2itt s pus) you have identified a new animal species, which has diploid females

Question

2itt s pus) you have identified a new animal species, which has diploid females (2n) and haploid males (In). Females have twenty chromosomes in their cells. A. How many chromosomes do males have in their cells? B. In ONE sentence or phrase, how are gametes formed in males? C. In ONE sentence, propose a mechanism for how sex is determined in this species. D. You isolate different mutants and try to map genes in this species. A legless runt double mutant is mated with wild type animals. The F1 progeny are mated with each other and you saw the following phenotypes in the F2 generation: F2 progeny phenotype Runt Legless 560 Wild type 1600 Runt Legless110 Total No 130 2400 The stripe and runt genes are on the same chromosome (see below). You cross a stripe runt double mutant with a legless mutant. The F1 progeny are testcrossed with the stripe runt legless triple mutant. You find that all of the Stripe non-Runt recombinants do not have the Legless phenotype and all of the Runt non-Stripe recombinants have the Legless phenotype. E. Is legless on the same chromosome as stripe and runf? Circle one: Yes or No. F. If legless is on the same chromosome, indicate where legless lies on the chromosome diagram and the approximate map distances between legless, stripe, and runt. stripe runt

Explanation / Answer

1. Male(1n) will have 10 chromosomes in the cell.

2. Gametes are formed in males by the process of meiosis.

3. Sex is determined in species genetically, the different alleles or different genes helps defines the sexual morphology of an animal.

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