Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele have sharp spines, whereas homozygous recessive cactuses have dull spines. At the same time, a second gene, N, determines whether or not cactuses have long or short spines. Homozygous recessive cactuses have short spines. A cross between a homozygous sharp-long cactus and a dull short-spined cactus would produce what percentage of sharp-long cacti? Show your Punnett square please.

Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele have sharp spines, whereas homozygous recessive cactuses have dull spines. At the same time, a second gene, N, determines whether or not cactuses have long or short spines. Homozygous recessive cactuses have short spines. A cross between a homozygous sharp-long cactus and a dull short-spined cactus would produce what percentage of sharp-long cacti? Show your Punnett square please.

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter15: Genomes And Genomics

Section: Chapter Questions

Problem 2QP: Hemophilia and color blindness are both recessive conditions caused by genes on the X chromosome. To...

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Gene A controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, A, have sharp spines, whereas homozygous recessive aa cactuses have dull spines. At the same time, a second gene, N, determines whether cactuses have spines at all. Homozygous recessive nn cactuses have no spines at all. a) The relationship between genes A and N is an example of ________________ b) A cactus with sharp spines is crossed with a spineless cactus. All the offspring have spines but approximately half of the 100 offspring have dull spines and half have sharp spines. What are the genotypes of the parent cacti?
Just like in fruit flies, pea plants are a famous model organism for genetics. Pea plants can have purple flowers or white flowers. Let's use P to represent the allele for Purple and p to represent the allele for white. In pea plants, purple flowers are fully dominant to white. Imagine a cross between a heterozygous male plant and a female that is homozygous recessive for flower color. What are all the possible gametes that the FEMALE plant could make? O Pp O p dd
You have a purple-flowered pea plant, but you do not know if it is homozygous (PP) or heterozygous (Pp) for flower color because both genotypes result in the same purple phenotype. Purple color allel (P) is dominant over white flower allel (p). What would you do to determine the genotype of flower color of this plant? Lötfen birini seçin: O a. Crossing the plant with homozygous large flowered pea plant (LL) Ob. Crossing the plant with heterozygous purple flowered pea plant (Pp) Crossing the plant with homozygous dominant purple flowered pea plant (PP) d. Crossing the plant with a plant whose genotype is unknown e. Crossing the plant with homozygous recessive white flowered pea plant (pp)
White fruit color in summer squash is dependent on a dominant gene (W) and colored fruit to the recessive gene (w). In the presence of ww a dominant gene produces yellow color, but when D is not present, the color is green. Give the F2 phenotypes and the proportions expected from crossing (show the diagram) a white-fruited (WWDD) with a green-fruited (wwdd) plant.
Multiple gene pairs may interact to produce a single phenotype. In garden peas, genes C and P are required for pigment production in flowers. Gene C codes for an enzyme that converts a compound into a colorless intermediate product. Gene P codes for an enzyme that converts the colorless intermediate product into anthocyanin, a purple pigment. A flower, therefore, will be purple only if it contains at least one dominant allele for each of the two genes (C__P__). What phenotypic ratio would you expect in the F2 generation following a cross between two double heterozygotes (CcPp)?
Two different genes control the expression of kernel colour in Mexican black corn: black pigment gene B and dotted pigment gene D. Gene B influences the expression of gene D. The dotted phenotype appears only when gene B is in the homozygous recessive state. A colourless variation occurs when both genes are homozygous recessive. After pure-breeding black-pigmented plants were crossed with colourless plants, all of the offspring were black-pigmented. What is the probability of dotted offspring being produced from the test cross described above? (Record your answer as a percentage - do not include a decimal).
A mapping experiment in strawberries shows that the genes for color and plant height are separated by 16cM. In a cross between a heterozygous plant (CcHh) and a homozygous recessive plant, what percent of offspring would inherit a chromosome carrying cH from the heterozygous parent.... 1. if the heterozygous parent’s alleles are in repulsion? _________________ 2. if the heterozygous parent’s alleles are in coupling? _________________
Waxy endosperm (wx), shrunken endosperm (sh), and yellow seedlings (v) are encoded by three recessive genes in corn that are linked on chromosome 5. A corn plant homozygous for all three recessive alleles is crossed with a plant homozygous for all the dominant alleles. The resulting F1 are then crossed with a plant homozygous for the recessive alleles in a three-point testcross. The progeny of the testcross are wx sh V 87 Wx Sh v 94 Wx Sh V 3,479 wx sh v 3,478 Wx sh V 1,515 wx Sh v 1,531 wx Sh V 292 Wx sh v 280 Total 10,756 a. Determine the order of these genes on the chromosome. b. Calculate the map distances between the genes. c. Determine the coefficient of coincidence and the interference among these genes.
In Drosophila, an allele causing vestigial wings is 12.5 mu awayfrom another allele that causes purple eyes. A third gene that affectsbody color has an allele that causes black body color. Thisthird gene is 18.5 mu away from the vestigial wings allele and 6mu away from the allele causing purple eyes. The alleles causingvestigial wings, purple eyes, and black body are all recessive.The dominant (wild-type) traits are long wings, red eyes, and graybody. A researcher crossed wild-type flies to flies with vestigialwings, purple eyes, and black bodies. All F1 flies were wild type.F1 female flies were then crossed to male flies with vestigial wings,purple eyes, and black bodies. If 1000 offspring were observed,what are the expected numbers of the following types of flies? long wings, red eyes, gray bodylong wings, purple eyes, gray bodylong wings, red eyes, black bodylong wings, purple eyes, black bodyshort wings, red eyes, gray bodyshort wings, purple eyes, gray bodyshort wings, red eyes,…
. In the tiny model plant Arabidopsis, the recessive allele hyg confers seed resistance to the drug hygromycin, and her, a recessive allele of a different gene, confers seed resistance to herbicide. A plant that was homozygous hyg/hyg ⋅ her/her was crossed with wild type, and the F1 was selfed. Seeds resulting from the F1 self were placed on petri dishes containing hygromycin and herbicide.a. If the two genes are unlinked, what percentage of seeds are expected to grow?b. In fact, 13 percent of the seeds grew. Does this percentage support the hypothesis of no linkage? Explain. If not, calculate the number of map units between the loci.c. Under your hypothesis, if the F1 is testcrossed, what proportion of seeds will grow on the medium containing hygromycin and herbicide?
Two different genes control the expression of kernel colour in Mexican black corn: a black pigment gene (B) and a dotted pigment gene (D). Gene B influences the expression of gene D. The dotted phenotype appears only when gene B is in the homozygous recessive state. A colourless variation occurs when both genes are homozygous recessive. After pure-breeding black-pigmented plants were crossed with colourless plants, all offspring were black-pigmented. Plants of the F 1generation are suspected of being heterozygous for both genes. A test cross of colourless plants with the heterozygote plants should produce a genotypic ratio in the offspring of A. 1:0 B. 3:1 C. 2:1:1 D. 1:1:1:1
Suppose a mutant fruit fly with blue eyes was recently discovered. It is later determined that the blue eye trait is recessive to the wild-type red eye trait. What is the most common way to represent the mutant and wild-type alleles?. Choices are Mutant: Bl, bl Wild-type: Bl+ , re, bl+, or wt