Concept explainers
An organism having the genotype AaBbCcDdEe is self-fertilized. Assuming the five genes assort independently, determine the following proportions:
a. gametes that are expected to carry only dominant alleles
b. progeny that are expected to have a genotype identical to that of the parent
c. progeny that are expected to have a
d. gametes that are expected to be ABcde e. progeny that are expected to have the genotype AabbCcDdE–
Learn your wayIncludes step-by-step video
Chapter 2 Solutions
Genetic Analysis: An Integrated Approach (3rd Edition)
Additional Science Textbook Solutions
Human Physiology: An Integrated Approach (8th Edition)
Biology: Life on Earth (11th Edition)
Human Anatomy & Physiology
Campbell Biology: Concepts & Connections (9th Edition)
Campbell Biology: Concepts & Connections (8th Edition)
- Given a cross between AabbCcDdEeFFGgHh x AaBbCcDdEEffggHH, a) how many possible gametes can the first individual produce? b) what proportion of the offspring will phenotypically resemble the first parent? c) what proportion of the offspring will genotypically resemble the second parent? d) how many phenotypes can be expected from the cross?arrow_forwardA woman with a rare autosomal recessive disorder was told that it was unlikely that her children would have the disorderas her husband did not have it. However, her first child has the disorder. a. What is the most likely explanation? b. Diagram the cross between the woman and her husband using a Punnett square, give the genotypic ratio (GR) and phenotypic ratio (PR) from the Punnett square. c. Based on the Punnett square results, what is the chance that her next child will have the disorder?arrow_forwardThe condition phenylketonuria is caused by a recessive allele. There are two carriers who have progeny.a. Give the gene notation. b. Give the expected genotypic and phenotypic ratios. c. What is the probability that their child will be heterozygous if they have a normal child?d. What is the probability of having two affected children and one normal child if they have three children?arrow_forward
- If two gene pairs A and a and B and b are assorting independently with A dominant to a and B dominant to b, what is the probability of obtaining: a. an AB gamete from an AaBb individual? b. an AABB zygote from an AaBb x AaBb cross? c. an aaBb offspring from an AaBB x aabb cross? d. a phenotype aB from an Aabb x aaBb cross? e. an ab gamete from an aaBB individual?arrow_forwardThe allele for red feather color in pigeons (B), is dominant to the allele for brown feathers (b.) A red pigeon that has a red parent and a brown parent is mated with a brown pigeon. a.) Give the genotypes of the two pigeons being mated. b.) what proportion of the F1 progeny would be expected to have brown feathers? Assume that these pigeons produce five young pigeons. c.) what is the probability that all five will be red? d.) What is the probability that 3 will be red and 2 will be brown?arrow_forwardFruit flies can have straight wings (S) or curly wings (s), and they can have be female XX or male XY. (A) For a standard monohybrid cross (Ss ´ Ss), what proportion of the offspring will have the genotype ss? (Express the proportion as a simple fraction) (B) For the following cross (SsXX ´ SsXY), what proportion of the offspring will have the genotype Ss? (Express the proportion as a simple fraction) (C) What proportion will have the genotype XX? (Express the proportion as a simple fraction) (D) What proportion will have the genotype SsXX? (Express the proportion as a simple fraction)SHOW YOUR WORKarrow_forward
- a. If 3 completely dominant gene pairs A a, B b, C c are assorting independently,how many progeny genotypes are expected in a heterozygote? b. If 3 completely dominant gene pairs A a, B b, C c are assorting independently,what is the probability of obtaining an AbC gamete from an AaBbCcindividual?Express answer in fraction form.arrow_forwardIn guinea pigs, black hair colour (B) is dominant and brown hair colour (b) is recessive. Long hair (L) is dominant and short hair (l) is recessive. Answer the following questions: (a) Find the gamete types for the cross: BbLl X BbLL (b) What are the phenotypes of the parent generation? (c) What are the genotypes and phenotypes of the F1 generation?arrow_forwardImagine a test cross for an unknown exhibiting 2 traits, where half of the offspring exhibit both dominant traits and the other half exhibits one dominant and one recessive trait. What can you conclude about the unknown? options: A) The unknown is homozygous dominant for both traits. B) The unknown is homozygous recessive for both traits. C) The unknown is heterozygous for both traits. D) The unknown is homozygous for one gene and heterozygous for the other. E) There is not enough information to determine the answer.arrow_forward
- Assume 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_forwardIn garden peas, long stems are dominant to short stems, and yellow seeds are dominant to green seeds. 100 long/yellow pea plants, all of which had one short/green parent, are interbred (bred to each other). 1600 progeny result. Please answer the following questions about these progenies. A. Assuming that these two genes are unlinked, about how many long/green pea plants would you expect to find among the offspring? B. What ratio of yellow to green seed color would you expect among the offspring? C. What would you expect the overall phenotypic ratio among the 1600 offspring to be (taking into consideration both traits)?arrow_forwardIf a cross produced a progeny population of 900 plants that consists of 258 with white flowers and 642 with purple flowers, which of the following is most likely? P = purple, p = white. A. They deviated from a 3:1 ratio because of epistasis. B. They are the progeny of a cross in which one parent was PP and the other was Pp. C. P is clearly semi-dominant. D. The purple phenotype is co-dominant with white E. They resulted from a cross in which the parents were of identical genotype at the P locus.arrow_forward
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College