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Help! Genetics - homozygous recessive lethal?
If an allele is homozygous recessive lethal, and two heterozygotes are breed, what is the ratio of genotypes in the offspring produces
a. 1:2:1
b. 1:3:1
c. 1:2
d. 1:3
e. 1:4
I know it's either b or c.
1 Answer
- Anonymous8 years agoFavorite Answer
If the homozygous recessive genotype is lethal, then offspring born this way won't survive.
So, you won't get your usual 1:2:1 ratio as you usually do for heterozygous crosses, instead, we get a 1:2:0 ratio, or...
a 1:2 ratio. So yes, C is the correct answer. :)