Question

Help!

A species of cactus has two alleles for the length of its spines: long spines
(L) and short spines (). The Punnett square below predicts the outcome of a
cross between two cacti, one LL and the other Ll for length of spines.

What phenotype ratio should be observed in the offspring of this cross?

Answer 1

Answer: 4 : 0 (long spines to short spines)

Step-by-step explanation:

Dominant allele: L

Recessive allele: l

When is there at least one dominant allele in the phenotype it shows the dominant trait (long spines)

There has to be two recessive alleles to make the phenotype the recessive trait (short spines).

Therefore since there is one L in every box, all of the offspring will show the dominant trait (long spines).

Hope that helps!