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Concepts of Genetics

Biology

Quiz 3 :

Mendelian Genetics

Quiz 3 :

Mendelian Genetics

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Assume that you have a garden and some pea plants have solid leaves and others have striped leaves. You conduct a series of crosses [(a) through (e)] and obtain the results given in the table. Define gene symbols and give the possible genotypes of the parents of each cross. img
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Answer:

(a) From cross (d), assume that solid (S) is dominant to striped (s): Ss × ss. (b) SS × SS or SS × Ss (c) ss × ss (d) Ss × Ss (e) SS × ss

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According to Mendel's model, because of the ________ of chromosomes during meiosis, all possible combinations of gametes will be formed in equal frequency.
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independent assortment

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In peas, gray seed color is dominant to white. For the purposes of this question, assume that Mendel crossed plants with gray seeds with each other and the following progeny were produced: 320 gray and 80 white. a) What is the most probable genotype of each parent? a) What genotypic and phenotypic ratios are expected in the progeny of such a cross?
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(a) assuming the following symbols: G = gray and g = white, Gg × Gg
(b) genotypic = 1:2:1, phenotypic = 3:1

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Polydactyly is expressed when an individual has extra fingers and/or toes. Assume that a man with six fingers on each hand and six toes on each foot marries a woman with a normal number of digits. Having extra digits is caused by a dominant allele. The couple has a son with normal hands and feet, but the couple's second child has extra digits. What is the probability that their next child will have polydactyly?
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The Chi-square test involves a statistical comparison between measured (observed) and predicted (expected) values. One generally determines degrees of freedom as ________.
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According to Charles Darwin and Alfred Wallace, variations followed a more continuous pattern. According to Mendel's model, variation due to dominance-recessive relationships followed a more ___________ form.
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Which types of phenotypic ratios are likely to occur in crosses when dealing with two gene pairs for which all the genotypic combinations are of equal viability?
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Dentinogenesis imperfecta is a rare, autosomal, dominantly inherited disease of the teeth that occurs in about one in 8000 people (Witkop 1957). The teeth are somewhat brown in color, and the crowns wear down rapidly. Assume that a male with dentinogenesis imperfecta and no family history of the disease marries a woman with normal teeth. What is the probability that a) their first child will have dentinogenesis imperfecta? b) their first two children will have dentinogenesis imperfecta? c) their first child will be a girl with dentinogenesis imperfecta?
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Which types of phenotypic ratios are likely to occur in testcrosses when dealing with two gene pairs for which all the genotypic combinations are of equal viability?
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Which types of phenotypic ratios are likely to occur in crosses when dealing with three gene pairs for which all the genotypic combinations are of equal viability?
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Which of the following groups of scientists were influential around the year 1900 in setting the stage for our present understanding of transmission genetics?
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Albinism, lack of pigmentation in humans, results from an autosomal recessive gene (a). Two parents with normal pigmentation have an albino child. a) What is the probability that their next child will be albino? b) What is the probability that their next child will be an albino girl? c) What is the probability that their next three children will be albino?
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Tightly curled or wooly hair is caused by a dominant gene in humans. If a heterozygous curly-haired person marries a person with straight hair, what percentage of their offspring would be expected to have straight hair?
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Name the single individual whose work in the mid-1800s contributed to our understanding of the particulate nature of inheritance as well as the basic genetic transmission patterns. With what organism did this person work?
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Assume that a black guinea pig crossed with an albino guinea pig produced 5 black offspring. When the albino was crossed with a second black guinea pig, 4 black and 3 albino offspring were produced. What genetic explanation would apply to these data?
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What meiotic process, relative to the number of chromosomes of a given species, accounts for a significant amount of genetic variation in gametes?
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Assume that in a series of experiments, plants with round seeds were crossed with plants with wrinkled seeds and the following offspring were obtained: 220 round and 180 wrinkled. a) What is the most probable genotype of each parent? b) What genotypic and phenotypic ratios are expected? c) Based on the information provided in part (b), what are the expected (theoretical) numbers of progeny (400 total) of each phenotypic class?
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A recessive allele in tigers causes the white tiger. If two normally pigmented tigers are mated and produce a white offspring, what percentage of their remaining offspring would be expected to have normal pigmentation?
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Which types of phenotypic ratios are likely to occur in crosses when dealing with a single gene pair for which all the genotypic combinations are of equal viability?
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The fundamental Mendelian process that involves the separation of contrasting genetic elements at the same locus would be called ________.
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