One true-breeding line of mice is obese and dark, and the other true-breeding li

Question

One true-breeding line of mice is obese and dark, and the other true-breeding line is lean and light. Dark is dominant to light, but obese and lean exhibit incomplete dominance. The two genes involved are on separate chromosomes. What proportion of offspring from a dihybrid cross should be dark and intermediate between obese and lean? A) 1/16. B)1/4. C)9/16. D) 3/16. E) 3/8.

Fruit color in the pepper Capsicum annuum is an example of a two-gene interaction. A pure-breeding plant with red fruit is crossed with a pure-breeding plant with cream fruit. If you crossed a resultant F1 plant with an orange plant having the genotype yyCc, what proportion of the offspring would be peach? A) 0. B) 3/8. C) 3/16. D) 1/16. E) 1/8.

I know the correct answer is to both questions is E but I have no idea how to find them. Thank you.

Fruit color in the pepper Capsicum annuum is an example of a two-gene interaction. A pure-breeding plant with red fruit is crossed with a pure-breeding plant with cream fruit. If you crossed a resultant F1 plant with an orange plant having the genotype yyCc, what proportion of the offspring would be peach? A) 0. B) 3/8. C) 3/16. D) 1/16. E) 1/8.

Explanation / Answer

Obese is represented by allele O, lean represented by o

Dark represented by D and light represented d

Obese and dark mice OODD X lean and light mice oodd

OoDd

Mid way between lean and obese and Dark

OoDd

Mid way between lean and obese and Dark

OoDd

Mid way between lean and obese and Dark

OoDd

Mid way between lean and obese and Dark

F2 generation:

OODD

Obese Dark

OODd

Obese dark

OoDD

Mid way between lean and obese and Dark

OoDd

Mid way between lean and obese and Dark

OODd

Obese dark

OOdd

obese dark

OoDd

Mid way between lean and obese and Dark

Oodd

Mid way between lean and obese and light

OoDD

Mid way between lean and obese and Dark

OoDd

Mid way between lean and obese and Dark

ooDD

lean and dark

ooDd

lean and dark

OoDd

Mid way between lean and obese and Dark

Oodd

Mid way between lean and obese and light

ooDd

lean and dark

oodd

lean and light

MIdway between obese and lean and dark 6/16= 3/8 (E)

2. Red colour by R

Orange colour C

Yellow- Y

Pure bred red RRccy

Pure bred cream rrccyy

F1 generation Rrccyy X yyCcrr

Rrcc X rrCc ( yy is same for both)

Rrcc

Peach

Rrcc

Peach

Peach = 2/16= 1/8 (E)

od od OD

OoDd

Mid way between lean and obese and Dark

OoDd

Mid way between lean and obese and Dark

OD

OoDd

Mid way between lean and obese and Dark

OoDd

Mid way between lean and obese and Dark

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