genetics. Correct answers are either bolded or have a check next to them. Please

Question

genetics. Correct answers are either bolded or have a check next to them. Please explain and show work step by step for each. Thank you

Only do #1. Not #2

Chapter 15 1. There is a family with a rare genetic condition that causes teeth to turn black. In an attempt to map this gene, it was noted that in families with the black teeth trait, black teeth segregated together with type B blood in 38 out of 50 cases. In 12 cases they separated in the offspring. The map distance between the black teeth and blood type genes is therefore: ?, 38 ?? ?. 50 ?? ?. 12 ?? D. 24 ?? E. 76 ?? 2. The number of genes in the human genome is estimated to be between: A. 20,000 and 25,000

Explanation / Answer

1.

We have to find out the recombination frequency.

Recombination frequency (RF)= Recombinants/Total offsprings * 100%

=12/50 * 100

=24

1% RF = 1 map unit or 1cM

So, the map distance = 24 cM

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