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To explain: The fraction of the mice in the
Introduction: The gene for the brown color (B) in mice is dominant over the white color (b) which is recessive. The cross of the purebred (homozygous) brown color species of mice with the purebred (homozygous) white color species of mice leads to the generation of all heterozygous mice with brown color in the
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Campbell Essential Biology with Physiology (6th Edition)
- The genetic identity of the female parent is RrGg and the genetic identity of the male parent is Rrgg. They produce 320 offspring together from a single mating: 57 red-eyed females with grey bodies, 61 red-eyed females with yellow bodies, 22 brown-eyed females with grey bodies, 20 brown-eyed females with yellow bodies.59 red-eyed males with grey bodies, 63 red-eyed males with yellow bodies, 20 brown-eyedmales with grey bodies, 18 brown-eyed males with yellow bodies. Show the simultaneous transmission of the two genes involved to give rise to the progeny given with the use of genetic diagrams and summaries as required. (Hint: you are only requiredto show the simultaneous transmission from the P to F1 generations)arrow_forwardA fruit fly with a gray body and red eyes (genotype BbPp) is mated with a fly having a black and purple eyes (genotype bbpp). Show diagrammatically a genetic cross between the two flies and the possible genotypes and phenotypes of F1. What ratio of offspring would you expect if the body-colour and eye-colour genes are on different chromosome (unlinked)? When mating is actually carried out, most of the offspring look like the parents, but 3% have a gray body and purple eyes, and 3% have a black body and red eyes. Compare and discuss the observation with your answer in part (arrow_forwardIn fruit flies, red eye color (R) is dominant over brown eye color (r). Two red-eyed fruit flies were mated and they produced the following offspring: 73 red-eyed flies; 27 brown-eyed flies. In the offspring, what is the approximate ratio of red-eyed to brown-eyed fruit flies?arrow_forward
- A red-eyed (dominant) female with a grey (dominant) body is crossed with red-eyed (dominant) male with a yellow body (recessive) The pair of fruit flies (given above) produce 320 offspring together from a single mating: 57 red-eyed females with grey bodies, 61 red-eyed females with yellow bodies, 22 brown- eyed females with grey bodies, 20 brown-eyed females with yellow bodies. 59 red-eyed males with grey bodies, 63 red-eyed males with yellow bodies, 20 brown-eyed males with grey bodies, 18 brown-eyed males with yellow bodies. From this information only (NO genetic diagrams required), what evidence and logic can you use to deduce the genetic identity of the parent flies?arrow_forwardIn fruit flies, the allele for normal wings (V) is dominant to the allele for short wings (v). Suppose two fruit flies heterozygous for the trait are mated. What is the male fruit fly’s genotype and the female fruit fly’s genotype? What is the male fruit fly’s phenotype and the female fruit fly’s phenotype? What will be the genotypic ratio of the F1 generation? What will be the phenotypic ration of the F1 generation?arrow_forwardIn the species Chinchilla chinchilla, Neotropical crepuscular rodent of the parvorder Caviomorpha, a mating between a homozygous long-tailed chinchilla male and a homozygous short chinchilla female will produce all medium length tail chinchilla offspring. When these medium length tail chinchilla offspring F₁ are mated, their offspring consists of 3 tail-less chinchillas, 24 long-tailed chinchillas, 120 medium-length tailed chinchillas, and 15 short-tailed chinchillas. What genetic interaction may be occurring in this population? Please explainarrow_forward
- A guinea pig that is heterozygous for fur color and texture mates with another guinea pig heterozygous for both traits. They produce 96 offspring. How do I draw a Punnett Square for this information?arrow_forwardAssume that a single gene determines coat coloration in cats, with the B allele resulting in orange coloration, and b allele results in black coloration. This gene exists on the X chromosome (recall that cats have XX/XY system of sex determination). My cat Pepper is a female tortoiseshell, and my cat Hobbes is an orange male. (i) What is the probability that Hobbes and Pepper have three kittens, Hopper (male), Pepsi (female), and Hippie (female)? What is the probability that they have three kittens, and that Hopper (male), and Hippie (female) are both orange, and that Pepsi (female) is a tortoiseshell? (ii) Distribution of % of Barr Bodies in each body part 120 100 100 80 100 60 40 50 50 20 Head Body Tail Black Orangearrow_forwardIn a cross between a black and a white guinea pig, all members of the F1 generation are black. The F2 generation is made up of approximately 3/4 black and 1/4 white guinea pigs. (a) Diagram this cross, showing the genotypes and phenotypes. (b) What will the offspring be like if two F2 white guinea pigs are mated? (c) Two different matings were made between black members of the F2 generation, with the following results. Cross Offspring Cross 1 All black Cross 2 3/4 black, 1/4 white Diagram each of the crosses.arrow_forward
- In an insect species, the genes for white eyes (w) and smooth legs (s) are linked and are located 16 map units apart. A white-eyed, smooth-legged female was mated to a true-breeding wild-type male; the resulting F1 phenotypically wild-type females were mated to white-eyed, smooth-legged males. In an F2 of 100 individuals, what would be the expected number of F2 individuals for each phenotype? wild-type: white-eyed: smooth-legged: white-eyed and smooth-legged:arrow_forward(This one is more complicated). Two true breeding fruit flies are allowed to mate. One fly ishomozygous dominant for body color and eye color while the other is homozygous recessive forbody color and eye color. (g+:gray body, g:black body, e+:ebony eyes, e:red), The F1 flies areallowed to mate. What are the following probabilities in the F2 generation? For this problemmake sure to show the Punnett Square for your F2 generation and all of your calculations. Youdo not need to show the Punnett Square for the F1 generation. Answer in percent and round to 2decimals.a. Two of three fruit flies are gray and red.b. The first fruit fly is gray and ebony, the second fruit fly is gray and red, and the third fruit fly is black and ebony.arrow_forwardin certain fish the mating of black-scaled (B) with white a white-scaled (W) will create offspring with a patchwork with black and white scales. which type of inheritence pattern is this?arrow_forward
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