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The following F2 results occurred from a typical dihybridcross:
Purple: A_B_ 9/16
White: aaB_ 3/16
White: A_bb 3/16
White: aabb 1/16
If a double heterozygote is testcrossed, what phenotypic ratio isexpected in the offspring?
a) 3 purple: 1 white
b) 3 white: 1 purple
c) All purple
d) 9 white: 7 purple
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The following F2 results occurred from a typical dihybridcross:
Purple: A_B_ 9/16
White: aaB_ 3/16
White: A_bb 3/16
White: aabb 1/16
If a double heterozygote is testcrossed, what phenotypic ratio isexpected in the offspring?a) 3 purple: 1 white
b) 3 white: 1 purple
c) All purple
d) 9 white: 7 purple
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In a dihybrid cross, a pure-bred purple elongate radish variety was crossed with a pure-bred white round radish variety. All F1 radishes were purple and round.
When F1 plants were selfed, the F2 population showed the following phenotypes; 39 purple elongate : 80 purple round : 41 white round. How would you explain this segregation ratio?
| A. White and elongate alleles are dominant; allele for white is genetically linked to allele for elongate | |||||||||||||
| B. Purple and Round alleles are dominant; allele for purple is genetically linked to allele for elongate | |||||||||||||
| C. Purple and white alleles are semidominant; Round allele is dominant to elongate allele | |||||||||||||
| D. Purple and white alleles are codominant; round and elongate alleles are also codominant Which of these are true about heterospory? Choose all that apply.
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Genetics In a hypothetical insect species, eye color may be purple or red, and wings may be long or short. The following table shows the results of two crosses where the parents were obtained from a mixed population that did not breed true.
| Parents | Progeny | |
| Cross 1 | Red long male Red, long female | Males: one half red, long; one half purple long Females: all red, long |
| Cross 2 | Red short male Purple long female | Males, all purple short Females: all red eyed, short |
What is the mode of inheritance for eye color for this insect?
What is the mode of inheritance for wing size?
Assuming that true breeding lines are used which of the following crosses would produce an F2 generation that confirms the mode of inheritance for both traits?
Purple short male X red long female
Red short male X red short female
What phenotypic ratio would you expect to see in the F2 generation?
males: 9/16 red, short; 3/16 purple, short; 3/16 red, long; 1/16 purple, long; females: 9/16 red, short; 3/16 purple, short; 3/16 red, long; 1/16 purple, long
males: 3/4 red, short; 1/4 red, long; females: 3/8 red, short; 3/8 purple, short; 1/8 red, long; 1/8 purple, long
males: 3/8 red, short; 3/8 purple, short; 1/8 red, long; 1/8 purple, long; females: 3/8 red, short; 3/8 purple, short; 1/8 red, long; 1/8 purple, long
males: 3/8 red, short; 3/8 purple, short; 1/8 red, long; 1/8 purple, long females: 3/4 red, short; 1/4 red, long
