Log in
Biology
2
answers
0
watching
39
views
20 Feb 2018

Consider three gene pairs: Aa, Bb, Cc, each of which affects adifferent feature.
These three gene pairs assort independently of one another.Assuming typical Mendelian inheritance, determine the expectedfrequency of the phenotype displayed from the genotype aBc based ona cross of triply heterozygous parents [e.g., (AaBbCc) x
(AaBbCc)].

Watch
2
answers
0
watching
39
views

For unlimited access to Homework Help, a Homework+ subscription is required.

31 May 2024

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share
Already have an account? Log in
Share

Related textbook solutions

Molecular Cell Biology
8 Edition,
Lodish
ISBN: 9781464183393
Biology: Science for Life with Physiology
6 Edition,
Belk
ISBN: 9780134555430
Concepts of Biology
OER Edition,
Openstax
ISBN: 9781938168116
Biology
2nd Edition, 2013
Openstax
ISBN: 9781947172517
Essentials of Biology
5 Edition,
Mader
ISBN: 9781259660269

Related questions

The following cross involving three genes was performed: Aa Bb Cc x aa bb cc, and the phenotypes and number of progeny are shown below. Each pair of alleles exhibits simple dominance and recessiveness.

Progeny Phenotype Number of progeny

A B C 181

a b c 169

a B C 77

A b c 73

A B c 69

a b C 81

a B c 173

A b C 177

1000

Which pair of genes is clearly linked to each other, and which gene is clearly unlinked to the other two? What is the map distance between the two linked genes? HINT: Compare two genes at a time, ignoring the other gene (i.e. combine classes so you only have the four classes for each pair of genes: A&B, B&C, and A&C), and check if they are linked or assort independently (this will be obvious, even without a c2 test).

Canaries: Green (wild-type) Pied phenotype Yellow type

Canaries are popular pets and easy to breed in captivity. Additionally, they display great phenotypic diversity, which allows you to do some interesting genetic investigations with them.

When you take a canary from a true-breeding green strain and cross it with a canary from a true-breeding yellow strain, all offspring display the pied phenotype. Based on this you suspect that this color variation is inherited by a gene with a co-dominant inheritance pattern (showing both phenotypic traits in hybrid phenotypes).

You decide to test this hypothesis. To do so, you take pairs of your hybrid F1 individuals (of pied phenotype), and cross them to produce an F2 generation.

After many dozens of crosses and hundreds of offspring, you arrive at the peculiar ratio of:

3/16 green : 6/16 pied : 7/16 yellow

Which of the following hypotheses are consistent with these data? (Note that not all of these hypotheses are mutually exclusive. Assume that the two genes are independently assorting)

Hint: This problem is very hard to work from the given ratios to what is happening genetically. It is easier to "work backwards" and start with each choice below, and see if you can obtain all or important aspects of the results of your cross when making the assumption that the answer choice is correct.

Select all that apply:

Select one or more:

a. At least one of the genes involved is sex linked.

b. One gene controls production of darker pigment (melanin which appears green when mixed with yellow). A second gene acts as a patterning gene with one allele causing expression and the other non-expression of melanin and when in the heterozygous condition each allele controls melanin expression on different parts of the body so long as the bird's genotype of the first gene allows for the production of melanin.

c. this is a single-gene trait with co-dominance

d. one of the two genes involved displays complete dominance, while the other displays co-dominance.

e. the genes involved are epistatically interacting

f. more than one gene is involved

5. In tomatoes, two alleles of one gene determine the character difference of purple (P) versus green (G) stems, and two alleles of a separate independent gene determine the character difference of cut (C) versus “potato” (Po) leaves. The results for 3 matings of tomato-plant phenotypes are as follows: (2)

This question is all over the internet except it ususlly comes with five matings. This version has 3 matings. It is easy to determine that cut is dominant to potato but I cannot figure out how to justify dominance of color. I need an example, from the mating data, to justify the dominace of either green or purple.

Number of Progeny with Phenotype

Mating

Parental phenotype

P, C

P, Po

G, C

G, Po

1

P,C X G,C

321

101

310

107

2

P, C X G, Po

404

0

387

0

3

P, Po X G, C

70

91

86

77

Based on the information provided in the table determine which alleles are dominant.

What are the most probable genotypes for the parents in each cross?

Possible genotype

Mating 1

Parental phenotype 1: P,C

Parental phenotype 2 : G, C

Mating 2

Parental phenotype 1: P,C

Parental phenotype 2 : G,Po

Mating 3

Parental phenotype 1: P,Po

Parental phenotype 2 : G,C

Weekly leaderboard

Home
Homework Help 3,900,000
Biology 460,000
Start filling in the gaps now
Log in