Concept explainers
A cross is made between
and
individuals. Rather than making a very large Punnett square, which statistical operation could you use to solve this problem, and what would be the probability of an offspring that is
a. Product rule, 1/32
b. Product rule, 1/4
c. Binomial expansion, 1/32
d. Binomial expansion, 1/4
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Genetics: Analysis and Principles
- Why are relatives used in the calculation of heritability?arrow_forwardWhich of the following statements is not true about heritability? a. H^2 is always a number between 0 and 1 b. H^2 =1 indicates most variation in a trait among individuals due to variation in genes c. H^2 means what fraction of variation in a trait is due to variation in genes and what fraction is due to variation in environmental conditions d. H^2 =1 indicates most variation in a trait among individuals due to variation in environmentsarrow_forwardAssume a biallelic locus in a diploid population. Out of 100 individuals, the following genotypes were observed: 59 A1A1 individuals; 16 A1A2 individuals; and 25 A2A2 individuals. What is the observed (actual; not predicted) allele frequency of the A1 allele? (you may use a calculator here) O A. 0.33 O B. 0.67 O C. 0.16 O D.0.59 O E. 0.25arrow_forward
- You are following segregation of four genes in a cross – A, B, C, and D Dominant alleles are capital letters and recessive alleles are small case. You take the cross - aa Bb cc Dd x Aa Bb CC Dd. What is the frequency expected among the progeny for the heterozygous genotype: Aa Bb Cc Dd? Group of answer choices a. 1/4 b. 1/32 c. 0 d. 1/16 e. 1/8arrow_forwardWhat is the coefficient of inbreeding for the offspring of half siblings? Draw the pedigree to show your work. Paragraph BI U A/ V E✓ E ✓ AO GO +arrow_forwardRed-flowering snapdragons are homozygous for allele R1. White-flowering snapdragons are homozygous for a different allele (R2). Heterozygous plants (R1R2) bear pink flowers. What phenotypes should appear among first-generation offspring of the crosses listed? What are the expected proportions for each phenotype? a. R1R1 × R1R2 c. R1R2 × R1R2 b. R1R1 × R2R2 d. R1R2 × R2Rarrow_forward
- You are working with a new species of spider in the lab. Wild type spiders have black legs and long mandibles. Mutants have black/brown striped legs and short mandibles. You perform a cross between wild type and mutant spiders. Your results : 5,502 wild type; 5,877 mutant; 69 black/brown striped, long mandibles; 52 black, short mandibles. What information does the recombination frequency tell you about the traits? (You will need to solve the RF first if you haven't done so in the other problem.) * A. Crossing over occurs frequently between the two traits. B. They are unlinked genes. C. They are located on separate chromosomes D. They are located very close together on the same chromosome.arrow_forwardAn individual with two different alleles at a locus is a(n) Group of answer choices A. clone B. hemizygote C. homozygote D.heterozygotearrow_forwardYou have a box full of objects (several thousand). One half of the objects are cubes, one quarter of the objects are spheres, and one quarter of the objects are pyramids. You draw two objects out of the box. What is the probability that one of them is a sphere and the other is a pyramid (order not important)? Group of answer choices A. 1/2 B. 1/16 C. 1/8 D. 1/4arrow_forward
- Remember the following when working pedigree tables: 1) Circles are females and squares are males. 2) A shaded circle or square indicates that a person has the trait. The pedigree seen below is for colorblindness. Shaded individuals are colorblind. Determine the probable genotype of persons 1-15, and then answer the questions below the table. 2 6. 10 11 12 13 14 15 How did you determine the genotype of the mother at 37 Number 8 was colorblind just like his father. Where did the son at 8 get his allele for colorblindness? Neither numbers 1 nor 2 were colorblind. How did they have a colorblind son (6)7 What must be the genotypes of the parents of a colorblind daughter? Explain. If number 13 marries a normal man, what is the probability that their sons will be colorblind?arrow_forwardyou perform a cross of two heterozygous, red-eyed flies. They have 100 offspring. How many of these offspring do you predict will have red eyes? Show your work using a Punnett square. [Use letters R and r to designate the alleles]arrow_forwardWhich of the following applies to the Hardy-Weinberg expression:p2 + 2pq + q2?a. Knowing either p2 or q2, you can calculate all the otherfrequencies.b. It applies to Mendelian traits that are controlled by one pairof alleles.c. 2pq = heterozygous individualsd. It can be used to determine the genotype and allelefrequencies of the previous and the next generations.e. All of these are correct.arrow_forward
- Human Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage Learning