Ifi mice, yel.on fur colour (Y) is dominant over grey fur coinur (y) happens that all embryos which are homazygnits for the cominant factor die before birth.
If a colany of heteruzygous mice were intred to produce 300 young live mice, how many of these offspring would be likely to have yellow fur and how many with grey fur’ Use a diagram to show how you arrived at your answer.
(7

In this scenario, we have a population of heterozygous mice (Yy) where yellow fur (Y) is dominant over grey fur (y). To determine the offspring’s fur colors, we can use a simple Punnett square. When we cross two heterozygous mice (Yy × Yy), the potential genotypes of the offspring are: YY, Yy, Yy, and yy. However, since the YY genotype leads to embryos that do not survive, we only consider Yy and yy.

For the Punnett square:

        Y     y
      ---------
    Y |  YY | Yy |
      ---------
    y |  Yy | yy |
      ---------

From this, we see that 3 out of 4 offspring (Yy and yy) will survive, which means 75% of the total offspring are expected to have yellow fur (Yy) and 25% will have grey fur (yy). Therefore, from 300 offspring:

So, 225 mice are likely to have yellow fur, while 75 will have grey fur.