Lab report, human genetics
DataTable 1:Trait Characteristicsfor Exercise 1 | |||||
# | Trait | Allele from Mother | Allele from Father | Child’s genotype | Child’s Phenotype (written) |
1 | Faceshape
● AA,Aa aa
● Round Square | a | A | Aa | Round |
2 | Chin size
● BB,Bb bb
● Prominent Average | B | b | Bb | Prominent |
3 | Cleftchin
● CC,Cc cc
● Cleftchin No cleft | C orc | C orc |
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4 | Hair type
● DD Dd dd
● Straight Wavy Curly | D ord | D ord |
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5 | Widow’s peak
● EE, Ee ee
● Widowspeak Absent | E ore | E ore |
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6 | Whiteforelock
● FF, Ff ff
● Whiteforelock Absent | F orf | F orf |
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7 | Eyeshape
● GG,Gg gg
● Almond shape Roundshape | Gorg | Gorg |
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8 | Eyeslantedness
● HH,Hh hh
● HorizontalUpwardslant | H orh | H orh |
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9 | Eyelashes
● II,Ii ii
● Long lashes Short lashes | Iori | Iori |
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10 | Eyebrowthickness
● JJ,Jj jj
● Thick Thin | Jorj | Jorj |
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11 | Eyebrowlength
● KK,Kk kk
● SeparatedbrowsBrowsjoined | Kork | Kork |
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12 | Lip thickness
● LL,Ll ll
● Thick lips Thin lips | L orl | L orl |
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13 | Dimples
● MM, Mm mm
● Dimples No dimples | M or m | M or m |
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14 | Nose shape
● NN, Nn nn
● Round Pointed | N or n | N or n |
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15 | Nostril shape
● OO,Oo oo
● Round Pointed | O oro | O oro |
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16 | Earlobe attachment
● PP,Pp pp
● Free Attached | Porp | Porp |
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17 | Darwin’s earpoint
● QQ,Qq qq
● Pointed Pointabsent | Qorq | Qorq |
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18 | Cheekfreckles
● SS, Ss ss
● Present Absent | S ors | S ors |
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19 | Foreheadfreckles
● TT, Tt tt
● Foreheadfreckles Absent | T ort | T ort |
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Exercise 1:genotype toPhenotype
Observations
A. Why was the male chosen to determine the sex of the child?
B. Draw a picture of the compiled traits.
C. If this activity was repeated two or three times would the offspring images change?Explain
your answer.
Exercise 2: PunnettSquares
Questions
Use a Punnettsquare to solve the following scenarios. You MUST INCLUDE THE PUNNET SQUARE AS PART OF YOUR ANSWER FOR EACH OF THESE PROBLEMS.
A. Dominant:cheekfreckles
Recessive:no cheekfreckles
(Pleasenotethatthistraitismorecomplicatedthandescribedinthislabexercise,butforlearning purposes, assume thatthis is correct.)
Amanwithaheterozygousgeneforfrecklesonhischeekshasachildwithawomanwhodoesnot havefrecklesonhercheeks.Whatisthelikelihoodthattheirsonwillhavefrecklesonhischeeks?
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| Father ♂ | |
| Gametes |
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Mother ♀ |
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B. Dominant:normal; no cysticfibrosis
Recessive:cysticfibrosis
Awomanhasahistoryofcystic fibrosis inherfamily,andfoundoutthatshehasthegenefor cysticfibrosis,butisnotaffectedbythegene.Herhusbandalsohasahistoryofcysticfibrosisin hisfamily.Hegottestedyesterdayandfoundthatheisalsoacarrierforthedisease, butisnot affectedbyit.Theyaregoingtohaveababyintwomonths.Whatisthelikelihoodthattheirbaby will have cysticfibrosis?
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| Father ♂ | |
| Gametes |
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Mother ♀ |
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C. Dominant:normal; no Tay-Sachs
Recessive:Tay-Sachs
AmanisacarrierforTay-Sachs.Heisgoingtohaveachildwithawomanwhohashomozygous normal genes.Whatarethechances thattheywill havea child who has Tay-Sachsdisease?
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| Father ♂ | |
| Gametes |
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Mother ♀ |
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D. Dominant:Roundface Dominant:Prominentchin
Recessive:Squareface Recessive:Non-prominent chin
(Pleasenotethatthistraitismorecomplicatedthandescribedinthislabexercise,butforlearning purposes, assume thatthis is correct.)
Awomanwith heterozygousgenesfora roundfaceshape and a chin thatis not prominenthas a childwithamanwhohasasquarefaceandhomozygousgenes foraprominentchin.Whatare thechances thatthechild has a squarefacewith a prominentchin?
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| Father ♂ | |
| Gametes |
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Mother ♀ |
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E. Dominant:Huntington’sdisease Dominant:normal; no cysticfibrosis
Recessive:normal; no Huntington’s Recessive:cysticfibrosis
AmanwithHuntington’sdiseaseisalso acarrierforcysticfibrosis.Hiswifehascysticfibrosisbut doesnothaveHuntington’sdisease.Iftheyhaveababy,whatisthelikelihoodthatthebabywill have both Huntington’sdisease and cysticfibrosis?
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| Father ♂ | |
| Gametes |
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Mother ♀ |
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F. X-linkeddominanttrait:no colorblindness
X-linkedrecessive trait:colorblindness
Acolor-blindman marriesa non-color-blindwomanwho is not a carrierfor colorblindness. Whatarethechances thattheywill havea son who is also color-blind?
Whatarethechances thattheywill havea daughterwho is a carrierfor colorblindness?
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| Father ♂ | |
| Gametes |
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Mother ♀ |
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Omit pedigrees.
11 years ago
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