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23 June, 00:06

09) Na mandioca existem dois pares de genes situados em dois pares de cromossomos diferentes, que atuam respectivamente sobre a cor da raiz e a largura dos folíolos. As relações de dominância para os fenótipos e genótipos são as que se seguem:

Faça o cruzamento entre os indivíduos indicados e verifique a descendência:

a) Marron (homozigoto) Estreito (heterozigoto) x Branco e estreito (heterozigoto)

b) Marron (homozigoto) largo x branco e largo

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  1. 23 June, 01:59
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    [Incomplete question. I found these data in other source]

    Brown: BB and Bb

    White: bb

    Narrow: LL and Ll

    Long: ll

    Answer:

    This means that long is recessive and narrow is dominant, and also brown is dominant and white is recessive.

    root color - > Alleles: narrow (L) and long (l)

    leaflets length - > Alleles: brown (B) and white (b)

    a) A brown (homozygous) narrow (heterozygous) mandioca is BBLl, so it can produce BL or Bl gametes

    A white mandioca is always homocygous, so a white narrow (heterozygous) mandioca is bbLl - this means it can produce bL and bl gametes.

    So here is the Punnett square:

    ---| - - BL-|--Bl--

    bL|BbLL| BbLl

    -bl|BbLl-| Bbll

    So 75% of the offspring will be brown and narrow and 25% will be brown and long.

    b) A long mandioca is always homocygous, so a brown (homocygous) long mandioca is BBll - this means it can only produce Bl gametes. As white has to be homobygous as well, a white long mandioca has to be bbll - this means it can only produce bl gametes. So here is the Punnett square:

    ---| - Bl

    bl-|Bb ll

    So all the offspring is going to be brown and long.
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