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billyray billyray
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4 years ago
1. Two genes, N and O, are 27 map units apart. If parents heterozygous for these genes were test crossed, and 500 offspring resulted, how many would be recombinants for genes N and O?
Select one:
a. 27
b. 130
c. 315
d. 135
e. 140


2. The recombinant frequency of two genes, A and B, located on the same chromosome is 38%.

Parents heterozygous for genes A and B were test crossed, and 250 offspring resulted. How many of the offspring would have parental genotypes for genes A and B?




3. Neurofibromatosis-1 (NF1) is an autosomal dominant disorder where tumours form in the base layer of the skin or in nerve tissues.
What is the probability that individuals II-1 and II-2 will have a son with NF1? (attachment)
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bio_manbio_man
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#2
4 years ago
thank you!
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