Consider the following statement: ‘female, w+w flies have red eyes’. In this example: Group of answer choices 1) w+w is the genotype, and red eyes is the phenotype 2) female is the genotype, and red eyes is the phenotype 3) not enough information provided to determine genotype or phenotype 4) red eyes is the genotype, and w+w is the phenotype
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- You cross a true-breeding yellow-bodied, smooth-winged female fly with a true-breeding red-bodied, crinkle-winged male. The red body phenotype is dominant to the yellow body phenotype and smooth wings are dominant to crinkled wings. Use B or b for body color alleles, and W or w for wing surface alleles.(4 points) a) What are the genotypes of the P generation flies? b) What will be the genotype(s) and phenotype(s) of the F1 offspring? c) You discover that the genes for body color and wing surface are linked. You perform a dihybrid test cross between the F1 flies from part (b) with a true-breeding yellow-bodied, crinkle-winged fly. Use the following results of this cross to determine the recombination frequency (%) between the body color and wing surface genes. (Remember that the recombinants are the ones that do not resemble the parental types from the P generation.) Body Color Wing Surface # of Individuals red smooth 102 yellow smooth 404 red crinkled 396 yellow crinkled…A female from true breeding line of Drosophila with white eyes is crossed with a male from a true breeding line with brown eyes. All of the offspring have wild type brick red eyes. Which of the following explanations is most likely? A) There are many alleles for the single gene for eye color. Wild type brick red eyes result only when the fly is heterozygous. B) The alleles for brown, white, and brick red eyes are alleles for a single locus. The allele for brown eye color is dominant to the allele for brick red eye color and to the allele for white eyes. C) There is more than one gene for eye color. The brown mutation and the white mutation occur in separate genes and are both recessive to the wild type alleles. The offspring are heterozygous for both genes, so they are phenotypically wild type. D) None of the above. It is not possible for a cross between a white-eyed and a brown-eyed fly to produce wild type offspring.In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette (black and white spotted). 10pts a) What is the genotype for black chickens? b) What is the genotype for white chickens? c) What is the genotype for erminette chickens? d) Two erminette chickens were crossed. Show the Punnett square. e) What’s the probability they would have a black chick? ____% f) What’s the probability they would have a white chick? ____% g) What’s the probability they would have erminette chick? ___ %
- A white flower is crossed with a purple flower, and the offspring exhibit incomplete dominance. A) What is the phenotypic ratio of the F1 generation offspring? What is the genotypic ratio of the F1 generation offspring? B) What is the phenotypic ratio of the F2 generation offspring? What is the genotypic ratio of the F2 generation offspring? Answer and work:18) Hydrangea plants of the same genotype are planted in a large flower garden. Some of the plants produce blue flowers and others pink flowers. This can be best explained by which of the following? A) multiple alleles must involved B) the allele for blue hydrangea is completely dominant over the allele for pink hydrangea C) the genes for flower color experience epistatic interactions D) environmental factors such as soil pH affect the phenotype inont olloleA rosy-eyed Drosophila was crossed with a forked bristle Drosophila. The F1 were all wild-type while the F2 consisted of 306 wild-type, 94 rosy-eyed, 102 fork-bristled, and 33 forked bristled and rosy-eyed flies. Infer the genotype of the F1. a) RRff x rrFF b) RrFf x RrFf c) RRFF x rrff d) rrff x rrff e) none of these are correct
- 2) In chickens, feather colour is determined by alleles at 2 loci. Chickens with the allele I have white feathers, whatever alleles they have at the other locus. Chickens with the genotype cc also have white feathers, although presence of the dominant allele C results in coloured feathers, so long as the I allele is absent. Write down all the possible genotypes that produce a) white chickens b) coloured chickens c) which is the epistatic gene? d) what type of epistasis is this?Consider a Droscophilia fly with a genotype of Nn XqYY. The dominant allele of the sex-linked gene specifies a black body and the recessive a white body. The recessive autosomal allele specifies hairy bristles while the dominant allele specifies smooth bristles. i)What is the ploidy of this fly? ii) What would the sex of this fly be? iii)What would the phenotype of this fly be with respect to these two loci?a) Assume that colour is controlled by a single sex-influenced gene where green is expressed preferentially in males. Individuals I-1 and I-2 are homozygous for red and green respectively. Which individual/s in generation II will be red? b) If colour is a controlled by cytoplasmic DNA, which individual/s in generation II will be green?
- A) For the 3-point test cross, draw a sample gene map. B) Give the map distances (include units). C) Calculate Interference (I) and COC. Show all work Fly trait body texture, antenna shape, eye color gaunt, normal, white gaunt, feathery, white gaunt, feathery, red shrunken, feathery, white shrunken, normal, white shrunken, feathery, red gaunt, normal, red shrunken, normal, red Total number of progeny: Gamete from trihybrid GNr Gnr GnR gnr gNr gnR GNR gNR Number 628 2708 113 3 124 661 2 2761 7000Two pea plants that are true-breeding for recessive white flowers are mated and their offspring analyzed. Which of the following statements about this situation is true? Group of answer choices A)The offspring represent the P generation. B)The gametes produced by the offspring will carry only one allele for this gene. C)Both parents are referred to as heterozygotes. D)Half of the offspring will be true-breeding for white flowers.1) In some species of pea plant, pea colour is determined by one pair of alleles and pea shape by another - the genes are on different chromosomes. A plant grown from a round green pea was self-pollinated. The following numbers of offspring were obtained: 95 green round, 28 white round, 30 green wrinkled, 11 white wrinkled. a) What is the ratio of the phenotypes in the offspring? b) In each pair of alleles, colour and shape, which allele is dominant and which recessive? c) what was the genotype of the parent(s)? Use a diagram to show how this explains the phenotype ratio of the offspring.