1)Mary\'s father does NOT have freackles, but Mary does. What genotype could Mar
ID: 175452 • Letter: 1
Question
1)Mary's father does NOT have freackles, but Mary does. What genotype could Mary's mother have?2) what are the chances two individuals with autosomal recessive trait will have a child with this trait?
3) show a cross that would produce a phenotypic ratio 1:1 amoung the offspring
4) if the parents are heterozygous for cystic fibrosis what are the chances of a child having cystic fibrosis?
5) john has blood type AB show all possible gentotypes for this blood
6) Mary has blood type A and Mateo has blood type. Can they be the parents of a child with type O blood? Why or why not?
1)Mary's father does NOT have freackles, but Mary does. What genotype could Mary's mother have?
2) what are the chances two individuals with autosomal recessive trait will have a child with this trait?
3) show a cross that would produce a phenotypic ratio 1:1 amoung the offspring
4) if the parents are heterozygous for cystic fibrosis what are the chances of a child having cystic fibrosis?
5) john has blood type AB show all possible gentotypes for this blood
6) Mary has blood type A and Mateo has blood type. Can they be the parents of a child with type O blood? Why or why not?
2) what are the chances two individuals with autosomal recessive trait will have a child with this trait?
3) show a cross that would produce a phenotypic ratio 1:1 amoung the offspring
4) if the parents are heterozygous for cystic fibrosis what are the chances of a child having cystic fibrosis?
5) john has blood type AB show all possible gentotypes for this blood
6) Mary has blood type A and Mateo has blood type. Can they be the parents of a child with type O blood? Why or why not?
2) what are the chances two individuals with autosomal recessive trait will have a child with this trait?
3) show a cross that would produce a phenotypic ratio 1:1 amoung the offspring
4) if the parents are heterozygous for cystic fibrosis what are the chances of a child having cystic fibrosis?
5) john has blood type AB show all possible gentotypes for this blood
6) Mary has blood type A and Mateo has blood type. Can they be the parents of a child with type O blood? Why or why not?
Explanation / Answer
1)Freckles is dominant trait.
F - freckles , f -no freckles
Mary's father is ff
So mary is Ff. Her mother can be FF or Ff.
2) Let a be recessive trait.
Aa X Aa
A a
A AA Aa
a Aa aa recessive trait is 1/4. Or 25% chances.
3) Mendelian test cross
R is dominant. r is recessive.
Rr X rr
R r
r Rr rr
r Rr rr ratio is 2:2 or 1:1.
4) cystic fibrosis is autosomal recessive.
Parents are heterozygous Cc X Cc
C c
C CC Cc
c Cc cc there are 25% chances that the child may have cystic fibrosis.
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