Question

The students performed a second cross the parental cross was between Nies that are true breeding for gray bodies and long wings and flies that are true breeding for ebony bodies and curly

wings. They crossed pairs of F,fies and determined the phenotypes of the resulting F ies. The students found an approximate 3:1 ratio of this with the dominant phenotype (gray bodies

and long wings) to ties with the recessive phenotype (ebony bodies and curly wings) only a few of the flies expressed the dominant phenotype of one trait and the recessive phenotype of the

other trait.

(a) In the first analysis, all of the F, Mies from the students' crosses have the identical phenotype with respect to body color and wing shape, but the F, flies have four different phenotypes

Describe how fertilization contributes to this genetic variability.

Answer 1

Answer:

See the answer below.

Explanation:

Fertilization contributes to genetic variability through random fusion of male and female gametes.

Gametes are generated during the process of meiotic cell division. Male gametes are generated through spermatogenesis while female gametes are generated through oogenesis.

The male gamete contains haploid paternal chromosome while the female gamete contains haploid maternal chromosome.

During fertilization, each parent is able to contribute a unique set of the haploid chromosome to form a diploid zygote. This process of gene shuffling and random fusion results in more genetically variable offspring.

Answer 2

The fertilization contributed to the genetic variability is explained below:

The following information should be considered;

• Fertilization contributes to genetic variability via instant fusion of male and female gametes.
• Gametes are produced at the time of the process of meiotic cell division.
• Male gametes are produced via spermatogenesis while on the other hand female gametes are produced via oogenesis.
• The male gamete comprise of haploid paternal chromosome while on the other hand the female gamete comprise haploid maternal chromosome.
• At the time of fertilization, each parent is capable to contribute a unique set of the haploid chromosome to form a diploid zygote.
• This process of gene shuffling and random fusion results in more genetically variable offspring.

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