Concept explainers
Determine whether the statements below are true or false. If a statement is false, provide the correct information or revise the statement to make it correct.
a. If a dihybrid cross is performed, the expected genotypic ratio is
b. A student uses the product rule to predict that the probability of flipping a coin twice and getting a head and then a tail is
c. A test cross between a heterozygous parent and a homozygous recessive parent is expected to produce a 1:1 genotypic and phenotypic ratio.
d. The outcome of a trihybrid cross is predicted by the law of segregation.
e. Reciprocal crosses that produce identical results demonstrate that a strain is pure-breeding.
f. If a woman is heterozygous for albinism, an autosomal recessive condition that results in the absence of skin pigment, the proportion of her gametes carrying the allele that allows pigment expression is expected to be 75%.
g. The progeny of a trihybrid cross are expected to have one of 27 different genotypes.
h. If a dihybrid F1 plant is self-fertilized,
(1)
(2)
(3)
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Study Guide And Solutions Manual For Genetic Analysis: An Integrated Approach
- Give typing answer with explanation and conclusion Directions: For the following problem, calculate the probability of the offspring between the cross using the sum and product rule. The parent generation has genotypes of Aa Bb Cc and AA Bb CC. What is the probability the F1 generation would be AA bb cc?arrow_forwardUse the image below to answer the following questions. Label the genotypes for ALL the family members in the pedigree above. Remember to use XX and XY when labeling. What does it mean to be a carrier? Why does Alexis have hemophilia? Is hemophilia a sex-linked disease? What does that mean and how does this pedigree show you this?arrow_forwardIn one of Mendel’s dihybrid crosses, he observed315 round, yellow; 108 round, green; 101 wrinkled,yellow; and 32 wrinkled, green F2 plants. Analyze thesedata using the x2 test to see if(a) they fit a 9:3:3:1 ratio.(b) the round:wrinkled data fit a 3:1 ratio.(c) the yellow:green data fit a 3:1 ratio.arrow_forward
- Suppose that in barley plants, the allele for tall stalks is dominant over short stalks and the allele for wide leaves is dominant over thin leaves. What would be the best way to determine the genotype of a barley plant with a tall stalk and wide leaves? Choose 1 answer: A.Perform a testcross with a barley plant that has a tall stalk and thin leaves. B.Perform a testcross with a known heterozygous barley plant . C. Perform a testcross with a barley plant that has a short stalk and thin leaves. D. Perform a testcross with a barley plant that has a tall stalk and wide leaves.arrow_forwardThe forked line and probability methods make use of what probability rule? a. test cross b. product rule c. monohybrid rule d. sum rulearrow_forwardA test was done to determine the biological father of a child. The child's blood type is A and the mother's is B. The first man has a blood type of O, while the second has a blood type of AB. Which among the two men could possibly be the biological father? Use a cross of various genotypes. Additional Questions: Construct a punnect square Offspring’s possible genotype? Parent 1’s possible genotype? Parent 2’s possible genotype? Possible cross?arrow_forward
- Give only typing answer with explanation and conclusion You want to cross horses. We will denote the allele for black coat as B and the allele for the brown coat b. You crossed two heterozygous horses and obtain a black horse. What is the probability that this black horse is homozygous dominant (BB)? Group of answer choices 1/2 0 1 1/3 1/4arrow_forward. A man with a blood type AB is married to a woman with blood type A. They have natural children and one adopted child. These are the children with their blood type: Baltazar has blood type A, Melchor has blood type AB and Melchor has blood type O. a. Who was adopted? b. What genetic problem is this? (monohybrid, dihybrid or multiple allele) c. Show the Punnett square.arrow_forwardGive typing answer with explanation and conclusion "B"-yellow "b"-green. When 2 heterozygous parents for both traits are crossed it's called a dihybrid cross- AaBb × AaBb. Fill in the Punnett Square with the genotypes of this cross.arrow_forward
- Assume that one of the students in your class is homozygous for the “Type A” allele and the other student is homozygous for the “Type B” allele. What blood type(s) would you expect to see in their offspring? What if the second was instead “Type O”? Cross two individuals who both have Type AB blood. What are the expected genotypic and phenotypic ratios in their offspring? PTC paper placed in your mouth can determine if you are a “taster” or a “non-taster”? Let's assume that you are a "taster". What possible genotypes could produce your phenotype? If you produced children with a "non-taster", what genotypic and phenotypic ratios would be expected in your offspring?arrow_forwardYou inspect an ear of corn and find the following number of kernels: 461 red and starch, 142 red and sweet, 156 yellow and starchy and 53 yellow and sweet. a. What genotype did the parent corn plants probably have? b. Support your answer by working out the cross with a Punnett squarearrow_forwardConsider a cross between a pea plant that is heterozygous for round seeds and a pea plant that has wrinkled seeds. The allele for round seeds (R) is dominant over that for wrinkled seeds (r). Using a Punnett square, determine the genotypes of the offspring.arrow_forward
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