Traits and Probability

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The inheritance of traits follows the rules of probability. Can you use Punnett squares to make predictions? Find your clue in your answers.

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Jean Wall

United States

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Traits and Probability

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Traits and ProbabilityVersion en ligne The inheritance of traits follows the rules of probability. Can you use Punnett squares to make predictions? Find your clue in your answers. par Jean Wall 1 In pea plants, the trait for tall stems is dominant over the trait for short stems. If two heterozygous tall plants are crossed, what percentage of the offspring would be expected to have the same phenotype as the parents? a 100% (up) b 75% ( left) c 50% (right) d 25% (down) 2 Hemophilia is a sex-linked, recessive trait. Which of the following describes the probability of hemophilia in the offspring of a man who does not have hemophilia (XH Y) and a woman (XH Xh) whose father is a hemophiliac? [Hint: Create a Punnett Square to determine your answer] a Their sons and daughters will have hemophilia. (left) b There is a 50% chance that their daughters will have hemophilia. (up) c Their sons have a 100% chance of having hemophilia. (right) d None of their daughters will have hemophilia. (down) 3 Hitchhiker's thumb (H) is dominant to no hitchhiker's thumb (h). A woman who does not have hitchhiker's thumb marries a man who is homozygous for hitchhiker's thumb. What is the probable genotypic ratio of their children? a 100% Hh: 0% hh (up) b 0% Hh: 100% hh (down) c 75% Hh: 25% hh (left) d 50% Hh: 50% hh (right) 4 In guinea pigs, black coat color (B) is dominant over white coat color (b) and short hair (S) is dominant over long hair (s). Based upon the dihybrid cross shown, what is the phenotype for letter X? a white coat, long hair (left) b black coat, long hair (up) c black coat, short hair (right) d white coat, short hair (down) 5 A certain type of flower has two alleles for color (blue, purple), and two alleles for stem height (tall, short). A tall blue flower and a short purple flower are crossed, resulting in tall blue flowers, short blue flowers, tall purple flowers, and short purple flowers. What law does this example demonstrate? a law of genetic inheritance (up) b law of independent assortment (left) c law of multiple alleles (down) d law of segregation (right)