1) In a different plant species from the example given, flower color is controll
ID: 82837 • Letter: 1
Question
1) In a different plant species from the example given, flower color is controlled by two genes that contribute equally to pigmentation in the final flower color. The more "R" alleles, the more pigmentation, such that only plants with the genotype CRCR DRDR have red flowers, and only plants with the genotype CWCW DWDW have white flowers. Plants with three "R" alleles produce 75% as much pigmentation as CRCR DRDR plants and have dark pink flowers. Plants with three "W" alleles produce 25% as much pigmentation as CRCR DRDR plants and have light pink flowers. Plants with an equal number of "R" and "W" alleles produce 50% as much pigmentation as CRCR DRDR plants and have pink flowers. A red flowering plant was mated to a white flowering plant and all of the F1 progeny had pink flowers. These pink flowered F1 plants were allowed to self-fertilize to produce F2 progeny. What is the genotype of the F1 plants that produced pink flowers? (Hint: draw Punnett squares to determine the F1 and F2 genotypes and phenotypes.)
A) CWCW DRDR
B) CRCW DRDW <------------------- This is my answer
C) CWCR DRDR
D) CRCR DWDW
2) Referring to the crosses described in the previous question, how many different flower colors will be present in the F2 population?
A) 3
B) 5 <-------------------- This is my answer
C) 4
D) 6
3) Referring to the crosses described in the previous questions, what is the phenotypic ratio of the F2plants? (Hint: draw Punnett squares to determine the F1 and F2 genotypes and phenotypes.) rev: 11_15_2012
A) 9:4:3
B) 9:3:3:1
C) 6:4:4:1:1
D) 12:3:1
4) Referring to the crosses described in the previous questions, what genotypes in the F2 population will produce pink flowers (flowers that are true pink, not dark pink or light pink)?rev: 11_15_2012
A) CRCW DRDW, CRCR DRDW, CWCW DWDR
B) CRCW DWDW, CWCW DRDW
C) CRCW DRDW, CRCR DWDW, CWCW DRDR
D) CRCR DRDW, CWCR DRDR
5) Referring to the crosses described in the previous questions, what genotypes in the F2 population will produce dark pink flowers?
A) CRCR DRDW, CWCR DRDR
B) CRCW DRDW, CRCR DRDW, CWCW DWDR
C) CRCW DRDW, CRCR DWDW, CWCW DRDR
D) CRCW DWDW, CWCW DRDW
6) Referring to the crosses described in the previous questions, what genotypes in the F2 population will produce light pink flowers?
A) CRCW DRDW, CRCR DWDW, CWCW DRDR
B) CRCW DWDW, CWCW DRDW
C) CRCW DRDW, CRCR DRDW, CWCW DWDR
D) CRCR DRDW, CWCR DRDR
Mc Graw Incomplete Dominance Hill Example: Red White Pink Flower Color Please choose two genotypes below by dragging them into the parent cells at right. Red Pink White CRC CRC CWC What is the expected What is the expected phenotype ratio? genotype ratio? CRcR red Row white pink Clear help submit Copyright OThe McGraw-Hill Companies, Inc.Explanation / Answer
Ans 1: b
Pink colour appears as a result of cross-pollination between a red flower and a white flower when neither the white nor the red alleles are dominant. In a cross between a red and white flower, the genotype for red CRCR, and for a white flower is CWCW, neither allele is dominant. The heterozygous progeny have pink flowers and the genotype CRCW. If two of these heterozygotes are crossed, the phenotypes of their progeny occur in a ratio of 1:2:1 (red:pink:white).
Ans 2: 3
Self-pollination of the F1 offspring produces 25% white, 25% red, and 50% pink F2 offspring.
Ans 3: 9:3:3:1
Ans 4: c
Ans 5: a
Ans 6: b
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