Question

Flower color in snapdragons is due to a gene with incomplete dominance: CRCR plants have red flowers, CRCW have pink flowers, and CWCW plants have white flowers. Which cross is expected to yield progeny with flower colors in a ratio of 1 red:1 pink?

Answer 1

The question is incomplete. The complete question is:

Question: Flower color in snapdragons is due to a gene with incomplete dominance: CRCR plants have red flowers, CRCW have pink flowers, and CWCW plants have white flowers. Which cross is expected to yield progeny with flower colors in a ratio of 1 red:1 pink?

A. CRCR × CRCW

B. CRCR × CWCW

C. CRCW × CRCW

D. CRCW × CWCW

E. CWCW × CWCW

Answer:

A. CRCR × CRCW

Explanation:

According to the given information, the flower color gene in snapdragon exhibits incomplete dominance. When a snapdragon plant with red flowers is crossed with a snapdragon plant with pink flowers, it obtains progeny in following phenotype ratio= 1 Red (CRCR): 1 Pink (CRCW).

Here, the genotype of the parent with the red flowers is CRCR and that of the parent plant with pink flowers is CRCW. The parent plant with pink flowers produces two types of gametes carrying CR or CW alleles.  Random fusion of gametes of the two parent plants obtains the progeny in 1 red: 1 pink ratio.