Two fruit flies produce a generation of 103 offspring, of which 103 had recessive ebony bodies (bb) and 0 had brown bodies (BB or Bb). What can you conclude about the parents of this generation? One parent was heterozygous for body color and the other was homozygous with a brown body. One parent had an ebony body and the other was heterozygous for body color. Both parents were heterozygous for body color. Both parents were homozygous with ebony bodie

Question

Mylee Church

Biology

26 September, 05:51

Two fruit flies produce a generation of 103 offspring, of which 103 had recessive ebony bodies (bb) and 0 had brown bodies (BB or Bb). What can you conclude about the parents of this generation? One parent was heterozygous for body color and the other was homozygous with a brown body. One parent had an ebony body and the other was heterozygous for body color. Both parents were heterozygous for body color. Both parents were homozygous with ebony bodie

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Lydia · Answer 1

The last option, Both parents were homozygous with ebony bodie, is the correct one.

Explanation:

We see all the offspring are bb.

In this case both parents, should also be "bb" so they would be homozygous ebony because that's a recessive trait.

An example: In Bb, b is the recessive trait. Here there's a big B and a small b, then the recessive trait (small b) will be not be seen but the dominant (Big B) will.

So in order for all the offspring to be ebony (bb) which is the recessive trait, none of them can have atleast one B (BB or Bb), then both the parents have to be homozygous for the recessive trait. That means bb.

So the last option, Both parents were homozygous with ebony bodie, is the correct one.