Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
1. A purple-flowered pea plant is crossed with a white-flowered pea plant. All the F1 plants produce purple flowers. When the F1 plants are crossed with each other, 401 of the F2 plants have purple flowers and 131 have white flowers. What are the genotypes of the parental and F1 generation plants? 2. In tomatoes, red fruit colour is dominant to yellow. Suppose a tomato plant homozygous for red is crossed with one homozygous for yellow. Determine the appearance of (a) the F1 (b) the F2 (c) the offspring of a cross of the F1 back to the original red parent (d) the offspring of a cross of the F1 back to the yellow parent 3. A red-fruited tomato plant, when crossed with a yellow-fruited one, produces progeny about half of which are red-fruited and half are yellow-fruited. What are the genotypes of the parents? 4. In guinea pigs, rough coat (R) is dominant over smooth coat (r). A rough-coated guinea pig is bred to a smooth one, giving 8 rough and 7 smooth progeny in the F1. a) What are the genotypes of the parents and their offspring? b) If one of the F1 animals is mated to its rough parent, what progeny would you expect? 5. Purple flowers are dominant to white flowers in the Jimsonweed. When a particular purple-flowered Jimsonweed is self-pollinated, there are 28 purple-flowered and 10 white flowered progeny. What proportion of the purple-flowered progeny is truebreeding? 1. In rabbits, C=agouti coat colour, cch=chinchilla, ch=Himalayan, and c=albino. The four alleles constitute a multiple allelic series. The agouti is dominant to the other three alleles and albino c is recessive to the other three alleles. Chinchilla is dominant to Himalayan. Determine the phenotypes of progeny from the following crosses. a) b) c) d) e) f) CC X cc Ccch X Cc Cc X Cc Cch X chc Cch X cc cchch X chc 1. In humans the three alleles IA, IB, and I constitutes a multiple allelic series that determine the ABO blood group system. For the following problems state whether the child mentioned can actually be produced from the marriage. EXPLAIN YOUR ANSWER. a) b) c) d) e) an O child from the marriage of two A individuals an A child from the marriage of an A to a B an AB child from the marriage of an A to an O an O child from the marriage of an AB to an A an A child from the marriage of an AB to a B 1. In Jimsonweed purple flower (P) is dominant to white (p), and spiny pods (S) are dominant to smooth (s). In a cross between a Jimsonweed homozygous for white flowers and spiny pods and one homozygous for Purple flowers and Smooth pods, determine the following: a) b) c) d) the phenotype of the F1 the phenotype of the F2 the progeny of a cross of the F1 back to the white, spiny parent the progeny of a cross of the F1 back to the purple, smooth parent 2. What phenotypes would you expect to find in progeny from the following Jimsonweed crosses? a) b) c) d) e) f) PPss X ppSS PpSS X ppss PpSs X PpSS PpSs X PpSs PpSs X Ppss PpSs X ppss 3. In summer squash white fruit (W) is dominant over yellow (w), and disk-shaped fruit (D) is dominant over sphere-shaped fruit (d). In the following problems, the phenotypes of the parents and their offspring are given. Determine the genotypes of the parents in each case. Parents Offspring a) White, disk X Yellow, sphere ½ White disk and ½ white sphere b) White, sphere X White sphere ¾ White sphere and ¼ yellow sphere c) Yellow disk X White sphere all white disk d) White disk X Yellow sphere ¼ White disk, ¼ White sphere, ¼ Yellow disk, ¼ Yellow sphere