Based on the law of segregation, what proportion of the f2 plants (which are in the ratio 1 rr : 2 rr : 1 rr) would be expected to produce f3 progeny phenotypes in a ratio of 3 dominant : 1 recessive? s

2/4 or 1/2 of the F2 plants

Explanation:

According to the given information, a cross between two heterozygous monohybrid with genotype "Rr" gives a F2 progeny. The genotype ratio of the obtained F2 progeny is 1 RR : 2 Rr : 1 rr.

Out of the total F2 progeny, 2/4 F2 plants are heterozygous dominant for the studied gene. Self crossing between two of these plants would produce the F3 progeny in 3 dominant: 1 recessive ratio.

Once an egg is fertilized by a sperm, a zygote is formed. The zygote divides into multiple cells in a process known as cleavage, triggering the beginning of embryonic differentiation. ... Cells in these three layers will give rise to different parts of the organism. The endoderm eventually becomes the gut.Mar 3, 2011