In sweet peas, curly tendrils is dominant to straight tendrils, and blue flowers is dominant to...
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In sweet peas, curly tendrils is dominant to straight tendrils, and blue flowers is dominant to white flowers. A plant that is heterozygous for curly tendrils and heterozygous for blue flowers is crossed to another plant that is heterozygous for curly tendrils and has white flowers.
Which of the following is correct about the offspring of this cross?
There are two correct answers. Each correct answer is worth 50 points. Select both answers for full credit.
a. 3/8 of the offspring will have curly tendrils and blue flowers
b. 3/8 of the offspring will have straight tendrils and white flowers
c. 3/16 of the offspring will have straight tendrils and blue flowers
d. 1/8 of the offspring will have straight tendrils and blue flowers
e. 1/8 of the offspring will have curly tendrils and white flowers
f. 3/16 of the offspring will have curly tendrils and white flowers
g. 9/16 of the offspring will have curly tendrils and blue flowers
h. 1/16 of the offspring will have straight tendrils and white flowers
Homework Answers
Option 'a' and 'd' are correct.
Explanation -
Let's suppose dominant trait curly tendrils is controlled by 'C' (capital letter) gene and recessive trait straight tendrils is controlled by 'c' (small letter) gene.
On the other hand, dominant trait blue flowers is controlled by 'B' (capital letter) gene and recessive trait white flowers is controlled by 'b' (small letter) gene.
Now, the genotype of the parent, which is heterozygous for curly tendrils and heterozygous for blue flowers, should be - "CcBb". The genotype of the other parent, which is heterozygous for curly tendrils and has white flowers, should be "Ccbb".
Next part is described in the following pictures-
From the Punnett square we can see that out of 8 offsprings 3 will have curly tendrils and blue flowers [ one CCBb, two CcBb] and one will have straight tendrils and blue flowers [ccBb].
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