bio 3 problems homework-Cattle coat color is determined

    1. Cattle coat color is determined by
    codominant alleles R and r. RR results in a reddish cow, Rr in a roan coloured
    cow, and rr in a white coloured cow. A population of 4000 cattle consisted of
    2560 reds, 1280 roans and 160 white cattle. Calculate the gene frequency of the
    ‘R’ gene and the ‘r’ gene. If you fill in the Table below you’ll have your
    answer:

    Phenotype

    Number of cattle

    Number of genes

    Gene Frequency

    R

    r

    R

    r

    Red

    2560

    0

    0

    Roan

    1280

    White

    160

    0

    0

    Total

    4000

    Hence
    the overall gene frequency (f(p)) of the red gene =
    Hence
    the overall gene frequency (f(q)) of the white gene =
    You
    can also solve this question using the Hardy Weinberg formula
    2. PKU
    (phenylketonuria) occurs in about 1 out of 12,000 Caucasians. It is rarer in
    other ethnic groups. Calculate the frequency of the recessive disease causing
    gene. Calculate the frequency of the normal gene. Complete the following table:

    Human Phenotypes

    Number in a population of 12000

    Human Genotypes

    Number in a population of 12000

    Normal

    15624

    Normal

    Carrier

    Showing PKU

    1

    Showing PKU

    1

    Hint: Here you must
    start the answer by calculating the frequency of the homozygous recessive gene
    q and you know that homozygous individuals occur in the population once every
    12,000 individuals. Hence q2= 1 in
    15625.

    3.10% of human males in a sampled population were found to be
    red/green colorblind. This is a recessive sex-linked condition. What proportion
    of human females are expected to be colorblind in this population. Hint: You
    might find it easier to answer this question if you referred to the table
    below, whereXb is the recessive X-linked colour-blind
    allele and XB is the dominant normal gene.

    Sex

    Category

    Homozygous
    Dominant

    Heterozygous
    Dominant

    Homozygous
    Recessive

    FEMALES

    Genotype

    XB XB

    XB Xb

    Xb Xb

    Phenotype

    normal

    normal

    colour-blind

    Gamete
    Types

    XB

    XB and Xb

    Xb

    MALES

    Genotype

    XB Y

    DOES

    Xb Y

    Phenotype
    (Percentage)

    normal
    (Then you can fill this in)

    NOT

    colour-blind
    (First you must fill this in)

    Gamete
    Types

    XB and Y

    EXIST

    Xb and Y

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