The new Broncos head coach has decided to ask the PCB3063 course to breed a new
ID: 193538 • Letter: T
Question
The new Broncos head coach has decided to ask the PCB3063 course to breed a new mascot (he feels it will increase his chances of making the play-offs next year), so you do the following experiment You cross true-breeding white broncos to true-breeding orange broncos in the Parental generation You find out that all of the F1 broncos are blue You cross F1 blue broncos together and in the F2 generation get 91 blue broncos, 47 white broncos, and 33 orange broncos. 1. 2. 3. Hint: True breeding is when the same allelic combination will always result (F1) after self-fertilization ex. True breeding Long (dominant), wrinkled (recessive) pea plants-LLww The T locus determines if pigment can be produced: T- codes for blue pigment t codes for orange pigment The A locus determines if pigment can be deposited into the hair shaft: A- allows pigment to be deposited into the hair shaft aa prevents pigment from being deposited into the hair shaft 5. What is the genotype of the true-breeding white and orange broncos in the P generation? (please use the letters T/t and A/a) White: TTaa Orange: ttAA 7. What is the genotype of the blue F1 broncos: TtAa 8. Draw a Punnett square that explkns the cross of the blue F1 broncos and the F2 offspring: at At AAT AAtt AT AaTT AaTt AT AATT AaTt Aatt At AaTtExplanation / Answer
5. The white broncos have a genotype TTaa because dominant T locus produces blue pigment but a recessive A locus does not allow this pigment to be deposited in the hair shaft. This is a reason you get white broncos with this genotype.
The orange bronco have a genotype ttAA because recessive T locus produces orange pigment while dominant A locus allows the pigment to be deposited in the hair shaft.
6. The F1 generation having all blue broncos will have a genotype TtAa because the heterozygote at both T and A locus will allow blue pigment to be produced and also gets deposited in the hair shaft.
7. The blue F1 broncos are crossed having genotype TtAa
The F2 offsprings have white broncos: aaTT, aaTt, aatt
Blue broncos: AATT, AATt, AaTT, AaTt
Orange broncos: AAtt, Aatt
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