If a male bird that is heterozygous for a recessive Z-linked mutation is crossed to a wild type female, what proportion of the progeny will be mutant males? A. 50% B. 0% C. 75% D. 100%
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- Match the pattern of inheritance to the appropriate term. A. Heterozygotes with different alleles of the DTL1 gene survive better than homozygotes B. The disease is usually passed from a mother to all children C. Pure-breeding pumpkin plants grown on sandy soil have bigger seeds than plants of the same pure-breeding lineage grown on peaty soil. D. A cross between a true-breeding plant with serrated leaf edges and a true- breeding plant with smooth leaf edges produces an F1 generation with 88% plants with serrated leaves. E. A cross between two heterozygotes, DdFf, produces offspring in three phenotypic groups; Long wings in offspring with genotype D_F_, short wings in offspring with D_ff, and no wings in offspring with the genotypes ddF_ and ddff. F. Individuals homozygous for a mutation in SME have a heightened sense of smell and large earlobes. G. Grey chickens bred together have offspring that are black, grey and white in a 1:2:1 ratio H.Alleles at locus S…The pea plants used in Mendel’s genetic inheritance studies were diploid, with 14 chromosomes in somatic cells. Assuming no crossing over events occur, how many unique gametes could one pea plant produce? a. 28 b. 128 c. 196 d. 16,384If 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.1/8
- Fruit flies are very useful model organisms that have been used to study genetics. One mutant recessive trait in fruit flies is called "eyeless" because it causes flies to have no eyes. Cross an eyeless fly with a homozygous normal fly. a. Draw the Punnett square. b. What is the genotyoe ratio of the offspring? c. What is the phenotype ratio of the offspring? d. What genetic problem is this? (monohybrid, dihybrid or multiple allele)The snapdragon flower in Tennessee and Alabama are both white. When these two strains of snapdragon were crossed, the resulting F1 produces purple-color flower. When the F1 was self-crossed, the F2 progeny were 540 purple and 420 white. 16. What kind of inheritance pattern is this? A. recessive epistasis B. complete dominance C. dominant epistasis D. codominance E. complementationIn tomatoes, round fruit is dominant over elongated fruit, and smooth skin is dominant over fuzzy or peach skin. An RS/rs plant is test-crossed and 1000 progeny are obtained. If the genes have a frequency of recombination of 26%, how many will be elongated and peach skin? A. 370 B. 260 C. 130 D. 740
- Dark chocolate is dominant to milk chocolate in a special species of chocolate bunnies. It is assumed that inheritance of this character follows the rules of Mendelian genetics. A homozygous milk chocolate bunny is crossed with a homozygous dark chocolate bunny. Which chocolate traits will the offspring express and in what ratio? A. 3 milk chocolate to 1 dark chocolate B. All the bunnies will be milk chocolate C. 1 dark chocolate bunny to 1 milk chocolate bunny D. All the bunnies will be dark chocolate E. 3 dark chocolate to 1 milk chocolateA cross occurs between a black homozygous mouse and a white homozygous mouse. They produce gray offspring. Referring to the mouse scenario noted above, what is the percentage phenotypic probability if we cross two gray mice from F1 generation? a. 100% black b.75% gray; 25% white c. 25% black ; 50% gray , 25% white d. 50% black; 50% whiteIn Manx cats, the alleles "TT" yield a cat with a normal long tail, the alleles "Tt" yield a cat with a short or absent tail, and the alleles "tt" are lethal to the embryo. Predict the genotypes and phenotypes of potential kittens resulting from the mating of two short-tailed cats. a. genotype of male b. genotype of female c. genotypes of offspring d. phenotypes of officina
- A cross occurs between a black homozygous mouse and a white homozygous mouse. They produce gray offspring. Respond to the question based upon this scenario. What are the percentage probabilities for the genotype and phenotype of the offspring? a. 100% black; 100% Bb b. 100% gray; 100% bb c. 100% white; 75% Bb, 25% bb d. 100% gray; 100% BbDuring a dihybrid cross involving two linked genes (two-point testcross), 20 flies showed recombinant phenotypes, whereas 480 flies showed the parental phenotypes. How far apart are these linked genes from each other? a. 20 cM b. 7.5 cM c. 4 cM d. 0.04 cM e. 8 cMImagine you are performing a cross involving seed color in garden pea plants. What F1 offspring would you expect if you cross true-breeding parents with green seeds and yellow seeds? Yellow seed color is dominant over green. a. 100 percent yellow-green seeds b. 100 percent yellow seeds c. 50 percent yellow, 50 percent green seeds d. 25 percent green, 75 percent yellow seeds