University:
Texas A&M University
Course:
BIOL 111 | Introductory Biology I
Academic year:

2024
Views:

57

Pages:

3
Author:

Adowj7b

Genetics Worksheet, Punnett Squares Answer key Help Jeremy Pigeon Pigeon Color Alleles Pattern Alleles Janice Pigeon BW LL Jeremy Pigeon BW CL Jacque le Pigeon WD LL Jessica Pigeon WD CL Momma Pigeon WW LL Bartleby BD RL Domingo BW LL Domingo’s Mate WW LL Red Harry DD LL Jimmy John Blue BD CL What is Jeremy’s genotype? _________BWCL_______________ What must be the genotypes of Jeremy’s parents? ___WWLL and BDCL____________ Who is Jeremy’s father? ________Jimmy John Blue___________________ S-17 Genetics: Worksheet, Punnett Squares Reviewing the Concepts 1. Fill in the chart below with all the possible genetic combinations to express the given phenotype. Phenotype Genetic Combinations Bar RR, RL T- pattern Checker TT, TC, TR, TL Blue/Black BB, BW, BD Brown WW, WD 2. Draw a Punnett Square for the cross between a heterozygous bar-patterned male (genotype RL) and a barless-patterned female (genotype LL). What is the ratio of bar to barless pigeons? L R L ___________1:1___________ RL LL What phenotypes are expressed? ___________bar and barless______ L RL LL 3. Brown color pigment is actually a genetic mutation. Does this mutation harm or benefit the bird? Defend your answer in one to three sentences. Answers may vary. 4. Draw a punnett square for the cross between two heterozygous checker-patterned birds. One has the genotype CR, while the other has the genotype CL. C R What is the ratio of phenotypes? __________3:1_____(checker : bar)___ C CC CR L CL RL What phenotypes are expressed? ___________checker and bar_________ Genetics: Worksheet, Punnett Squares 5. Suppose you want to mate a recessive red pigeon to a blue/black pigeon. Two of the offspring from the match were brown. What are the genotypes of the parents? ______BW and DD______ 6. Dihybrid crosses explore the offspring possibilities using two different genes. What might a cross between a pigeon with the genotype BWTC and a pigeon with the genotype AWCR look like? BT BC WT WC AC ABCT ABCC AWTC AWCC AR ABRT ABRC AWRT AWRC WC WBCT WBCC WWCT WWCC WR WBRT WBCR WWRT WWRC What phenotypes do the offspring have? ash-red, t-pattern checker (4) ash-red, checker (4) blue/black, t-pattern checker (2) blue/black, checker (2) brown, t-pattern checker (2) brown, checker (2) Why might this kind of cross be useful when raising pigeons? It allows you to chart two traits at the same time. It demonstrates the genetic combinations available for two traits. It’s easier to determine the probability of producing a trait. (just to name a few)