Question

in roses, red flowers and long stems are dominant traits. a rose plant that is homozygous for both red flowers and long stems is crossed with a rose plant that is heterozygous for red flowers and homozygous for short stems. what percentage of the offspring will exhibit red, long - stemmed flowers?
○ 25 percent
○ 50 percent
○ 75 percent
○ 100 percent

Explanation:

Step1: Define Genotypes

Let \( R \) = red (dominant), \( r \) = non - red; \( L \) = long (dominant), \( l \) = short.

• Homozygous red, long: \( RRLL \) (produces gametes \( RL \)).
• Heterozygous red, homozygous short: \( Rrll \) (produces gametes \( Rl \) and \( rl \)).

Step2: Perform Punnett Square

	\( RL \)
\( rl \)	\( RrLl \) (red, long)

All offspring (\( RRLl \) and \( RrLl \)) have red (since \( R \) is dominant) and long (since \( L \) is dominant) traits.

Answer:

100 percent