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Genotyping and Phenotyping Traits

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1. Would the person who could roll his/her tongue know their genotype for certain? Why?
2. What might determine whether a person who shows the dominate characteristic is homozygous dominant or heterozygous?
3. Now, knowing the details of red-green deficiency, please explain why males tend to show sex-linked traits more than females? Can you think of any other sex-linked traits?
4. Need to do a table with the following information by titles:
Trait, Possible Phenotype, Sample size of one or two family members or co-workers, Determine each person's Dominant #, Recessive # Personal Phenotype, Possible Genotype

Categories are:
Tongue Rolling T or t Thumb crossing C or c Handedness R or r Chin Dimple K or k
Widow's Peak W or w Mid-digit Hair M or m Toe Length S or s Freckles F or f
Detached Earlobes E or e Hitch-hikers thumb H or h Cheek Dimple D or d Iris Pigment I or i

5. If you do not show the trait write the representative lower case letter in the phenotype space. If you do not show the trait you can also be certain your genotype may be a homozygous recessive condition represented by two small letters. Write your genotype for each trait.
6. If you show the trait, write XX and Xx in the spaces above since you do not know for certain which set of alleles you possess.

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Solution Summary

Genotyping and phenotyping traits are examined.

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See Also This Related BrainMass Solution

How to Calculate Recombination Frequency

Calculate the recombination frequency between RC4-124 and RC-280 based on above numbers.

~12,000 F2 (304 orginal F2)
134 individuals with ss at one marker and ns at the other marker.were grown for phenotype.

Then the attached document, at the bottom of the first page column 2, there is some information that may help.

I don't understand how to set up the recombination frequency problem

Do I divide 134 by 12,000 and then times 100% ?

Please help me.

Thank you.

Sincerely,

Pam

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