In a cross of purple flowered heterozygous plants (Pp), the letter P represents the allele for purple flowers and the letter p r
epresents the allele for white flowers. What is the probability that an offspring of this cross expresses plants with purple flower phenotypes? A. 0 B. 1/4 C. 1/2 D. 3/4
This cross involves a single gene coding for flower colour in pea plant where the purple allele (P) is dominant over the white allele (p) since the purple allele masks the expression of the white allele in a heterozygous state (Pp). A cross between two heterozygous plants (Pp) will produce four possible offsprings with genotypes PP, Pp and pp in the ratio 1:2:1.
The PP and Pp genotypes are purple flowered while the pp is white flowered. Hence, the probability of having purple flowered plants from this cross is 3 out of 4 i.e. 3/4.
The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system.