Question

Parthenogenesis:

In bees, males (drones) develop from unfertilized eggs ad are haploid. Females (workers and queens) are diploid and come from fertilized eggs. W (black eyes) is dominant over w (white eyes). Workers of genotype RR or Rr use wax to seal crevices in the hive; rr workers use resin instead. A Ww Rr queen founds a colony after being fertilized by a black-eyed drone bearing the r allele.  

A) What will be the phenotypic ratio,

B) genotypic ratio

C) behaviors of the workers in the new hive?

D) Give the genotypic and phenotypic ratios of the drones in the new hive.

Answer 1

WwRr (queen) x (drone) Wr ---Parents

	Wr (sperm genotype)	Only eggs develops by parthenogenesis produce drones as below
WR	WWRr (black, wax female)	WR (black drone)
Wr	WWrr (black, resin female)	Wr (black drone)
wR	WwRr (black, wax female)	wR (white drone)
wr	Wwrr (black, resin female)	wr (white drone)

A).

Black, wax = 3/8

Black, resin = 3/8

White, wax = 1/8

White, resin = 1/8

Phenotypic ratio = 3:1:1:3

B).

WWRr = 1/8

WWrr = 1/8

WwRr = 1/8

Wwrr = 1/8

WR = 1/8

Wr = 1/8

wR = 1/8

wr = 1/8

Genotypic ratio = 1:1:1:1:1:1:1:1

c).

Behaviors of the workers in the new hive:

Wax used workers = 50%

Resin used workers = 50%

Genotypic ratio of workers = WWRr : WWrr : WwRr : Wwrr = 1:1:1:1

d).

Give the genotypic ratio of the drones = WR : Wr : wR : wr = 1:1:1:1

Phenotypic ratio of the drones = Black : White = 1:1