In human beings, Widow\'s Peak are dominant to straight hairlines. Suppose a str
ID: 3150 • Letter: I
Question
In human beings, Widow's Peak are dominant to straight hairlines. Suppose a straight hair lined man whose parents had Widow'speak marries a Widow's peaked woman whose father had a straighthair line. a) what percentage of their children would you predict willhave straight hair lines? b) what is the possible genotypes of the woman's mother? c) what are the genotypes of the man's mother andfather? 2. The trait for puple hair (P) is dominant over that for greenhair (G), w hich in turn is dominant over that for orange hair (O)P>G>o. The trait is X linked. Avigdor, a male, who has greenhair, marries Clarinda, who has purple hair, not knowing thatClarinda's mother's hair was a bright shade of orange.a) what can be predicted about the hair color of their malechildren?
b) what can be predicted about the hair color of their femalechildren? In human beings, Widow's Peak are dominant to straight hairlines. Suppose a straight hair lined man whose parents had Widow'speak marries a Widow's peaked woman whose father had a straighthair line. a) what percentage of their children would you predict willhave straight hair lines? b) what is the possible genotypes of the woman's mother? c) what are the genotypes of the man's mother andfather? 2. The trait for puple hair (P) is dominant over that for greenhair (G), w hich in turn is dominant over that for orange hair (O)P>G>o. The trait is X linked. Avigdor, a male, who has greenhair, marries Clarinda, who has purple hair, not knowing thatClarinda's mother's hair was a bright shade of orange.
a) what can be predicted about the hair color of their malechildren?
b) what can be predicted about the hair color of their femalechildren?
Explanation / Answer
Let's call the dominant widows peak allele, W and the recessivestraight haired allele , w. a) The man has a reccesive phenotype and thus must have thehomozygous recessive genotype, ww. The woman has a widows peak (dominant phenotype)which means she has at least one W allele. Her father howeverhad the recessive phenotype and thus had the recesive genotype, ww.Thus the woman also has at least one w allele. Therefore the woman has a Ww genotype. Now do a cross | w w W| Ww Ww w | ww ww This chart represents the possible genotypes of the children. Halfof the genotypes are ww so half of the children will have straighthair lines b) The woman inherited a W allele from her mother and thus hermother has at least one W allele, but possibly two Thus the woman'smother's possible genotypes are WW and Ww. c)The man has genotype ww and thus inherited a w from both of hisparents. So each parent has a w. We also know that eachparent had the dominant widows peak phenotype so they must each ofa W as well. Therefore the genotypes of the parents are bothWw. 2. a) Avigdor's genotype is GY. Clarinda'sgenotype is PO. | G Y P | PG PY O | OG OY The cross above shows that the half the males will have purple hairand half will have orange hair b) The cross from a shows that half the females will have have greenhair and half will have purple hair.