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2. In watermelons, the allele for green fruit is autosomal dominant (G) over the striped fruit (gg). The allele for short fruit (B) is dominant over the allele for long fruit (bb). A green short watermelon plant that is heterozygous for both traits is crossed with a striped long watermelon plant. Punnett Square: Green, short genotype: Striped, long genotype: Green, short gamete alleles: Striped, long gamete alleles: What are the chances for their offspring to be striped and short? III. X-linked Crosses 1. Scaly, rough skin, or ichthyosis, is an X-linked recessive trait found in humans (X$^i$); normal skin is dominant (X$^N$). Mike has ichthyosis and he marries Carol who has normal skin. They have three boys and two girls. Their one daughter has ichthyosis and the other daughter does not. The eldest son has ichthyosis and the other sons have normal skin. Mike's genotype Carol's genotype Punnett square: Mike's gamete alleles Carol's gamete alleles What are the chances that they have a daughter with ichthyosis? What are the chances that they have a son with ichthyosis?

          2. In watermelons, the allele for green fruit is autosomal dominant (G) over the striped fruit (gg). The
allele for short fruit (B) is dominant over the allele for long fruit (bb). A green short watermelon
plant that is heterozygous for both traits is crossed with a striped long watermelon plant.
Punnett Square:
Green, short genotype:
Striped, long genotype:
Green, short gamete alleles:
Striped, long gamete alleles:
What are the chances for their offspring to be striped and short?
III. X-linked Crosses
1. Scaly, rough skin, or ichthyosis, is an X-linked recessive trait found in humans (X$^i$); normal skin is
dominant (X$^N$). Mike has ichthyosis and he marries Carol who has normal skin. They have three
boys and two girls. Their one daughter has ichthyosis and the other daughter does not. The
eldest son has ichthyosis and the other sons have normal skin.
Mike's genotype
Carol's genotype
Punnett square:
Mike's gamete alleles
Carol's gamete alleles
What are the chances that they have a daughter with ichthyosis?
What are the chances that they have a son with ichthyosis?

2. In watermelons, the allele for green fruit is autosomal dominant (G) over the striped fruit (gg). The
allele for short fruit (B) is dominant over the allele for long fruit (bb). A green short watermelon
plant that is heterozygous for both traits is crossed with a striped long watermelon plant.
Punnett Square:
Green, short genotype:
Striped, long genotype:
Green, short gamete alleles:
Striped, long gamete alleles:
What are the chances for their offspring to be striped and short?
III. X-linked Crosses
1. Scaly, rough skin, or ichthyosis, is an X-linked recessive trait found in humans (X^i); normal skin is
dominant (X^N). Mike has ichthyosis and he marries Carol who has normal skin. They have three
boys and two girls. Their one daughter has ichthyosis and the other daughter does not. The
eldest son has ichthyosis and the other sons have normal skin.
Mike's genotype
Carol's genotype
Punnett square:
Mike's gamete alleles
Carol's gamete alleles
What are the chances that they have a daughter with ichthyosis?
What are the chances that they have a son with ichthyosis?

Added by Leslie T.

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