4) The round pea seed allele (R) is dominant, while the wrinkled pea seed allele (r) is recessive. A heterozygous round-seeded pea plant is crossed with a wrinkle-seeded pea plant. Use a Punnett Square to solve the following: a. Determine the predicted genotype ratio of the offspring. b. Determine the predicted phenotype ratio of the offspring. c. If this cross produced 50 plants, how many plants would you predict would be wrinkle-seeded pea plants?

Assume that plant height is determined by a pair of alleles at each of two loci (A and a, B and b) that are additive in their effects.  Further assume that each allele represented by an uppercase letter contributes 6 feet to height and that each allele represented by a lowercase letter contributes 2 foot to height.  If a plant with genotype Aabb is crossed to a plant with genotype aaBb, what heights are expected in the progeny?     1/216ft : 1/2 12ft     1/4 16ft : 1/2 12ft : 1/4 8ft     1/4 20ft : 1/2 16ft : 1/4 12ft     1/4 24ft : 1/2 20ft : 1/4 16ft     1/2 20ft : 1/2 16ft

Tall (A) is completely dominant to short (a), and red (B) is completely dominant to white (b) in a certain species of flowering plants. If a testcross into ardihybrid (aabb x AaBb) results in a 1 tall and white :1 short and red phenotypic ratio, then: (Read each of the following statements carefully. Select all of the statements below that are true (that you agree with). Leave any statements that are false (that you do not agree with) un-selected.) O the two genes could be very far apart on the same chromosome. the dihybrid parent represented two genes that are independent and in trans configuration. half of the progeny are from segregation alone while the other half is from crossing over and then segregation: Ce dihybrid parent represented two genes that are linked and in cis configuration. U all of the progeny are parentals; no recombinants resulted from this cross. CS Scanned with CamScanner

Assume that a cross is made between a heterozygous tall pea plant and a homozygous short pea plant. Fifty offspring are produced in the following frequency:             32 = tall; 18 = short   (a) What frequency of tall and short plants is expected?  (b) Compute a Chi-square value associated with the appropriate test of significance. (c) How should this result be interpreted regarding the null hypothesis?

In tomatoes, dwarf (d) is recessive to tall (D), opaque leaves (g) are recessive to green leaves (G) and fascinated fruit (f) is recessive to normal fruit (F). A tomato plant heterozygous for all three traits is used in a testcross, and the following progeny are produced. Below are the specific alleles each offspring received from the heterozygous parent. DUDUD d d d d D Total: F f f f F F F f G G G 00 00 00 00 g g G 6 210 63 12 246 63 39 51 690 a. Determine the order of these genes on the chromosome. b. Calculate the map distances between the genes and draw the map. c. Determine the amount of interference among these genes. d. Write the genotypes of the parents used in the testcross using the correct notation.

In the table, parent is on the left side with F1 phenotypes of 600 progeny on the right

In classical Mendelian genetics, how can one check the genotype of a parent (A) expressing the characters of a dominant allele?   Select one: a. By performing a back cross with a recessive homozygote parent (B). If the A parent is homozygote for the dominant allele, then all the individuals from the F1 will display the dominant character. If the parent A was, instead, a heterozygote, then 50% of the F1 progeny will express the recessive character (homozygote recessive) and 50% the dominant one (heterozygotes). b. It is impossible to check such genotype without using specific molecular assays. c. By performing a back cross with a dominant homozygote parent (B). If the A parent is homozygote for the dominant allele, then all the individuals from the F1 will display the dominant character.

Red-flowering snapdragons are homozygous for allele R1. White-flowering snapdragons are homozygous for  a different allele (R2). Heterozygous plants (R1R2) bear pink flowers. What phenotypes should appear among first-generation offspring of the crosses listed? What are the expected proportions for each phenotype? a. R1R1 × R1R2 c. R1R2 × R1R2 b. R1R1 × R2R2 d. R1R2 × R2R

Complete the punnett square below for a cross between AA and aa A 21 a QUESTION 4 A Aa Complete the punnett square below for a cross between Aa and Aa. 03 Aa Aa

A purple snow pea plant known to be hybrid for three linked genes (a, b, and d) is testcrossed. The progeny phenotypes and frequencies are: +a+ 86 b+d 56 +ad 78 b++ 49 +++ 12 bad 6 ba+ 515 ++d 460   a) Draw the chromosomes of the trihybrid and tester lined mentioned above.  b) Give a map of the gene order with distance.