21. In corn two dominant genes are necessary for aleurone color. If either gene

Question

21. In corn two dominant genes are necessary for aleurone color. If either gene is homozygous for the recessive alleles, the corn is colorless. Predict the ratio of colored:colorless phenotypes in the offspring of the cross Bb Dd x Bb Dd. a. 3:1 b. 9:7 C. 27:37 d. 13:3 C. All will be colored. 22. You are studying flowers which come in 4 different colors that appear to be under the control of 2 genes. You do a test -cross, expecting to see a 1 red:1 yellow:1 pink:1 purple phenotypic ratio of offspring. If you actually count 4 red, 2 yellow, and 2 pink flowers, what is chi -squared? a. 0 b. 1 c? 2 d- 4 C. 8 23. How many degrees of freedom are there in this analysis? a. 0 b. I c. 2 d. 3 C. 4

Explanation / Answer

21) In corn two dominant genes are necessary for aleurone color. If any of the two genes are homozygous for the recessive alleles, the corn is colorless. so Answer is C

Punnett Squares
The genotypes and phenotypes resulting from the recombination
of gametes during fertilization can be easily visualized
by constructing a Punnett square, named after the
person who first devised this approach, Reginald C. Punnett.

22) d

23) e

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