Campbell Biology (11th Edition)
11th Edition
ISBN: 9780134093413
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 13.4, Problem 2CC
The diploid number for fruit flies is 8, and the diploid number for grasshoppers is 46. If no crossing over took place, would thc
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In fruit flies, the allele for normal wings (V) is dominant to the allele for short wings (v). Suppose two fruit flies heterozygous for the trait are mated.
What is the male fruit fly’s genotype and the female fruit fly’s genotype?
What is the male fruit fly’s phenotype and the female fruit fly’s phenotype?
What will be the genotypic ratio of the F1 generation?
What will be the phenotypic ration of the F1 generation?
The recessive allele s causes Drosophila to have small wings, and the s+ allele causes normal wings. This gene is known to be X linked. If a small-winged male is crossed with a homozygous wild-type female, what ratio of normal to small-winged flies can be expected in each sex in the F1? If F1 flies are intercrossed, what F2 progeny ratios are expected? What progeny ratios are predicted if F1 females are backcrossed with their father?
If a diploid cell entering meiosis has 12 chromosome pairs, what is the number of possible chromosomes at the end of meiosis?
Chapter 13 Solutions
Campbell Biology (11th Edition)
Ch. 13.1 - MAKE CONNECTIONS Using what you know of gene...Ch. 13.1 - How does an asexually reproducing eukaryotic...Ch. 13.1 - WHATIF? A horticulturalist breeds orchids, trying...Ch. 13.2 - MAKE CONNECTIONS In Figure 13.4. how many DNA...Ch. 13.2 - VISUAL SKILLS In The karyotype shown in Figuro...Ch. 13.2 - WHAT IF? A certain eukaryote lives as a...Ch. 13.3 - MAKE CONNECTIONS Comparc tho chromosomes in a...Ch. 13.3 - WHAT IF? After the synaptonemal complex...Ch. 13.4 - What is the original source of Variation among the...Ch. 13.4 - The diploid number for fruit flies is 8, and the...
Ch. 13.4 - Prob. 3CCCh. 13 - Explain why human offifuing resemble their parents...Ch. 13 - Compare the life cycles of animals and plants,...Ch. 13 - Prob. 13.3CRCh. 13 - Prob. 13.4CRCh. 13 - A human cell containing 22 autosomes.and a Y...Ch. 13 - The two homologs of a pair move toward opposite...Ch. 13 - Meiosis II is similar to mitosis in that (A)...Ch. 13 - Prob. 4TYUCh. 13 - If we continue to follow the cell lineage from...Ch. 13 - DRAW IT The diagram shows a cell in meiosis. (a)...Ch. 13 - Explain how you can tell that the cell in question...Ch. 13 - EVOLUTION CONNECTION Many species can reproduce...Ch. 13 - SCIENTIFIC INQUIRY The diagram in quest ion 6...Ch. 13 - Prob. 10TYUCh. 13 - SYNTHESIZE YOUR KNOWLEDGE For selected answers,...
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- Butterflies have an X-Y sex-determination system that is different from that of flies or humans. Female butterflies may be either XY or X0, while butterflies with two or more X chromosomes are males. This photograph shows a tiger swallowtail gynandromorph, which is half male (left side) and half female (right side). Given that the first division of the zygote divides the embryo into the future right and left halves of the butterfly, propose a hypothesis that explains how nondisjunction during the first mitosis might have produced this unusual-looking butterfly. Question is also in the picture.arrow_forwardIn fruit flies, gray body (G) is dominant to black body (g). If a male with a black body mates with a female that is homozygous dominant for her gray body what are the possible genotypes and phenotypes of their offspring? Complete the Punnett square below. What is the expected phenotypic ratio among the offspring?arrow_forwardThe chromosomes in the illustration below are found in a male betta fish and carry the gene for determining a trait in the tail of the betta fish. In betta fish, single tails are domi- nant to double tails. During meiosis, when gametes are formed, the male fish can only pass on one allele for the tail trait to each gamete. In a male fish that happens to be heterozy- gous, a gamete can only inherit the dominant allele on chromosome 1 or the dominant al- lele on chromosome 2. A An illustration of paired homologous chromosomes. B centromere с D Which of Mendel's laws best explains how the male fish can only pass on one allele to each gamete? paired homologous chromosomes Law of Independent Assortment Law of Segregation Law of Dominance chiasma Law of multiple alleles homologous chromosome 1 homologous chromosome 2arrow_forward
