dominant to short eyelashes (e). A heterozygous woman is crossed with a homozygous man. What is the percent chance their offspring will have short eyelashes? (Must draw a Punnett square) 0% (see board)

6. The offspring of two parents has a 100% chance of being homozygous recessive for blue eyes. If this is the case, what must the genotype be for both parents? bb

7. What does homozygous mean? Write an example. Homozygous means the same letters are present Ex. BB or bb

Page 15: Bell Work In pigeons, the allele B produces ash-red feathers. The allele b produces blue feathers. The B allele is dominant to the b allele. A pigeon with.

8. What does heterozygous mean? Write an example. That the genes are different Ex. Bb

9. What does it mean if a gene is expressed? The phenotype for that gene is seen (dominant)

10.What does a dihybrid cross show? Genetic possibilities for 2 traits

11.What was Mendel’s predicted genotypic ratio for a typical dihybrid cross? 9:3:3:1

12.Hazel eyes (H) are dominant to green eyes (h). A homozygous dominant man is crossed with a homozygous woman. What is the percent chance their offspring will have green eyes? (Must draw a Punnett square!) 100% (see board)


GENETIC INHERITANCE - s5ee8b77f7f9dee0d.jimcontent.com€¦ · Genetic Inheritance Heterozygous Dominant allele Recessive allele • An allele which express its phenotype even in

GENETIC INHERITANCE - s5ee8b77f7f9dee0d.jimcontent.com€¦ · Genetic Inheritance Heterozygous Dominant allele Recessive allele • An allele which express its phenotype even in

2. The inability of the dominant allele to make up for the presence of the recessive allele is associated with _____. A. codominance B. epistasis C. incomplete.

2. The inability of the dominant allele to make up for the presence of the recessive allele is associated with _____. A. codominance B. epistasis C. incomplete.

easytutorial · c. Monohybrids d. None of these 21. Which one of the followings is assigned an uppercase letter? a. Superior allele b. Dominant allele c. Inferior allele d. Mutant

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A preview of Feathers 2.2 and the Feathers SDK

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BB Bbbb Bb bb Populations: Allele Frequencies. 1) Suppose that the frequency of the b allele in the population is.3. a) What is the frequency of the B.

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DO NOW The allele B carries the trait for blue body color. The allele b carries the trait for pink body color. Cross Bb and BB.

DO NOW The allele B carries the trait for blue body color. The allele b carries the trait for pink body color. Cross Bb and BB.

1. In a certain species of flowering plant, the blue allele B is dominant to the white allele, b. A student carried out a cross between a blue flowered.

1. In a certain species of flowering plant, the blue allele B is dominant to the white allele, b. A student carried out a cross between a blue flowered.

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B-Bolivia, an Allele of the Maize b1 Gene with Variable Expression, Contains … · B-Bolivia, an Allele of the Maize b1 Gene with Variable Expression, Contains a High Copy Retrotransposon-Related

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B-Bolivia, an Allele of the Maize b1 Gene with Variable Expression ...

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Vocabulary Vocabulary Workshop B Unit 1 Intro. Feathers of Hope © 2014.

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Ask A Biologist - Biology Bits - Feathers€¦ · think about feathers. All birds have feathers. But not all birds fly. So what else do feathers do? Feathers help all birds stay at

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Feathers - EURAPMON

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Summer feathers

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Pearson Edexcel Centre Number Candidate Number Level 3 GCE … · 2020-03-05 · The dominant allele, B, produces blue feathers and the recessive allele, b, produces red feathers.

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Evolution by genetic drift random fluctuation in allele frequencies allele loss or fixation allele frequency differences between populations.

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€¦ · (b) (i) Dominant allele and recessive allele ... chromosome in his body. (b) Flatter face, ... Rats and grasshoppers (b) Four (c) The Sun

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