In humans, black hair (B) is dominant over red hair (b) and having six fingers (F) is dominant over having five fingers (f). Sally has black hair and five fingers. Her father has red hair. Sally marries Bill who has red hair and six fingers. They have children. Bill's mother had five fingers.

Question

Biology

Guillermo Huang

13 December, 15:48

In humans, black hair (B) is dominant over red hair (b) and having six fingers (F) is dominant over having five fingers (f). Sally has black hair and five fingers. Her father has red hair. Sally marries Bill who has red hair and six fingers. They have children. Bill's mother had five fingers.

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Answers (1)

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Trystan Bean · Answer 1

Genotype & Phenotype

BbFf - 4

bbFf - 4

Bbff - 4

bbff - 4

Phenotype

BbFf - Black Hair with six fingers

bbFf - red hair with six fingers

Bbff - Black hair with five fingers

Bbff - red hair with five fingers

Explanation:

Given

Black hair allele is represented by "B"

Red hair allele is represented by "b"

Trait of having six fingers is represented by "F"

Trait of having five fingers is represented by "f"

Also, B is dominant over b and F is dominant over f

Genotype of sally having black hair and five fingers when her father has red hair is Bbff

Genotype fo Bill having red hair and six fingers when his mother had five fingers is bbFf

Bbff * bbFf

Bf bf Bf bf

bF BbFf bbFf BbFf bbFf

bf Bbff bbff Bbff bbff

bF BbFf bbFf BbFf bbFf

bf Bbff bbff Bbff bbff

Genotype & Phenotype

BbFf - 4

bbFf - 4

Bbff - 4

bbff - 4

Phenotype

BbFf - Black Hair with six fingers

bbFf - red hair with six fingers

Bbff - Black hair with five fingers

Bbff - red hair with five fingers