Concepts of Biology
1st Edition
ISBN: 9781938168116
Author: Samantha Fowler, Rebecca Roush, James Wise
Publisher: OpenStax College
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Textbook Question
Chapter 8, Problem 4RQ
Imagine that you are performing a cross involving seed color in garden pea plants. What traits would you expect to observe in the
a. only yellow-green seeds
b. only yellow seeds
c. 1:1 yellow seeds:green seeds
d. 1:3 green seeds:yellow seeds
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You cross two pea plants both from pure breeding lines. One has hairy leaves and the other has smooth leaves. All the offspring have hairy leaves. If you take one of the offspring (F1) and cross it back to smooth-leaved plant what phenotypic ratio do you expect in the next generation?
Group of answer choices
A. half smooth and half hairy
B. all smooth
C. all hairy
D. 3/4 hairy and 1/4 smooth
Imagine that you are performing a cross involving seed texture in garden pea plants. You cross true-breeding round and wrinkled parents to obtain F1 offspring. Which of the following experimental results in terms of numbers of plants are closest to what you expect in the F2 progeny?a. 810 round seedsb. 810 wrinkled seedsc. 405:395 round seeds:wrinkled seedsd. 610:190 round seeds:wrinkled seeds
A tall pea plant with terminal flowers (flowers on the ends of the stems) is crossed with a short plant thathas axial flowers. All 72 offspring are tall with axial flowers. This is a dihybrid cross with the height andflower position traits showing independent assortment.
a. Name the dominant and recessive alleles.
b. Give the genotypes of the parents and offspring in this cross.
c. Predict the F2 offspring when the tall-axial F1's are allowed to self pollinate.
Chapter 8 Solutions
Concepts of Biology
Ch. 8 - Figure 8.9 In pea plants, round peas (R) are...Ch. 8 - Figure 8.10 In pea plants, purple flowers (P) are...Ch. 8 - Figure 8.16 What ratio of offspring would result...Ch. 8 - Imagine that you are performing a cross involving...Ch. 8 - Imagine that you are performing a cross involving...Ch. 8 - The observable traits expressed by an organism are...Ch. 8 - A recessive trait will be observed in individuals...Ch. 8 - What are the types of gametes that can be produced...Ch. 8 - What is the reason for doing a test cross? a. to...Ch. 8 - If black and white true-breeding mice are mated...
Ch. 8 - The ABO blood groups in humans are expressed as...Ch. 8 - In a cross between a homozygous red-eyed female...Ch. 8 - When a population has a gene with four alleles...Ch. 8 - Describe one of the reasons that made the garden...Ch. 8 - Use a Punnett square to predict the offspring in a...Ch. 8 - Use a Punnett square to predict the offspring in a...Ch. 8 - Can a male be a carrier of red-green color...Ch. 8 - Could an individual with blood type O (genotype...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Imagine that you are performing a cross involving seed texture in garden pea plants. You cross true-breeding round and wrinkled parents to obtain F1 offspring. Which of the following experimental results in terms of numbers of plants are closest to what you expect in the F2 progeny? a. 8lOroundseeds b. 8lOwrinkledseeds c. 405:395 round seeds:wrinkled seeds d. 610:190 round seeds:wrinkled seedsarrow_forwardIf several pea plants with the genotype TtYy are crossed with pea plants with the genotype TtYy, what is the probability of producing the genotype TTYY in offspring? A. 1/16 B. 1/2 C.1/4 D.1/8arrow_forwardIn a test cross, peas of an unknown genotype are crossed with peas of a known genotype. In this example, smooth peas are the unknown and wrinkled peas are the known (rr). If half of the offspring from that cross are smooth and half are wrinkled, what is the genotype of the unknown plant? O a. Homozygous dominant: RR O b. Homozygous recessive: rr Oc. Incomplete dominance d. Heterozygous dominant: Rr CLEAR MY CHOICEarrow_forward
- Yellow Dominant pea Seed with unknown genotype (YY or Yy) is test-crossed with green homozygous recessive pea seed (yy). After the test cross, the genotype of yellow dominant seed is Yy. What was the result of Cross that confirmed the genotype as Yy? a. All green seeds b. 50% yellow and 50% green seeds (½ : ½). c. All yellow seeds d. 75% yellow and 25% green seeds (3:1)arrow_forwardA plant that is homozygous for the recessive yellow pod color is crossed with a plant that is heterozygous. Which phenotype will appear MOST in the offspring? A. There will only be plants with green pods. B. There will be more plants with green pods. C. There will be more plants with yellow pods. D. Plants with yellow and green pods will appear in equal numbers.arrow_forwardshows the results of a cross between a tall pea plant and a short pea plant. a. What phenotypes and proportions will be produced if a tall F1 plant is backcrossed to the short parent? b. What phenotypes and proportions will be produced if a tall F1 plant is backcrossed to the tall parent?arrow_forward
- In pea plants, spherical seeds (S) are dominant to dented seeds (s). In a genetic cross of twoplants that are heterozygous for the seed shape trait,i. Explain the diagram ii. What fraction of the offspring should have spherical seeds? iii. Use punnett square to show your answer. iv. Interpret the results of a Punnett squarearrow_forwardA gardener pertorms a mononybra cross on two heterozygous orange-fruitea tomato plants. Plants expressing the recessive phenotype yield yellow tomato fruits. What percentage of the offspring will produce yellow tomatoes? A:75% B:50% C:100% D:25%arrow_forwardIf a true-breeding pea plant with yellow seeds is crossed with a true-breeding pea plant with green seeds, what is the probability that the F1 generation will have green seeds? A. 0% B. 25% C. 75% D. 100% The hereditary units that Mendel called \factors" are known today as A. genes B. traits C. chromosomes D. characteristics In snapdragons, a cross between a red-owering snapdragon and a white-owering snapdragon will produce snapdragons that have pink owers. This is an example of A. complete dominance B. incomplete dominance C. X-linked dominance D. codominance. Which is the genotype of an individual that could be used in a dihybrid cross? A. RRYY B. RRYy C. RrYY D. RrYy Which disorder is a dominant trait? A. hemophilia B. cystic brosis C. Tay-Sachs disease D. Huntington's disease Genetic continuity In a family with three children, what is the probability that the rst child is a boy, the second child is a girl, and the third child is a boy? A. 12:5% B. 25% C. 50% D. 75%arrow_forward
- In peas, tall stems & axial flowers are dominant to dwarf stems & terminal flowers, which are recessive. If you have a tall, axial flowering plant and want to determine its genotype, what kind of pea should you breed it with? a. tall & axial flowering b. dwarf & axial flowering c. dwarf & terminal flowering d. tall & terminal floweringarrow_forwardAn incompletely dominant gene controls flower petal color in carnations, where R is red and W is white. If two pink carnations are crossed and produce 40 offspring, how many of these offspring would you expect to be red? A. 40 B. 0 C. 20 D. 30 E. 10arrow_forwardT = Tall t = short pollen from a tall pea plant T T eggs from a tall pea plant T TT TT t Tt Tt In the square shown, which of the following is true about the offspring resulting from the cross? Multiple Choice a. Half are expected to be short. b. All are expected to be tall. c. All are expected to be short. d. All are expected to be of medium height.arrow_forward
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