March 27, 2015

Homework Help: Genetics

Posted by AJ on Friday, September 16, 2011 at 4:42pm.

1) The F2 progeny from a cross exhibits a modified dihybrid ratio of 9:7 instead of 9:3:3:1. What phenotype ratio would be expected from a testcross of the F1 progeny?

2) In Drosophila, mutants a through g all have a white eye phenotype. The following data shows the results of pairwise combinations in a complementation test:
a b c d e f g
g + - + - + + -
f - + - + + -
e + + + + -
d + - + -
c - + -
b + -
a -

How many genes are present?
Which are defects in the same gene?

3) A male Drosophila fly is found with white eyes. How would you determine if the mutant in this fly is the same as Morganís original white fly. Show the cross(es) you would do. You must use proper symbols.

4) What does the term complementation mean? If two different mutations that have the same phenotype complement each other, what can you conclude about those two mutations?

Could you help me with these questions to help me study for my next test?

Answer this Question

First Name:
School Subject:

Related Questions

genetics - Can anyone help me with Genetics? I have some problems and answers ...
Genetics - Show the F1 and F2 progeny phenotypic and genotypic ratios of the ...
General Biology - Genetic Inheritance Exercise 1: F1 Hybrid Cross Results: ...
Biology - Which of the following statements about Mendel's breeding experiments ...
Biology - I am lost in this Genetics Maze. Here is my assignment: Write out a ...
science - The Australian grass tree, from the genus Xanthorrhoea in the lily ...
STATISTICS - The seeds of the garden pea are either yellow or green. A certain ...
biology - Hi there! I have this question for my bio/genetics homework, and I can...
chemistry - 1. Expected phenotypic ratio of green to white progeny: _____:_____...
biology: genetics - In Drosophila melanogaster, cut wings (ct) is recessive to ...