In fruit flies, black body type is a recessive variant of the wild-type brown body. You cross two true- breeding black-bodied flies, and the resulting offspring all have brown bodies. Which of the following best explains this result? O each black fly had a mutation in a different gene O the black body mutation is dominant to the wild type the two black flies had mutations in the same gene O the black body mutations are codominant

In fruit flies, black body type is a recessive variant of the wild-type brown body. You cross two true- breeding black-bodied flies, and the resulting offspring all have brown bodies. Which of the following best explains this result? O each black fly had a mutation in a different gene O the black body mutation is dominant to the wild type the two black flies had mutations in the same gene O the black body mutations are codominant

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter5: The Inheritance Of Complex Traits

Section: Chapter Questions

Problem 8QP: Clubfoot is a common congenital birth defect. This defect is caused by a number of genes but appears...

See similar textbooks

Similar questions

Red–green color blindness in humans is due to an X-linked recessive gene. A woman whose father is color blind possesses one eye with normal color vision and one eye with color blindness. Q. Propose an explanation for this woman’s vision pattern. Assume that no new mutations have spontaneously arisen.
Red–green color blindness in humans is due to an X-linked recessive gene. A woman whose father is color blind possesses one eye with normal color vision and one eye with color blindness. a. Propose an explanation for this woman’s vision pattern. Assume that no new mutations have spontaneously arisen. b. Would it be possible for a man to have one eye with normal color vision and one eye with color blindness?
Two different genes control the expression of kernelcolour in Mexican black corn: a black pigment gene (B)and a dotted pigment gene (D). Gene B influences theexpression of gene D. The dotted phenotype appearsonly when gene B is in the homozygous recessivestate. A colourless variation occurs when both genesare homozygous recessive.After pure-breeding black-pigmented plants werecrossed with colourless plants, all offspring wereblack-pigmented. The genotypes of the parents of these F1 offspring could bea. BBDD × bbddb. BbDD × bbddc. Bbdd × bbDDd. bbDD × BBdd
Two different genes control the expression of kernelcolour in Mexican black corn: a black pigment gene (B)and a dotted pigment gene (D). Gene B influences theexpression of gene D. The dotted phenotype appearsonly when gene B is in the homozygous recessivestate. A colourless variation occurs when both genesare homozygous recessive.After pure-breeding black-pigmented plants werecrossed with colourless plants, all offspring wereblack-pigmented. Plants of the F1 generation are suspected of being heterozygous for both genes. A test crossof colourless plants with the heterozygote plants should produce a genotypic ratio in theoffspring ofa. 1:0b. 3:1c. 2:1:1d. 1:1:1:1
In Drosophila, a cross (cross 1) was made between twomutant flies, one homozygous for the recessive mutationbent wing (b) and the other homozygous for the recessivemutation eyeless (e). The mutations e and b are alleles oftwo different genes that are known to be very closelylinked on the tiny autosomal chromosome 4. All the progeny had a wild-type phenotype. One of the female progeny was crossed with a male of genotype b e/b e ; we willcall this cross 2. Most of the progeny of cross 2 were of theexpected types, but there was also one rare female ofwild-type phenotype.a. Explain what the common progeny are expected tobe from cross 2.b. Could the rare wild-type female have arisen by (1)crossing over or (2) nondisjunction? Explain.
In mice, dwarfism is caused by an X-linked recessive allele, and pink coat is caused by an autosomal dominantallele (coats are normally brownish). If a dwarf femalefrom a pure line is crossed with a pink male from a pureline, what will be the phenotypic ratios in the F1 and F2 ineach sex? (Invent and define your own gene symbols.)
In Drosophila, an X-linked recessive mutation, scalloped (sd),causes irregular wing margins. Diagram the F1 and F2 resultsif (a) a scalloped female is crossed with a normal male; (b) ascalloped male is crossed with a normal female. Compare theseresults to those that would be obtained if the scalloped gene wereautosomal.
In flies, long wings (W) are dominant to short wings (w). Two homozygous recessive flies are crossed.
Two different genes control the expression of kernelcolour in Mexican black corn: a black pigment gene (B)and a dotted pigment gene (D). Gene B influences theexpression of gene D. The dotted phenotype appearsonly when gene B is in the homozygous recessivestate. A colourless variation occurs when both genesare homozygous recessive.After pure-breeding black-pigmented plants werecrossed with colourless plants, all offspring wereblack-pigmented. 1. The genotypes of the parents of these F1 offspring could bea. BBDD × bbddb. BbDD × bbddc. Bbdd × bbDDd. bbDD × BBdd 2. Plants of the F1 generation are suspected of being heterozygous for both genes. A test crossof colourless plants with the heterozygote plants should produce a genotypic ratio in theoffspring ofa. 1:0b. 3:1c. 2:1:1d. 1:1:1:1
In Drosophila, the vestigial wings recessive allele,vg, causes the wings to be very small. A geneticistcrossed some true-breeding wild-type males to some vestigial virgin females. The male and female F1 flieswere wild type. He then allowed the F1 flies to matewith one another and found that 1/4 of the male andfemale F2 flies had vestigial wings. He dumped thevestigial F2 flies into a morgue and allowed the wildtype F2 flies to mate and produce an F3 generation.a. Give the genotype and allele frequencies amongthe wild-type F2 flies.b. What will be the frequencies of wild-type andvestigial flies in the F3?c. Assuming the geneticist repeated the selection againstthe vestigial F3 flies (that is, he dumped them in amorgue and allowed the wild-type F3 flies to mate atrandom), what will be the frequency of the wild-typeand mutant alleles in the F4 generation?d. Now the geneticist lets all of the F4 flies mate atrandom (that is, both wild-type and vestigial fliesmate). What will be the…
.Certain forms of human color blindness are inherited as X-linkedrecessive traits. Hemizygous males are color-blind, but heterozygous females are not. However, heterozygous females sometimeshave partial color blindness.A. Discuss why heterozygous females may have partial color blindness.B. Doctors identified an unusual case in which a heterozygousfemale was color-blind in her right eye but had normal colorvision in her left eye. Explain how this might have occurred.
Red–green color blindness in humans is due to an X-linked recessive gene. A womanwhose father is color blind possesses one eye with normal color vision and one eye with colorblindness.(a) Propose an explanation for this woman’s vision pattern.(b) Would it be possible for a man to have one eye with normal color vision and one eye withcolor blindness?.