The mouse of the yy genotype is gray, Yy – yellow, YY – digest on the embryonic stage.

The mouse of the yy genotype is gray, Yy – yellow, YY – digest on the embryonic stage. What will be the offspring of the following parents: yellow × gray; Yellow × yellow? What crossing can we expect a more numerous litter?

Mm – yellow
Mm – gray
Mm – do not survive
P1: Women. Mm * husband. Mm.
Gamets: M m; m.
F1: Mm (yellow); mm (gray)
Based on the conditions of the task, when crossing these individuals, all offspring survives and divides 1: 1.
50% yellow and 50% gray.
P2: Women. Mm * husband. Mm.
Gamets: M m; M m.
F2: MM (do not survive); Mm (yellow); Mm (yellow); mm (gray)
In the second embodiment, the appearance of not surviving offspring is possible (mm) – 25%.
50% of the hybrids are yellow and 25% gray