## 10.2 Activity

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nikateke  on January 26, 2012

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# 10.2 Activity

 What was the result when Mendel crossed true-breeding purple flowers with white flowers?All the offspring were purple.
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#### Definitions

What was the result when Mendel crossed true-breeding purple flowers with white flowers? All the offspring were purple.
If "blending inheritance" were true, what would you expect the outcome to be when purple flowers are crossed with white flowers? All the offspring would produce pale purple flowers.
Are the purple flowers from the F1 generation and purple flowers from the P generation identical? Explain. They appear to be identical, but they are genetically different.
If the "blending hypothesis of inheritance" was true, what offspring would you expect to find in the F2 generation? If the blending hypothesis of inheritance was true, any purple-flowered plant crossed with another purple-flowered plant would produce all purple-flowered offspring. The blending theory show that purple x purple plants, regardless of the generation, would produce purple plants
If Mendel counted 232 offspring from the F1 x F1 cross between pea plants for flower color, about how many do you predict would be white? Purple? 58; 174
In the flower cross, the Punnett square indicates that in the F2 generation, one quarter of the flowers are likely to be white. If Mendel counted 928 F2 plants, about how many white-flowered plants would be expected? Mendel should have expected to 232 (one quarter of 928). In fact, Mendel observed 224 white flowered plants. But the rules of chance play a role, and this explains the small difference between the expected number and the observed number.
Suppose you breed corn plants and find that purple kernels (K) are dominant to yellow kernels (k). If you cross two hybrid plants (Kk x Kk), and get 1,000 F2 corn plants, about how many would you expect to be true-breeding (KK) for purple kernels 250
Would you be able to differentiate between the true-breeding purple kernel plants (PP) and the hybrids (Pp)? Explain No, they would look identical
Crossing an organism with the dominant trait and an organism the recessive trait is called a "testcross." How is a testcross useful? Geneticists can test whether the parent with the dominant trait is either pure-breeding (for example, AA) or a hybrid (for example, Aa).
Predict the offspring produced from a cross between a true-breeding longhaired rabbit and a shorthaired rabbit. All the offspring would have short hair.
Predict the offspring produced from a cross between a hybrid shorthaired rabbit and a longhaired rabbit. There would be both long and shorthaired offspring in a 1:1 ratio

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