Question

Shown above are non-dividing dilpoid cells from two silk-spitters. Silk spitters (also from Thra) are spider-like creatures that spit webbing to catch prey and produce salive that burns prey. Assume that the “L” locus control web spitting ability ability and big L is dominant over little l; the big L allele specifies silk-spitters capable of spitting webs and little l specifies silk spitters incapable of spitting webs. The “R” locus controls saliva toxicity and big R is dominant over little r; the big R allele specifies toxic saliva and the little r allele specifies nontoxic saliva.

Parent 1 Parent 2

A. What is the genotype of parent 1? (Use chromosomal notation if appropriate)

B. What is the genotype of parent 2? (Use chromosomal notation if appropriate)

C. Draw the what a cell from parent 1 would like in PROPHASE of MEIOSIS I.

E. What are the possible genotypes of the gametes you would expect from Parent 1 (indicate the ratio of the genotypes).

F. What are the predicted genotypic and phenotypic ratios of the progeny that result from a cross between parent 1 and parent 2.

this was all the info given on the HW

Answer 1

From the given image,
Genotype of parent 1 = RRLl
Genotype of parent 2 = RrLl

See the image of prophase-I chromosomes.

Gametes produced by parent 1 = RL and Rl

Parental cross: RRLl X RrLl
Progeny:
RL/RL
Rl/RL
rL/RL
rl/RL
RL/rL
Rl/rL
rL/rL
rl/rL

Homologous pair Homologous pair 10-XXXX DNA replication Before S phase Sister chromatids