Question

In hamsters, crosses between any two dwarf hamsters always produce both large and dwarf progeny in a ratio of about 1:2 (large : dwarf). Crosses between large hamsters only produce large progeny. Moreover, some crosses between black hamsters produce all black progeny, and some crosses between black hamsters produce both black and brown progeny. Assuming that the size and fur color phenotypes segregate independently, what are the expected phenotypes in the F1 of a cross between a dwarf hamster that is pure-breeding for brown fur color and a large hamster that pure-breeding for black fur color

Answer 1

Refer below.

Step-by-step explanation:

Black dwarf as it were.

Black dwarf and black large as it were.

Brown dwarf and black dwarf as it were.

Brown dwarf, brown large, black dwarf and black large.

Brown large as it were.

Black dwarf and black large as it were.

Answer 2

The correct answer to the question:

what are the expected phenotypes in the F1 of a cross between a dwarf hamster that is pure-breeding for brown fur color and a large hamster that pure-breeding for black fur color? Is:

Black dwarf and black large only.

Step-by-step explanation:

Considering that in this exercise we can have more chances of obtaining dwarf hamsters from the crosses we can analyze that the large phenotype is less common. Thus, the different phenotypes associated with the different colors will be influenced even though when they are independent. The reason behind this is probability and recessiveness, as well as dominance. However, the F1 of the cross will only allow the hamsters to be produced in black colors due to the combination of the phenotypes. Because Black is dominant by the association of outstanding results provided as examples.