Test: ACT Science

Dominant alleles (D) produce dominant characteristics; recessive alleles (d) produce recessive characteristics.  Dominant alleles are expressed whenever present (DD, Dd) but recessive alleles are expressed only when the dominant allele is absent (dd) 

A study was done in which the visual traits of two plants and their offspring was tested.  In this study, Plant A, a Tall Purple plant, was mated with Plant B, a Tall Pink plant.  It has been determined that the dominant trait for height is tall (H) and the dominant trait for color is purple (P). 

Breeding both plants will result in offspring that have recessive and dominant traits.  The chart below contains all the possibilities for their offspring. 

Figure 1.

Parent A

Parent B

Tall (HH)

Tall (Hh)

Purple (Pp)

Pink (pp)

 

Figure 2.                     HH Pp x Hh pp    Offspring

 

HP

HP

Hp

Hp

Hp

HHPp

HHPp

HHpp

HHpp

Hp

HHPp

HHPp

HHpp

HHpp

hp

HhPp

HhPp

Hhpp

Hhpp

hp

HhPp

HhPp

Hhpp

Hhpp

1.

Is it possible that either plant from Figure 1 had at least one short parent?  

Plant A No, Plant B Yes

Plant A No, Plant B No

Plant A Yes, Plant B No

Plant A Yes, Plant B Yes

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