2. Ptos is is an inherited eyelid abnormality. An affected individual\'s eyelids

Question

2. Ptos is is an inherited eyelid abnormality. An affected individual's eyelids droop, preventing the eyes from opening completely. A single gene controls this abnormality and has two possible alleles - the ptosis eyelid trait is the dominant allele and the normal eyelid trait is recessive An affected woman (she shows the ptosis phenotype affected. Her father's mother has normal eyelids. )has a mother with normal eyelids and a father that is Choose symbols to represent the normal eyelid allele and the ptosis eyelid allele. Use these symbols to write a. the genotypes of The affected woman The affected woman's mother The affected woman's father The affected woman has children with a man that has normal eyelids. Set up and fill in a Punnett squa b. this cross. c. What is the probability that a child from this cross will have ptosis?

Explanation / Answer

Answer:

2). a).

Affected allele = E

Normal allele = e

The affected woman's genotype = Ee (affected)

The affected woman's mother's genotype = ee (normal)

The affected woman's father's genotype = Ee (affected)

b).

Ee (affected woman) x ee (normal eyelids)--------Parents

c). The probability that a child from this cross will have ptosis is 50%

e E Ee (affected) e ee (normal)

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