Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 12.1, Problem 2SB
If, instead, the four
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Individuals of genotype AaBb were mated to individuals of genotype aabb. One thousand offspring were counted, with the following results: 474 Aabb, 480 aaBb, 20 AaBb, and 26 aabb. What type of cross is it? Are these locilinked? What are the two parental classes and the two recombinant classes of offspring? What is the percentage of recombination between these two loci? How many map units apart are they?
in three points mapping one parent has the A+C/+b+ genotype that was crossed to a homozygous recessive second parent.
a)what is the genotype of this second parent?
b)what are the genotypes of the double cross over offspring?
What is the genotype of the F1 generation of the corn dihybrid cross described above?
What is the phenotype of the F1 generation of the corn dihybrid cross described above?
What are the possible maternal and paternal genotypes of the F1 gametes of the corn dihybrid cross described above?
Chapter 12 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 12.1 - Two pairs of traits are segregating in a cross....Ch. 12.1 - If, instead, the four phenotypes in question 1...Ch. 12.2 - Palomino horses have a golden coat color, with a...Ch. 12.2 - A true-breeding rabbit with agouti (mottled,...Ch. 12 - The dominant C allele of a gene that controls...Ch. 12 - In peas, the allele Le produces tall plants and...Ch. 12 - Prob. 3TYKCh. 12 - What genotypes, and in what frequencies, will be...Ch. 12 - In addition to the two genes in problem 4, assume...Ch. 12 - Prob. 6TYK
Ch. 12 - In cats, the genotype AA produces tabby fur color;...Ch. 12 - Prob. 8TYKCh. 12 - The ability of humans to taste the bitter chemical...Ch. 12 - A man is homozygous dominant for alleles at 10...Ch. 12 - In guinea pigs, an allele for rough fur (R) is...Ch. 12 - Prob. 12TYKCh. 12 - Some recessive alleles have such a detrimental...Ch. 12 - In chickens, feathered legs are produced by a...Ch. 12 - A mix-up in a hospital ward caused a mother with O...Ch. 12 - Having malformed hands with shortened fingers is a...Ch. 12 - Prob. 17TYKCh. 12 - Design an Experiment Imagine that you are a...Ch. 12 - Prob. 19TYKCh. 12 - Prob. 1ITDCh. 12 - Prob. 2ITDCh. 12 - Half of the worlds population eats rice at least...
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- Given the karyotype shown at right, is this a male or a female? Normal or abnormal? What would the phenotype of this individual be?arrow_forwardFigure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are dominant to green (y). What are the possible genotypes and phenotypes for a cross between PpYY and ppYy pea plants? How many squares would you need to complete a Punnett square analysis of this cross?arrow_forwardIn a cross involving independently assorting loci, the cross BBYY x bbyy (assume "B" and "Y" are dominant to "b" and "y," respectively) will yield all dihybrid offspring. When those offpspring are crossed, the result is usually a 9:3:3:1 phenotypic ratio. But what if the locus "B" and "Y" did not sort independently (i.e., they were linked, at least partially)? It would mean "BY" and "by" are now more likely. How would this specifically affect the expected 9:3:3:1 ratio? To be more clear, which one of these numbers in the ratio (9, 3, 3, and/or 1) would be expected to decrease? Question 3 options: the 9 would decrease both 3's would decrease one of the 3's would decrease the 1 would decreasearrow_forward
- A cross was made between a black male dog and two different white females. The first female gave birth to eight white pups, and the second female gave birth to two white and three black pups. What are the likely genotypes of the male parent and the two female parents?arrow_forwardYou perform a cross between a parent with the genotype WWiiNNttEErr and another parent that is wwllnnTTeerr. All genes are unlinked except for W and I which are 22 mu apart. You take an F1 from this cross and cross it with an individual that is wwiiNntteerr. a) What is the probability that this final cross yields an offspring that is wwiinntteerr? b) What is the probability that this final cross yields an offspring that is NNTT or Nntt. (You can ignore all of the other genes for this question.)arrow_forwardWhat is the genotype of the F1 generation of the corn monohybrid cross described above? What is the phenotype of the F1 generation of the corn monohybrid cross described above? What are the possible maternal and paternal genotypes of the F1 gametes of the corn monohybrid cross described above? What is the genotype of the parents of the corn dihybrid cross described above? What are the phenotypes of the parents of the corn dihybrid cross described above? What are the possible genotypes of the parent gametes of the corn dihybrid cross described above? What is the genotype of the F1 generation of the corn dihybrid cross described above? What is the phenotype of the F1 generation of the corn dihybrid cross described above? What are the possible maternal and paternal genotypes of the F1 gametes of the corn dihybrid cross described above?arrow_forward
- How many different kinds of F1 gametes, F2 genotypes, and F2 phenotypes would be expected from the following crosses: (a) AA x aa; (b) AA BB x aa bb; (c) AA BB CC x aa bb cc? (d) What general formulas are suggested by these answers?arrow_forwardIf 2 spot (S) is dominant to 4 spot (s), give the genotypes for the parents in the following crosses: 2 spot × 2 spot yields 2 spot and 4 spot 2 spot × 4 spot yields only 2 spot 2 spot × 4 spot yields 2 spot and 4 spot 2 spot × 2 spot yields only 2 spot 4 spot × 4 spot yields only 4 spotarrow_forwardAssume that the trihybrid cross AABBrr x aabbRR is made in a plant species. Assume that A and B are dominant alleles, but there is no dominance effect of alleles at the R locus. a) How many different gametes are possible in the F1generation? What are the genotypes of these gametes? b) What is the probability of the parental aabbRR genotype in the F2 progeny? c) What proportion of the F2 progeny would be expected to be homozygous for all three genes?arrow_forward
- In pea plants, purple flowers (P) are dominant to white flowers (p) and yellow peas (Y) are dominant to green peas (y). What are the possible genotypes and phenotypes for a cross between PpYY and ppYy pea plants? How many squares do you need to do a Punnett square analysis of this cross?arrow_forwardBut for part A if you cross dd ll x DD LL, won't all the offspring be DdLl (dark colored and long legged), so wouldn't NONE of the offpspring have short legs and light body coloration? Isn't the 9:3:3:1 ratio only for two heterozygous dihybrid crosses? Where is the 25/4 coming from? Could you draw a punnett square to demonstrate.arrow_forwardHow much genotypic variation do you find in the randomly picked parents of your crosses?arrow_forward
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