1. A TT (tall) pea plant is crossed with a tt (short) plant.                         What percentage of the offspring will be tall?   _____________%         A Tt pea plant is crossed with a Tt pea plant.                        What percentage of the offspring will be short?              _____________%       3. A heterozygous round seeded plant (Rr) is crossed with a homozygous round seeded plant (RR).                        What percentage of the offspring will be homozygous (RR)?                _____________%

1. what is the progeny difference of Sire B? 2. what is the progeny difference of Dam A?

Mendelian Genetics Worksheet Name Hour Fill in the Punnett squares for each cross given to determine the phenotype and genotype ratio's of the offspring Crosses with one homozygous dominant parent: AA x AA A AA x Aa A АА х а A AA x aa A A A A A a A a a Offspring Genotypes: AA AA AA Aa Offspring Phenotypes: Aa Aa aa aa aa Dominant Dominant Recessive Dominant Recessive Recessive_ _ Crosses with one heterozygous parent: Aа х АА Аа х Аа Аа х аа A a A a A a A a A a a Offspring Genotypes: AA_ Aa_ aa AA Aa aa AA_ Aa aa Offspring Phenotypes: Dominant Recessive Dominant Dominant Recessive Recessive _ Crosses with one homozygous recessive parent: aa x AA aa x Aa аа х аа a a a a a a A A a A a a Offspring Genotypes: AA Aa_aa AALAA_aa AA Aa_ aa_ Offspring Phenotypes: Dominant Dominant Dominant Recessive_ Recessive_ Recessive _

6.    A heterozygous purple plant is crossed with a white plant. A.    Write the genotype of the purple and white plants. B.    Write the gametes formed by the purple plant and proportions in which they occur.   C.    Write the gametes formed by the white plant and proportions in which they occur.   D.    Combine the gametes using a Punnett square.           E.    Write the genotypes of the offspring and the ratio in which they occur.       F.    Write the phenotypes of the offspring and the ratio in which they occur.

5. If flower color shows codominance, and R = red and r = white, what will the %3D %3D offspring of a cross between RR x rr look like? * 100% red 75% red, 25% white 100% red and white 100% pink 25% red, 50% red and white, 25% white

2. A trait in garden peas involves the curling of leaves. A dihybrid cross was made involving a plant with yellow pods and curling leaves to a wild-type plant with green pods and normal leaves. All F1 offspring had green pods and normal leaves. The F1 plants were then crossed to plants with yellow pods and curling leaves. The following results were obtained: 117 green pods, normal leaves 115 yellow pods, curling leaves 78 green pods, curling leaves 80 yellow pods, normal leaves A. Conduct a chi square analysis to determine if these two genes are linked. B. If they are linked, calculate the map distance between the two genes. How accurate do you think this distance is?

3. You are studying single gene traits in peas. These are the traits you are following: Gene Symbol Alleles enistic Pairs Appeerance of Hybrid dominant ait) Seed eoler deteric Yellow pea is dominant to green Round pea is dominant to wrinkled Purple flower is dominant to white flowers Unripe pods are dominant to ripe pods Yly R/r Yellow P/p U/u ound Wrinkied Round Flower clor You cross pollen from a pea that is of genotype YyRrPpUu with ovules from a pea whose genotype is YYrrPpUU a. How many different types of gametes can the female produce? Pod color (up) b. How many different types of gametes can the male produce? C. What fraction of the progeny will be phenotypically identical the female parent? d. What fraction of the progeny will be phenotypically identical the male parent? e. What fraction of the progeny will be homozygous at all seven loci? f. What fraction of the progeny will be heterozygous at all seven loci?

20. Based on the pedigree below, what do you know about individual II-3 and II-4? Examine the pedigree below. 1 11 111 IV DO 1 Figure 12-3 They have the disease They are both homozygous recesive *REQU They are both carriers They are both homozygous dominant

6.    A heterozygous purple plant is crossed with a white plant. A.    Write the genotype of the purple and white plants. B.    Write the gametes formed by the purple plant and proportions in which they occur.   C.    Write the gametes formed by the white plant and proportions in which they occur.   D.    Combine the gametes using a Punnett square.           E.    Write the genotypes of the offspring and the ratio in which they occur.     F.    Write the phenotypes of the offspring and the ratio in which they occur.       7.    The ability to roll your tongue (R) is dominant to lack of this ability (r). A.    What is the genotype of a man who can roll his tongue if his father couldn’t? B.    If a man who is heterozygous for tongue rolling marries a woman who is heterozygous, what would you predict for the genotypes and phenotypes of their children?                               8.     Huntington’s disease is a degenerative disease of the nervous system that strikes in middle age. The…