Pedigree Practice



Pedigree Practice

What is the pattern of inheritance depicted? AUTOSOMAL DOMINANT

Write the genotypes for all individuals --use "A" to represent a dominant allele & "a" to represent a recessive allele, if one allele is unknown, use a "?" to represent that allele.

Generation #1 - Aa, aa

Generation #2 - Aa, Aa, aa, A?, aa, Aa, aa, Aa

Generation #3 - aa, Aa, aa, aa, aa, Aa

NOT X-linked because a female who has the trait has a son who does not (not possible with x-linked).

Not Autosomal recessive - two parents who express the trait have a child who does not express it. (Not possible with autosomal recessive, since parents would only have recessive alleles to pass on).

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Pedigree Practice

Answer the questions about the pedigree chart below.

What is the pattern of inheritance depicted? __________________________

WHY are the other patterns ruled out?

Write the genotypes for all individuals --use "A" to represent a dominant allele & "a" to represent a recessive allele, if one allele is unknown, use a "?" to represent that allele.

Generation #1 -

Generation #2 -

Generation #3 -

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Pedigree Practice #1

In the pedigree chart below, the filled symbols represent individuals who express a given trait - circles are females, squares are males. If each line represents one generation -

What is the pattern of inheritance depicted? ________________

Why isn't it the other two patterns of inheritance?

Write the genotypes for all individuals --use "A" to represent a dominant allele & "a" to represent a recessive allele, if one allele is unknown, use a "?" to represent that allele.

Generation #1 –

Generation #2 –

Generation #3 -

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Pedigree Practice #1 - ANSWERS

In the pedigree chart below, the filled symbols represent individuals who express a given trait - circles are females, squares are males. If each line represents one generation -

What is the pattern of inheritance depicted? AUTOSOMAL RECESSIVE

Write the genotypes for all individuals --use "A" to represent a dominant allele & "a" to represent a recessive allele, if one allele is unknown, use a "?" to represent that allele.

Generation #1 --aa, Aa

Generation #2 -- aa, Aa, Aa, aa, Aa, Aa, Aa, aa

Generation #3 --Aa, aa, aa, Aa, Aa, aa

NOT X-linked because a female who has the trait has a son who does not (not possible with x-linked).

Not Autosomal dominant - two parents who do not express the trait have a child who does (not possible with autosomal dominant, since parents would only have recessive allele).

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