Acactus can either have long needles (l) or short needles (l). a cactus grower crosses two cacti. the cross is shown in the punnett square below.
what is the phenotype ratio for this cross?
a. four long, zero short
· b. two long, two short
c. three long, one short
d. one long, three short

Option B

Explanation:

Let us assume that Long needles trait is dominant over short needles trait. Also “L” represents the long needle while “l” represents the short needles.  

Therefore “Ll” would represent a  heterozygous dominant genotype.  

Now cross is carried out between  

Ll * ll

Ll, Ll, ll, ll

Out of four offspring two are heterozygous long needled while two are homozygous short needles.  

Hence, option B is correct

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