Inheritance

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Question 3
Hard

In a species of insect, the gene for wing shape (alleles N N\,N for normal wings, n n\,n for vestigial wings) and the gene for body colour (alleles B B\,B for grey body, b b\,b for black body) are autosomally linked.

A heterozygous female insect with the chromosomal arrangement shown below is crossed with a homozygous recessive male (nnbbnnbbnnbb).

Chromosomal arrangement in the heterozygous female

What percentage of the offspring from this cross are expected to have a normal wing shape and a black body?

6%6\%6%

12%12\%12%

44%44\%44%

25%25\%25%

Inheritance Questions

  1. GCSE
  2. /Biology
  3. /Inheritance