Welcome to InsuranceForums.info!   

Advertisments:


Sponsor Links

Affordable Pet Insurance
Travel Insurance Comparison


Need Lots Of Help On These Questions-it Is All About Genetics!?

Discussion forum for Insurance Agents

Need Lots Of Help On These Questions-it Is All About Genetics!?

Postby Oshea » Sat Oct 07, 2017 7:55 am

2. In drosophila, one gene controls eye colour and another body colour.
The allele, E, for red eyes is dominant to e, the allele for purple eyes.
The allele, B, for grey body is dominant to b, the allele for black body.

A female Drosophila, heterozygous for both the eye-colour gene and the body-colour gene, was crossed with a male, homozygous recessive for both of these genes.


(a) Complete the genetic diagram to show the expected outcome.

Parental genotypes

Genotypes of gametes

Genotypes of offspring

Phenotypes of offspring

Ratio of phenotypes of offspring

(b) The observed outcome is shown in the table below.

Phenotype Number of offspring

Red eyes, grey body 82

Purple, black body 79

Red eyes, black body 13

Purple eyes, grey body16

(i) Give a reason for this unexpected outcome explaining why there

were approximately equal numbers of red-eyed, grey-bodied and

purple-eyed, black-bodied offspring.

______________________________________...

______________________________________...

______________________________________...

______________________________________...

(ii) Explain why they were relatively few red-eyed, black-bodied and

purple-eyed, grey-bodied offspring.

______________________________________...

______________________________________...

______________________________________...

______________________________________...

(iii) Explain why the number of red-eyed, black-bodied offspring is not

exactly equal to the number of purple-eyed, grey-bodied offspring.

______________________________________...

______________________________________...

______________________________________...

______________________________________...
Oshea
 
Posts: 39
Joined: Sun Apr 06, 2014 12:50 am

Return to Insurance Agents

 


  • Related topics
    Replies
    Views
    Last post