Question

Background Information for Question 1:

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Banshees can be grey or white, have seven, five or three tendrils, and red, orange or yellow eyes. Grey (G) is dominant to white (g). Tendrils form a dominance series where, three (T3) > five (T5) > seven (T7). Banshees homozygous for E'E' have red eyes, those homozygous for EYEY have yellow eyes and heterozygotes (E’EY) have orange eyes. G and T are on the same chromosome while E is on a different chromosome. A true breeding grey banshee with five tendrils and red eyes is mated to a true breeding white banshee with three tendrils and yellow eyes. The F1s are then crossed to a true breeding white banshee with seven tendrils and yellow eyes.

Question 1 A)

What is the inheritance pattern of eye colour? Explain your answer.

Multiple choice, Select one:

a. Red is incomplete dominance to yellow and the heterozygotes have orange eyes.

b. Red is dominant to orange and yellow. Orange is recessive to red but dominant to yellow. Yellow is recessive to both red and orange.

c. We need more information to answer the question.

d. Red is dominant to yellow.

e. Red is co-dominant to yellow, and the heterozygotes have orange eyes.

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Question 1 B)

Write out the parent cross (P-generation) giving the genotype and phenotype of both parents. Correctly showing linked alleles where necessary. (2 marks)

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Question 1 C)

What is the genotype and phenotype of the F₁s? Correctly show linked alleles where necessary. (2 marks)

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Question 1 D)

You had crossed the F₁s to a true-breeding white banshee with seven tendrils and yellow eyes.

a) Write out the genotypes for this cross, correctly showing linked alleles where necessary. (2 marks)

b) What proportion of offspring would be white banshees with five tendrils, if eye colour doesn't matter? Give value as a decimal. Show your work. (1 mark)

c) What proportion of offspring would be grey banshees with three tendrils and orange eyes? Show your work. (3 marks)

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Please show all your work so I can understand. Thank you!

Answer 1

Answer 1) A.

Red is incompletely dominant over yellow allele. Because orange color is produced in the heterozygous genotype. Here intermediate color of both alleles are produced. That's why this is the intermediate inheritance.

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1B) The parent 1 and 2 genotype is in the image:

Parent Parent 2 Я T5 E 3 T X g 11 g T 5 En g T3 EY

C)

Parent I Parent 2 T 3 Я T5 Er EY g x Я і TS Er g T3 EY Punnet square g T3 EY gametes 5 TS Er EY Three tendrie qI El Grey Banshee , and eye ot T3 orane

D) A)

느 Er 9 T5 7 T g T E EY X EY T7 EY T 3 qo مه