2.A scientist observes a population of lizards with three differentcolor throat

Question

2.A scientist observes a population of lizards with three differentcolor throat sacs: red,

orange and yellow. These throat sacs are used in territorialdisplays to other lizards.

a.The scientist observes offspring of six different pairs ofparents. For each pair,

both parents had orange throat sacs. Each nest contains 6offspring. The number

ofoffspring with red:orange:yellow throats in each nest is:

1red, 3 orange, 2 yellow

2red, 2 orange, 2 yellow

0red, 4 orange, 2 yellow

4red, 0 orange, 2 yellow

1red, 4 orange, 1 yellow

1red, 5 orange, 0 yellow

Using Mendelian genetics, what is the simplest explanation(that which requires

thefewest genes) for this result? (2 points)

b. If one of the redoffspring from (a) mated with one of the orange offspringfrom

(a), what would be theexpected ratio of red:orange:yellow throats in theresulting

offspring? Show yourwork! (2 points)

I am a bit confused on howto answer this question. Any help would be muchappreciated.

Thanks!!

Jen

Explanation / Answer

a. Well the fewest genes that could be used would be 2 with adominant and a recessive gene so I would start there. Then Iwould notice right away that one of the colors can be made bymixing the other 2 which would indicate incomplete dominance or thecombination of a dominant and a recessive gene is a mix of the2. b. With figuring out a. all you have to do for b. is setup a punnet square with the gene comination for orange on one sideand the the gene combination for red on the other side and make aratio red:orange:yellow.

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