For school, If both parents are carriers of an Autosomal recessive gene?

Question

( Tay-Sachs, sickle cell or CF)Then what are the chances that their child will be born normal, is a carrier, or is affected by the disorder?

Thanks

Answer 1

____A____a

A__AA___Aa

a___Aa___aa

Where A is the dominant (not sick), a is the recessive (sick)

so you have a 1/4 chance unaffected/not a carrier

2/4 chance carrier/no apparent symptoms

1/4 chance affected

Answer 2

If both people are carriers then the chances of ANY of their children getting the disease is 25% affected, 50% carriers and 25% unaffected.

-------C------c ( parent 1)

C---CC----Cc

c---Cc-----cc

This is like flipping a coin...where EVERY time you flip the coin the chance of getting a head is ALWAYS 50% and its the same for every child born, there is a 25% it will be affected ( you could have 5 children and ALL have it, its just the way).......so anymore children your cousin's has will always have a 25% chance of being affected ( and 75% of not being affected)

Answer 3

Two people with recessive genes means ALL the children will have that disease. 100%.

Answer 4

If the parents are both carriers,  that means they have one normal and one affected allele for the gene. The gene can be represented as Rr. R is the dominant allele , r is the recessive allele.

Combining Rr with Rr will yield

    ...........R ..... r

     R...... RR.....Rr

      r ...... Rr....  rr

1 child will be normal (RR) 25%

2 will be carriers (Rr), but normal 50%

1 will be affected (rr) 25%

Answer 5

pretty sure its 50 percent

Answer 6

if both parents are autosomal recessive (ss, ss) then the child will be 100% autosomal recessive (ss)

if there is someone in your family with the disease, BOTH parents are at least carriers. You have to do a Punnett square to figure it out.

If both parents are just carriers (Ss, Ss) then the chances are 25% SS (not a carrier - normal), 50% Ss (carrier - normal), and 25% ss (affected - has the trait.)