Introduction to Genetic Analysis
11th Edition
ISBN: 9781464109485
Author: Anthony J.F. Griffiths, Susan R. Wessler, Sean B. Carroll, John Doebley
Publisher: W. H. Freeman
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Chapter 1, Problem 1P
Summary Introduction
To determine: The type of progeny produced by crossing white-flowered parental variety and first-generation hybrid.
Introduction. Gregor Mendel was an Austrianmonk, who worked on a pea plant to observe the pattern of inheritance of certain characters from the parent plant to the offspring. He termed the genes as factors that were passing on from one generation to another. Based on this, he proposed three laws, which came to be known as Mendel’s law of genetics.
Expert Solution & Answer
Explanation of Solution
The cross made between the true-breeding white flower (rr) and first-generation hybrid(Rr) will produce red and white flowers. When this plant is crossed with a dwarf parent the progeny produced is as follows:
| Gametes | R | r |
| r |
Rr (red flower) |
rr (white flower) |
| r |
Rr (red flower) |
rr (white flower) |
The progeny produced from the cross will consist of 50% of white flowers and 50% red flowers.
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The crossing of two orange-flowering plants results in 61 orange-flower progeny and 27 white-flower progeny. The crossing of two orange-flowering F1 plants generates a similar progeny ratio as observed for the parental cross, while the crossing of white-flowering F1 plants only produces white-flowering progeny. What is a likely explanation for these results?
The crossing of two orange-flowering plants results in ~2/3 orange-flower progeny and ~1/3 white-flower progeny. The crossing of two orange-flowering F1 plants generates the same progeny ratios as observed for the parental cross, while the crossing of white-flowering F1 plants only produces white-flowering progeny. What is a likely explanation for these results?
If the white-flowered parental variety in Figure 1-3 werecrossed to the first-generation hybrid plant in that figure,what types of progeny would you expect to see and inwhat proportions?
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