With complete dominance, one allele conceals the phenotype effect of another gene, while with incomplete dominance, neither of the two alleles can conceal the effect of each other. Which of the following rows represents the difference in interactions in their phenotypes ratio, in F2 generation? Row Complete dominance 1:1 В. Incomplete dominance 1:2:1 A. 1:2:1 3: 1 C. С. 3: 1 1:2:1 D. 3:1 1:1

With complete dominance, one allele conceals the phenotype effect of another gene, while with incomplete dominance, neither of the two alleles can conceal the effect of each other. Which of the following rows represents the difference in interactions in their phenotypes ratio, in F2 generation? Row Complete dominance 1:1 В. Incomplete dominance 1:2:1 A. 1:2:1 3: 1 C. С. 3: 1 1:2:1 D. 3:1 1:1

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Description: With complete dominance, one allele conceals thephenotype effect of another gene, while withincomplete dominance, neither of the two allelescan conceal the effect of each other. Which of thefollowing rows represents the difference ininteractions in

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter4: Pedigree Analysis In Human Genetics

Section: Chapter Questions

Problem 14QP: Analysis of Autosomal Recessive and Dominant Traits Huntington disease is a rare, fatal disease that...

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Two alleles at one locus produce three distinctphenotypes. Two alleles of two genes lead tofive distinct phenotypes. Two alleles of six geneslead to 13 distinct phenotypes. (These statementsassume that the alleles at any one locus arecodominant or incompletely dominant andthat each gene makes an equal contributionto the phenotype.)a. Derive a formula to express this relationship. (Letn equal the number of genes.)b. Each of the most extreme phenotypes for a traitdetermined by two alleles at one locus are foundin a proportion of 1/4 in the F2 generation. If twoalleles of two genes determine the trait, each extreme phenotype will be present in the F2 as 1/16of the population.In common wheat (Triticum aestivum),kernel color varies from red to white andthe genes controlling the color act additively,that is, alleles for each gene are incompletelydominant and each gene contributes equallyto the color. A true-breeding red variety iscrossed to a true-breeding white variety, and1/256 of the F2…
Huntington disease is a rare fatal, degenerative neurological disease in which individuals start to showsymptoms in their 40s. It is caused by a dominant allele. Joe, a man in his 20s, just learned that his fatherhas Huntington disease.a. What is the probability that Joe will also developthe disease?b. Joe and his new wife have been eager to start afamily. What is the probability that their first childwill eventually develop the disease?
For each of the terms in the left column, choose thebest matching phrase in the right column.a. phenotype 1. having two identical alleles of a given geneb. alleles 2. the allele expressed in the phenotype ofthe heterozygotec. independent 3. alternate forms of a gene assortmentd. gametes 4. observable characteristice. gene 5. a cross between individuals bothheterozygous for two genesf. segregation 6. alleles of one gene separate into gametesrandomly with respect to alleles of othergenesg. heterozygote 7. reproductive cells containing only onecopy of each geneh. dominant 8. the allele that does not contribute to thephenotype of the heterozygotei. F1 9. the cross of an individual of ambiguousgenotype with a homozygous recessiveindividualj. testcross 10. an individual with two different allelesof a genek. genotype 11. the heritable entity that determines acharacteristicl. recessive 12. the alleles an individual hasm. dihybrid cross 13. the separation of the two alleles of agene into…
With regard to heterosis, is each of the following statements consistent with the dominance hypothesis, the overdominance hypothesis, or both? A. Strains that have been highly inbred have become monomorphicfor one or more recessive alleles that are somewhat detrimentalto the organism. B. Hybrid vigor occurs because highly inbred strains are monomorphicfor many genes, whereas hybrids are more likely to beheterozygous for those same genes.C. If a gene exists in two alleles, hybrids are more vigorousbecause heterozygosity for the gene is more beneficial thanhomozygosity of either allele.
Midphalangeal hair (hair on top of the middlesegment of the fingers) is a common phenotypecaused by a dominant allele M. Homozygotes forthe recessive allele (mm) lack hair on the middlesegment of their fingers. Among 1000 families inwhich both parents had midphalangeal hair, 1853children showed the trait while 209 children did not.Explain this result
The dominant allele H reduces the number of bodybristles in fruit flies, giving rise to a hairless phenotype. In the homozygous condition, H is lethal. Thedominant allele S has no effect on bristle number except in the presence of H, in which case a single S allele suppresses the hairless phenotype, thus restoringthe bristles. However, S is also lethal in homozygotes.a. What ratio of flies with normal bristles to hairlessindividuals would we find in the live progeny of across between two normal flies both carrying theH allele in the suppressed condition?b. When the hairless progeny of the previous cross arecrossed with one of the parental normal flies frompart (a) (meaning a fly that carries H in the suppressed condition), what phenotypic ratio wouldyou expect to find among their live progeny?
In most two-factor crosses involving linked genes, we cannot tellif a double crossover between the two genes has occurred becausethe offspring will inherit the nonrecombinant pattern of alleles.How does the inability to detect double crossovers affect thecalculation of map distance? Is map distance underestimated oroverestimated because of our inability to detect double crossovers?Explain your answer.
Why can it be said that arecessive allele can remainhidden in the phenotype of anindividual and revealed onlywhen manifested inhomozygosity in theoffspring?
A woman who is heterozygous, Bb, has brown eyes; B (brown) isthe dominant allele, and b (blue) is recessive. One of her eyes,however, has a patch of blue color. Give three different explanationsfor how this might have occurred?
Write the number of different kinds of phenotypes,excluding sex, you would see among a large numberof progeny from an F1 mating between individuals ofidentical genotype that are heterozygous for one ortwo genes (that is, Aa or Aa Bb) as indicated. No geneinteractions means that the phenotype determined byone gene is not influenced by the genotype of theother gene.a. One gene; A completely dominant to a.b. One gene; A and a codominant.c. One gene; A incompletely dominant to a.d. Two unlinked genes; no gene interactions; Acompletely dominant to a, and B completelydominant to b.e. Two genes, 10 m.u. apart; no gene interactions; Acompletely dominant to a, and B completely dominant to b.f. Two unlinked genes; no gene interactions; A anda codominant, and B incompletely dominant to b.g. Two genes, 10 m.u. apart; A completely dominantto a, and B completely dominant to b; and withrecessive epistasis between aa and the alleles ofgene B.h. Two unlinked duplicated genes (that is, A and Bperform…
In sheep, the formation of horns is a sex-influenced trait; the allelethat results in horns is dominant in males and recessive in females.Females must be homozygous for the horned allele to have horns.A horned ram was crossed to a polled (unhorned) ewe, and the firstoffspring they produced was a horned ewe. What are the genotypesof the parents?
In the multiple-allele series that determines coat color inrabbits, c+ encodes agouti, cch encodes chinchilla (a beigecoat color), and ch encodes Himalayan. Dominance is inthe order c+ > cch > ch. In a cross of c+/cch × cch/ch, whatproportion of progeny will be chinchilla?