Question

Genetics Pedigree Worksheet 1. Use the below pedigree chart to answer the following questions about dimples. The Dimple gene controls whether a person has dimples or doesn't have dimples. Dimples is dominant to no dimples. Place the genotypes of each individual below its symbol. O Dimples gene (D) Dimples is dominant to no dimples 12 13 14 A) How many family members have Dimples? B) What is the genotype of individual 3 and 4? C) Can cither individual #8 or 9 be homozygous? C) Explain the family relationship that #12 has with # 2. 2. Use the below pedigree chart to answer the following three questions about unibrows. A person can either have two eyebrows or one fused eyebrow called a unibrow. The Eyebrow gene codes for which type of eyebrows a person will have. NOTE: this is a Recessive Trait- Which mean for a person to be affected they must have two recessive alleles. Place the genotypes of each individual below its symbol. male femal Eyebrow gene (E) 13 14 14 15 The eyebrow gene is a recessive trait. A person only has a unibrow if they have two recessive alleles 16

Answer 1

1) a dominant trait cannot skip generations, so the shaded squares are circles represents individuals without dimples.

( if the shaded individuals were the ones with dimples, then the parents of progenies with dominant trait show recessive phenotype, that is not possible example, parents of 12 and 14 do not have the dominant trait)

there are 10 individuals with dimples.

so the individuals with Dimples are 2,3,4,5,6,7,8,9,11,13

b) 3 and 4 are heterozygous so they have progenies with Dimples and progenies who does not have dimples

Dd * Dd

	D	d
D	DD ( dimples)	Dd( dimples)
d	Dd( dimples)	dd ( no dimples)

c) no, both of them are heterozygous, they have the dominant phenotype so they have the dominant allele, but they have progenies with recessive trait so both of them have to be heterozygous.

d) 2 is the maternal grandmother of 12 and 12 is the grandchild of 2.