- A cross is carried out between two pure lines of tomato plants, one having regular leaves and red fruit and the other having potato leaves and yellow fruit. The F1 generation all have regular leaves and red fruit. The F1 individuals are then crossed with one another. Question text The expected phenotypic ratio for leaf shape and fruit colour genes is 9:3:3:1, if both genes are on different chromosomes and assort independently during gamete formation. The information below represents two sets of data collected from the above cross. Data Set 1 is from a population of 5000 tomato plants and Data Set 2 is from a population of 50 tomato plants. Phenotypes Observed Probabilities Data Set 1(N = 5000) Data Set 2(N = 50) Regular Red 0.58 0.050 Regular Yellow 0.16 0.29 Potato Red 0.20 0.050 Potato Yellow 0.060 0.61 A. Compare both data sets to the expected probabilities. Are there any significant differences between the observed results and the expected…arrow_forwardIn humans, hemophilia is a recessive trait carried on the X chromosome. Imagine that a couple, Mike and Anisha, have a daughter with hemophilia with the unusual karyotype of 45, X. Anisha's maternal uncle also had hemophilia. Where could an error in meiosis have occurred that would have given rise to this colour-blind daughter with only one X chromosome? 1. Non-disjunction in Mike at Meiosis I 2. Non-disjunction in Anisha at Meiosis I 3. Non-disjunction in Mike at Meiosis II 4. Non-disjunction in Anisha at Meiosis II O 2 and 4 O 4 only O 1, 2 and 3 O 1 and 3 O 1,2,3, and 4arrow_forwardIn C. elegans, lon-2 and unc-2 are recessive mutations that are 8 map units apart on the X chromosome. An hermaphrodite who is Lon and Unc is mated to a wild-type male. An F1 hermaphrodite is mated to a wild-type male. What are the expected percentages of the different phenotypes among the male progeny?arrow_forward
- Identify two ways meiosis contributes to genetic recombination? Why is it necessary to reduce the number of chromosomes in gametes? Blue whales have 44 chromosomes in every cell. Determine how many chromosomes you would expect to find in the following: Cachalot whale Egg cell Daughter cell from mitosis Daughter cell from mitosis IIarrow_forwardThe duck-billed platypus has a unique mechanism of sex determination: females have five pairs of X chromosomes (X1X1X2X2X3X3X4X4X5X5) and males have five pairs of X and Y chromosomes (X1Y1X2Y2X3Y3X4Y4X5Y5). Do you think each of the X and Y chromosome pairs in males assorts independently of other X and Y pairs during meiosis? Why or why not?arrow_forwardNon disjunction occurs when chromosomes fail to separate during meiosis, resulting in an abnormal number of chromosomes in the gametes. Assume an animal species has a diploid number of 4. Describe and/or show what the normal gametes would be like, and what would result from non disjunction in meiosis one, and what would result from non disjunction in meiosis two. You may use a drawing as part of your answer, but a drawing alone is not sufficient.arrow_forward
- We say that genes that are close together on the same chromosome are linked. What does that mean? Imagine that in a diploid nucleus, one chromosome has the allele R and right next to it on the same chromosome is the allele T for a different gene. Are these linked? Imagine that r is right next to t on the homologous chromosome. If this cell never undergoes meiosis, does this matter at all? If it does undergo meiosis, what are the two genotypes that the gametes are most likely to have? Look at Figure for help if you need it.arrow_forwardWhat is the correct table in these two given? 1. Take two coins and assume that heads represent the dominantallele (A) and tails represents the recessive allele (a). The genotype for each coin isheterozygous (Aa).2. Assume that each coin represents one parent. When a single coin is flipped, one gameteis formed (through the process of meiosis). If the flipped coin is on heads, then thegamete has the dominant allele (A). When both coins are flipped simultaneously, therewill be two possible gametes that can combine through fertilization to form a zygote. Eachtime you flip both coins, you will record the “genotype” of the offspring.3. Flip the coins 100 times and record your results in the chart belowarrow_forwardMendel's laws of segregation and independent assortment are based on the movement of chromosomes during meiosis, even though Mendel did not know about chromosomes during his lifetime. Can you match each of the following events with the law it illustrates? Sort each event to the appropriate bin. If an event doesn't illustrate either law, drag it to the neither bin. Reset Harrow_forward
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