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NAME: DATE: BLOCK: 1. For each genotype, indicate whether it is heterozygous (HE) or homozygous (HO) AA ____ Bb ____ Cc ____ Dd ____ Ee ____ ff ____ GG ____ HH ____ Ii ____ Jj ____ kk ____ Ll ____ Mm ____ nn ____ OO ____ Pp ____ 2. For each of the genotypes below, determine the phenotype. Purple flowers are dominant to white flowers PP ___________________________ Pp ___________________________ pp ___________________________ Brown eyes are dominant to blue eyes BB ___________________________ Bb ___________________________ bb ___________________________ Round seeds are dominant to wrinkled RR ___________________________ Rr ___________________________ rr ___________________________ Bobtails are recessive (long tails dominant) TT ___________________________ Tt ___________________________ tt ___________________________ 3. For each phenotype, list the genotypes. (Remember to use the letter of the dominant trait) Straight hair is dominant to curly. ____________ straight ____________ straight ____________ curly Pointed heads are dominant to round heads. ____________ pointed ____________ pointed ____________ round 4. Set up the square for each of the crosses listed below. The trait being studied is round seeds (dominant) and wrinkled seeds (recessive) Rr x rr What percentage of the offspring will be round? _______ NAME: DATE: BLOCK: Rr x R r What percentage of the offspring will be round? _______ RR x Rr What percentage of the offspring will be round? ___________ In rabbits, grey hair is dominant to white hair. Also in rabbits, black eyes are dominant to red eyes. GG = gray hair Gg = gray hair gg = white hair BB = black eyes Bb = black eyes bb = red eyes 5. What are the phenotypes (descriptions) of rabbits that have the following genotypes: Ggbb ____________________ ggBB ________________________ ggbb ____________________ GgBb _________________________ 6. A male rabbit with the genotype GGbb is crossed with a female rabbit with the genotype ggBb The square is set up below. Fill it out and determine the phenotypes and proportions in the offspring. How many out of 16 have grey fur and black eyes? ____ How many out of 16 have grey fur and red eyes? _____ NAME: DATE: BLOCK: How many out of 16 have white fur and black eyes? ____ How many out of 16 have white fur and red eyes? _____ 7. A male rabbit with the genotype GgBb is crossed with a female rabbit with the genotype GgBb The square is set up below. Fill it out and determine the phenotypes and proportions in the offspring. Draw the Punnet Square. How many out of 16 have grey fur and black eyes? ____ How many out of 16 have grey fur and red eyes? _____ How many out of 16 have white fur and black eyes? ____ How many out of 16 have white fur and red eyes? _____ Practice with Crosses. Show all work! 8. A TT (tall) plant is crossed with a tt (short plant). What percentage of the offspring will be tall? ___________ 9. A Tt plant is crossed with a Tt plant. What percentage of the offspring will be short? ______ NAME: DATE: 10. A heterozygous round seeded plant (Rr) is crossed with a homozygous round seeded plant (RR). What percentage of the offspring will be homozygous (RR)? ____________ 11. A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. What are the genotypes of the parents? __________ x _________ What percentage of the offspring will also be homozygous? ______________ 12. In pea plants purple flowers are dominant to white flowers. If two white flowered plants are cross, what percentage of their offspring will be white flowered? ______________ 13. A white flowered plant is crossed with a plant that is heterozygous for the trait. What percentage of the offspring will have purple flowers? _____________ BLOCK: NAME: DATE: 14. Two plants, both heterozygous for the gene that controls flower color are crossed. What percentage of their offspring will have purple flowers? ______________ What percentage will have white flowers? ___________ 15. In guinea pigs, the allele for short hair is dominant. (S) What genotype would a heterozygous short haired guinea pig have? _______ What genotype would a purebreeding short haired guinea pig have? _______ What genotype would a long haired guinea pig have? ________ 16. Show the cross for a pure breeding short haired guinea pig and a long haired guinea pig. What percentage of the offspring will have short hair? __________ 17. Show the cross for two heterozygous guinea pigs. What percentage of the offspring will have short hair? ________ What percentage of the offspring will have long hair? _______ BLOCK: NAME: DATE: BLOCK: 18. Two short haired guinea pigs are mated several times. Out of 100 offspring, 25 of them have long hair. What are the probable genotypes of the parents? ________ x ___________ Show the cross to prove it! Cattle Genetics Using the information provided, show the punnett square for each of the crosses and answer the questions. SHOW ALL WORK! YOU MAY USE A SEPARATE SHEET OF PAPER. Female= XX Male= XY Polled = P Horned = p Black coat = B Red coat = b Solid = S Spotted = s Face color white = F Face color black = f Solid tail = T Striped tail = t Solid legs = L stocking legs = l 1. A black coated cow is crossed with a red coated bull (Bb X bb). What is the percentage of black calves? What is the percentage of red calves? 2. A horned cow is crossed with a polled bull (pp X Pp). What is the percentage of horned calves? What is the percentage of polled calves? Which is more advantageous and why? 3. A solid tailed cow is cross with a solid tailed bull (Tt X Tt). What is the percentage of solid tailed calves? What is the percentage of striped tailed calves? 4. A cow is crossed with a bull (XX x XY). What is the percentage the calves will be female? What is the percentage the calves will be male? 5. A solid legged cow is crossed with a solid legged bull (Ll X Ll). What is the percentage the calves will solid legged? What is the percentage the calves will be stripped legged? 6. A black coated cow is crossed with a black coated bull. (Bb X Bb). What is the percentage of black calves? What is the percentage of red calves? 7. A solid legged cow is crossed with a stocking legged bull (LL X ll). What is the percentage of stocking legged calves? What is the percentage of solid legged calves?
