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BioExcel 124

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In which of the following cases would men be affected more frequently than women?

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In watter van die volgende gevalle sal mans meer gereeld as vroue aangetas word?

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Determine whether the statement below is true or false. Then use it in your mind map to answer 1: is the trait dominant or recessive?

 Dominant traits skip a generation.

 

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Bepaal of die stelling hieronder waar of onwaar is. Gebruik dit dan op jou breinkaart vir antwoord 1: is die eienskap dominant of resessief?

 Dominante eienskappe slaan 'n generasie oor.

 

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In guinea pigs, black hair (B) is dominant to brown hair (b) and short hair (H) is dominant to long hair (h).

A black, long-haired guinea pig (Bbhh) is crossed with a brown, short-haired guinea pig (bbHh).

What percentage of the offspring will be black with long hair?

 

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In konyne, is swart hare (B) dominant teenoor bruin hare (b) en kort hare (H) dominant teenoor lang hare (h). 

'n Swart konyn met lang hare (Bbhh) word gekruis met 'n bruin konyn met kort hare (bbHh). 

Watter persentasie van die nageslag sal swart wees met lang hare?

 

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In rabbits, white fur (W) is dominant to black fur (w), and long ears (E) are dominant to short ears (e).

A breeder mates two rabbits that are heterozygous (WwEe) for both traits.

What is the chance that the offspring will have black fur with long ears?

 

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In hase, is 'n wit pels (W) dominant teenoor 'n swart pels (w), en lang ore (E) is dominant teenoor kort ore (e). 

'n Teler paar twee hase wat heterosigoties is (WwEe) vir beide eienskappe. 

Wat is die kans dat die nageslag 'n swart pels het met lang ore?

 

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In a flowering plant, tall (T) is dominant to short (t), and blue flowers (B) are dominant to white flowers (b).

A tall plant with white flowers (Ttbb) is crossed with a short plant with blue flowers (ttBb).

What is the chance that the offspring will be short with white flowers?

 

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In 'n blomplant is lank (T) dominant teenoor kort (t), en blou blomme (B) is dominant teenoor wit blomme (b). 

'n Lang plant met wit blomme (Ttbb) word gekruis met 'n kort plant met blou blomme (ttBb). 

Wat is die kans dat die nageslag kort is met wit blomme?

 

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Now we'll cross the F1 generation:

BbWw x BbWw

Do the cross by yourself using a Punnett square. In the boxes below, provide the proportions (i.e. the fraction) of each genotype that result from the cross. 

*If you struggle with this, please look at the lecture again as well as the explanation in this activity.

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Nou gaan ons die F1-generasie kruis:

 BbWw x BbWw

Gebruik 'n Punnett-vierkant en doen self die kruising. Verskaf die verhoudings (d.w.s. die breuk) van elke genotipe, in die onderstaande blokkies.

 *As u hiermee sukkel, kyk weer na die lesing en die verduideliking in hierdie aktiwiteit.

 

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In fruit flies, grey body colour and long wings are dominant to black body colour and curly wings.

What are the genotypes and phenotypes of the F1 generation when homozygous flies with grey bodies and long wings are crossed with flies that have black bodies and curly wings?

Use the alleles B & b (body) and W & w (wings). Provide your answer in the following format:

Genotypebody, wings 

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In vrugtevlieë, is grys liggame en lang vlerke dominant teenoor swart liggame en krullerige vlerke.

Wat is die genotipes en fenotipes van die F1-generasie wanneer homosigotiese vlieë met grys liggame en lang vlerke gekruis word met vlieë wat swart liggame en krullerige vlerke het? 

Gebruik die allele B & b (liggam) en W & w (vlerke). Gee jou antwoord in die volgende formaat: 

Genotipeliggaam, vlerke 

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What are the phenotypes that will result from this cross?

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Wat is die fenotipes wat uit hierdie kruising volg?

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In horses, the allele for straight hair (H) is dominant, and the allele for curly hair (h) is recessive.

A horse breeder mates a homozygous dominant mare with a heterozygous stallion.

What is the chance that the offspring will have straight hair? 

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In perde is die alleel vir reguit hare (H) dominant, en die alleel vir krullerige hare (h) resessief. 

'n Perde teler paar 'n homosigotiese dominante merrie met 'n heterosigotiese hings. 

Wat is die kans dat die nageslag reguit hare sal hê?

 

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Many farmers prefer cattle without horns because it is safer for their herds. The allele for no horns (N) is dominant to the allele for the presence of horns (n).

A farmer mates a male with horns to a heterozygous female without horns.

What is the chance that the offspring will have horns? 

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Baie boere verkies vee sonder horings omdat dit veiliger is vir hul kudde. Die alleel vir geen horings (N) is dominant teenoor die alleel vir die teenwoordigheid van horings (n). 

'n Boer paar 'n bul met horings met 'n heterosigotiese koei sonder horings.

Wat is die kans dat die nageslag horings het?

 

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