Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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- In Thomas Hunt Morgan's experiments examining the transmission of eye color in fruit-flies, he observed that when he crossed heterozyYgous red-eyed females to red-eyed males, 1/2 of the male offspring were white-eyed, while all of the female offspring are red-eved, Which of the following best explains the results? 1/2 of the male offspring inherit a white-eye color allele from their heterozygous mothers. Since there is no eye color gene on the Y chromosome, their eyes are white. 1/2 of the male offspring inherit a Y-chromosome from their fathers. Since there is no eye color gene on the Y chromosome, their eyes are white. All of the female offspring inherit a dominant, red-eyed allele from their mothers A 3 to 1 ratio of dominant to recessive offspring are expected in a single factor crossarrow_forwardIn classical Mendelian genetics, how can one check the genotype of a parent (A) expressing the characters of a dominant allele? Select one: a. By performing a back cross with a recessive homozygote parent (B). If the A parent is homozygote for the dominant allele, then all the individuals from the F1 will display the dominant character. If the parent A was, instead, a heterozygote, then 50% of the F1 progeny will express the recessive character (homozygote recessive) and 50% the dominant one (heterozygotes). b. It is impossible to check such genotype without using specific molecular assays. c. By performing a back cross with a dominant homozygote parent (B). If the A parent is homozygote for the dominant allele, then all the individuals from the F1 will display the dominant character.arrow_forwardIn watermelons there is a gene for colour and a gene for shape located on different chromosomes. The alleles for green colour and for short shape are dominant over their alleles for striped colour and for long shape. Suppose a plant with long striped fruit is crossed with a plant heterozygous for both these characters. What phenotypes would this cross produce and in what ratios?arrow_forward
- Two genes are found in a chameleon, one for camouflage (dull colors dominant to vibrant colors) and another for muscle strength (strong dominant to weak), which seem to follow basic Mendelian inheritance patterns. To determine if they are linked, you set up a testcross and got the following results: Phenotype Dull colors; Strong Dull colors; Weak Number of Progeny 98 76 Vibrant colors; Strong 72 Vibrant colors; Weak 105 Did you start this experiment with the genes in coupling or repulsion? (Be sure you know how to run the chi-square based off this information as well!) O Coupling O Cannot determine with this information O Repulsionarrow_forwardMendel examined two distinct flower phenotypes in his pea plants. Flower color and flower position. The violet color (W) is dominant over the white color (w), and the axial position (T) is dominant over terminal (t). Predict the F1 ratios of these phenotypes from a parent heterozygous for both traits and the other parent homozygous recessive for both traits. Show your work. Flower color Flower position violet/white axial/terminalarrow_forwardFruit color in eggplants is controlled by a single autosomal gene, R, with two alleles R and r When a homozygous plant that produces purple fruit (RR) is crossed with a homozygous plant that produces white fruit (rr), all F1 offspring produce violet eggplants. When the F1 progeny are testcrossed, the F2 progeny produce 160 violet eggplants, and 154 white eggplants. Design a hypothesis for the mode of inheritance of eggplant color (explicitly state your null and alternate hypotheses). Test this hypothesis using a chi-squared test. Use the chi-squared critical value table provided to determine the outcome of your statistical test. Explain the results obtained (i.e. interpret the p-value).arrow_forward
- In rabbits, black fur (F) is dominant to white fur (f). You decide to cross a rabbit that is homozygous dominant for fur color with a rabbit that is heterozygous for fur color. Set up a Punnett Square for this cross and then answer the following questions. What percentage of offspring will have the [ Choose ] FF phenotype? What percentage of offspring will have the ff [ Choose ] phenotype? What percentage of offspring will have the Ff [ Choose ] phenotype? > > >arrow_forwardWithin a mouse population, the black fur allele (B) is dominant to the white fur allele (b) and the short whisker allele (S) is dominant to the long-whisker allele (s). A heterozygous black-furred short-whiskered mouse is crossed with a homozygous white-furred long-whiskered mouse. What percentage of the offspring will be black-furred with long whiskers?arrow_forwardGive typed explanation In pea plants, the tall allele (T) is dominant to the dwarf allele (t) and the yellow pea color allele (Y) is dominant to the green pea color allele (y). Cross TtYy with Ttyy. What would be the genotype and phenotype ratios in their offspring? (Please include the gametes produced by each parent.)arrow_forward
- It has been hypothesized that people who are heterozygous for the allele that causes the deadly genetic condition cystic fibrosis (which, among other symptoms, reduces fertility) are more resistant to the deadly disease tuberculosis. Question - if the cystic fibrosis allel protects against tuberculosis the same what the sickle cell allele protects against malaria, then which of the following should be true in comparison between regions with or with out TB. -cystic fibrosis deaths should be more common in regions with tb - CYSTIic fibrosis deaths should be less common in regions with tb - CYSTIic fibrosis deaths should be equally common in regions with tb -Regional differences in the cystic fibrosis death rate should be purly random and upredictable.arrow_forwardThe gene 'aggregate' (ag) is located 4 map units from gene blotched (bl). You are going to collect 1000 offspring. a. How many offspring of the 1000 you collect would you expect to be recombinant from a heterozygous ag+ag/ bl+bl and a homozygous recessive aggregate/blotched cross? b. If ag and bl are linked, what genotypes would represent the largest number of offspringarrow_forwardA cross is performed between individuals with the following genotypes: Aabb and aaBb. Use a Punnett square and predicted probabilities to answer the following questions. A. What is the probability that an offspring is dominant for the first trait and recessive for the second? B. What is the probability that an offspring is dominant for both traits? C. What is the probability that two offspring are dominant for both traits?arrow_forward
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