If you cross RrYy and RRyy pea plants, what fraction of the offspring will have round peas? R=round, r=wrinkled, Y=yellow, y=greenMultiple Choice50%75%100%25%0%
Question
If you cross RrYy and RRyy pea plants, what fraction of the offspring will have round peas? R=round, r=wrinkled, Y=yellow, y=greenMultiple Choice50%75%100%25%0%
Solution
To solve this problem, we need to understand the basics of Mendelian genetics.
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First, let's identify the genotypes of the parent plants. The first plant is RrYy (round and yellow peas) and the second plant is RRyy (round and green peas).
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The trait for pea shape is determined by the 'R' and 'r' alleles. 'R' is dominant and codes for round peas, while 'r' is recessive and codes for wrinkled peas.
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The first plant can produce two types of gametes with respect to the trait for pea shape: 'R' and 'r'. The second plant can only produce one type of gamete: 'R' (since it's homozygous dominant for this trait).
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When we cross these plants, every possible combination of gametes will result in at least one 'R' allele. This means that every offspring will have the dominant 'R' allele and therefore have round peas.
So, the answer is 100% of the offspring will have round peas.
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