Question

for one of the monohybrid crosses you performed in this investigation, describe how to use the phenotype

Non Mendelian Genetics Assignment 1a. Marfan syndrome is a dominant disorder. List the possible genotype(s) for those afflicted by this disorder. 1b. In the cross Mm x mm, what percentage of the children are expected to inherit the disorder? Explain your answer. 2a. One non disjunction event has occurred during the second meiotic division. Explain how many chromosomes are in the 2 gametes affected at the end of telophase II ? 2b. List three disorders caused by non disjunction: 3a. Labrador retrievers coat color is controlled by two genes. For the cross bbЕe x BbEe, list the gametes produced by each parent.

Answer 1

Ans.1

| (a) And Marfan Possible Dominant disorden genotypes = MM or Mm 116) Mm x mm m m M mm Diseased Mm. Diseased mm Normal m mm Normal 2 X 100 of of children inheriting the disorder 4 5000

Ans.2) a.Due to one nondisjunction in meiosis II, two gametes will be Affected. Out of two affected gametes, one gamete will extra copy of one chromosome while 2nd gamete will be lacking same chromosome.

say if ne = 3 1988 We Tued. m poweon Meiosis I XXX ⓇKY n. m Meissis I 888 18888 بما Itlo i 2-3 888 1-10

Ans.2b) Disorders caused by nondisjunction-

1. Down syndrome- Trisomy 21

2. Patau syndrome- Trisomy 13

3. Edwards syndrome- Trisomy 18

Ans.3)
БЬЕe. х ЗЬ Еe. 13 (@) ЬЕ be gametes Produced 31. БЬЕe gametes produced ІЗЬЕ О. ВЕ, Вс 3(5) 3 - Е- ьь E- (3 (асқ Chocolate ее. — بیہ F, 9 bь Ее X Bь Е b Бе. BE Bь Ее BOEE Black ВЬЕe. Зе Black Bbee yellow Вақ Two colors Black and yellow имett be produced

30) Percentage of Black color Progeny = 3 xloo 4 15.1 Percentage of yellow coler Progeny = 1 Xloo 4 = 25.4
Ans.4)

Anshel Genotype of color Blind male. X y types of color Blind female = xx Ans 4b Geno xx x x Anshal Xoy Genotype of color Blind male = Ans. 4 Genotype of color Blind female = Xexe Ans. 4 col This is because Red/ green color Blinetness sex-linked recessive disorder. So in in female disease will occur when Both X only chromosomes will carry recessive allele cc) But in male as X chromosome is present, even necessive allele is disease will оссчҮ onlayn it there,

Ans.) 4) Xºx X ху Х x Х XX Nomet gin хсу Cotor is und Boy XX Normal girl ху Normal y Boy olo of Color Blind of Boys with Boya X 100 Color Blindness Total Boya Xloo So د/• of girls with Coler Blind girls Xtoo color Blindness girls Xloo o /.