Concept explainers
a.
To determine: The possible genotype of both the parents for the given offspring.
Introduction: According to
b.
To determine: The possible genotype of both the parents for the given offspring.
c.
To determine: The possible genotype of both the parents for the given offspring.
d.
To determine: The possible genotype of both the parents for the given offspring.
e.
To determine: The possible genotype of both the parents for the given offspring.
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Study Guide for Campbell Biology
- In watermelons, the green colour gene (G) is dominant over the striped colour gene (g), and round shape (R) is dominant over long shape (r). A heterozygous round green colour (GgRr) watermelon plant is crossed with another heterozygous round green colour (GgRr) plant. Determine the expected phenotypic ratio of the F1 generation.arrow_forwardTwo genes control color in corn snakes as follows:O– B– snakes are brown, O– bb are orange, oo B– areblack, and oo bb are albino. An orange snake wasmated to a black snake, and a large number of F1progeny were obtained, all of which were brown.When the F1 snakes were mated to one another, theyproduced 100 brown offspring, 25 orange, 22 black,and 13 albino.a. What are the genotypes of the F1 snakes?b. What proportions of the different colors wouldhave been expected among the F2 snakes if the twoloci assort independently?arrow_forwardIn garden pea plants, axial flower location is dominant (A) to terminal flower location (a). If a plant that is heterozygous for axial flower location is crossed with a plant that has terminal flower location, what is the genotypic ratio of the offspring?arrow_forward
- A 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 garden peas, purple flowers (P) are dominant to white (p) flowers, and tall plants (T) are dominant to short plants (t). If a purple tall plant (PpTt) is crossed with a white short blant, what is the expected phenotypic ratio of the offspring? * O 1:1:1:1 purple tall to purple short to white tall to white short O 3:2 purple tall to purple short 9:3:3:1 purple tall to purple short to white tall to white short O 1:1 purple tall to purple short all purple tallarrow_forwardD D 1 2 d In a particular plant, leaf color is controlled by gene locus D. Plants with at least one allele D have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding, dark-leaved plant is crossed with a light-leaved one, and the F1 offspring is allowed to self-pollinate. The predicted outcome of the F2 is diagrammed in the Punnett square shown in the figure, where 1, 2, 3, and 4 represent the genotypes corresponding to each box within the square. Which of the boxes marked 1-4 correspond to plants with a heterozygous genotype? O 1 only O 1, 2, and 3 2 and 3 2, 3, and 4 4) 3.arrow_forward
- Consider this cross in pea plants: Tt Rr yy Aa × Tt rr Yy Aa, whereT = tall, t = dwarf, R = round, r = wrinkled, Y = yellow, y = green,A = axial, a = terminal. What is the expected phenotypic outcomeof this cross? Have one group of students solve this problem bymaking one big Punnett square, and have another group solve it bymaking four single-gene Punnett squares and using the multiplication method. Time each other to see who gets done first.arrow_forwardCross the two individual heterozygous for two traits found in two different chromososmes. These two individuals have the following genes: G=yellow pea; g=green pea; W smooth pea; w wrinkled pea. GgWwxGgWw A.give the phenotypes of their offsprings with their specific probabilities and phenotypic ratio B.write the genotypes of their offsprings with their probabilities and give the genotypic ratio Hint GgxGg=1/4 GG+1/2Gg+1/4=3/4+1/4g WwxWw=1/4WW+1/2Ww+1/4ww=3/4W+1/4warrow_forwardPetunia flower color is governed by two alleles, but neither allele is truly dominant over the other. Petunias with the genotype RR are red-flowered, those that are heterozygous (RW) are pink, while those with the (WW) genotype have white flowers. This is an example of incomplete dominance. a. If a white-flowered plant is crossed with a red-flowered plant, what is the genotypic ratio of the F1. b. What is the phenotypic ratio of the F1. c. If two of the F1 offspring were crossed, what phenotypes would appear in the F2?. d. What would be the genotypic ratio in the F2 generation?arrow_forward
- In garden pea plants, axial flower location is dominant (A) to terminal flower location (a). If two plants that are heterozygous for axial flower location are crossed, what is the probability that the first two offspring will have axial flower location?arrow_forwardAssume that the trihybrid cross AABBrr x aabbRR is made in a plant species. Assume that A and B are dominant alleles, but there is no dominance effect of alleles at the R locus. a) How many different gametes are possible in the F1generation? What are the genotypes of these gametes? b) What is the probability of the parental aabbRR genotype in the F2 progeny? c) What proportion of the F2 progeny would be expected to be homozygous for all three genes?arrow_forwardA female fruit fly with vermilion eyes and normal wings is crossed with a male with normal red eyes and cut wings. The F₁ progeny consist of females with red eyes and normal wings, and males with vermilion eyes and normal wings. When the F₁ progeny are interbred, the F2 consists of two types of females-vermilion eyes, normal wings (1/2) and red eyes, normal wings (1/2), and two types of males- vermilion eyes, normal wings (1/2) and red eyes, cut wings (1/2). Are the genes for eye colour and wing type X-linked or autosomal? Both genes are X-linked. The eye-colour gene is X-linked and the wing-type gene is autosomal. The eye-colour gene is autosomal and the wing-type gene is X-linked. Both genes are autosomal. More than one of the choices is consistent with the data.arrow_forward
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