MarianoFalcon
Answered

Westonci.ca is your trusted source for accurate answers to all your questions. Join our community and start learning today! Get detailed and precise answers to your questions from a dedicated community of experts on our Q&A platform. Join our platform to connect with experts ready to provide precise answers to your questions in different areas.

A pea plant that has round seeds has the genotype Rr. It is crossed with a pea plant that has wrinkled seeds and the genotype rr. What is the probability that the offspring will have wrinkled seeds?
(A) 0 percent
(B) 25 percent
(C) 50 percent
(D) 75 percent

Sagot :

iloveonedirection
In order to answer this, you will need to set up a Punett Square (I have attached a picture). 

Since Rr is the genotype of round seeds, we know that round must be dominant to wrinkled, and therefore represented by the allele, R.

Since rr is the genotype of wrinkled seeds, we know that wrinkled must be the recessive trait, and there represented by the allele, r.

Since the Punnett Square shows that the genotype ratio is 2Rr : 2rr, or simplified, 1Rr : 1rr, we now know that there is a 50% chance the offspring will have wrinkled seeds.
View image iloveonedirection

Answer: The correct answer is- (C) 50 percent.

Genotype of parents are- Rr ( representing heterozygous dominant ) and rr ( homozygous recessive).

Dominant trait ( depicted by capital letter allele such as 'R' for round seeds)  masks the expression of recessive trait ( depicted by small letter allele such as 'r for wrinkled seeds').

As per the information in the question, round seeds is a dominant trait ( Rr, expressed in heterozygous dominant form) over wrinkled seeds (rr), which is recessive trait.

When the given parents are crossed, they produce offspring with the genotypes  rr ( showing wrinkled seeds) and Rr ( round seeds) in the ratio 1:1.

Thus, the probability that the offspring will have wrinkled seeds is 50 percent.

Refer punnet square.

View image StaceeLichtenstein
Thanks for stopping by. We strive to provide the best answers for all your questions. See you again soon. Thank you for your visit. We're dedicated to helping you find the information you need, whenever you need it. Westonci.ca is committed to providing accurate answers. Come back soon for more trustworthy information.