Punnett square

Cystic Fibrosis is an autosomal recessive disorder. A couple are both carriers of the recessive allele (both heterozygous (Cc)) and have the normal wild-type phenotype. What is the probability of the following occurring; If they have two children, what is the probability of them both being unaffected (CC or Cc) by the disease?

Why is this answer 3/8. Why do you add 1/8 three times? How would this question be worded for the answer to be 1/8?

The alleles for Blood type O can be represented by: "00". (Two capital Os) Which of the following is the correct way to describe this genotype? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. Homozygous dominant a b Homozygous recessive Heterozygous dominant d Heterozygous recessive

A couple is going to have a baby. They are concerned about sickle cell anemia, which results from having the homozygous recessive combination of the sickle cell gene ("s"), which produces abnormal hemoglobin. Having at least one normal version of the gene ("S") results in normal hemoglobin. The woman is heterozygous, and so is the man. What alleles does mom have? What alleles does dad have?

The gene for black hair (B) is dominant over the recessive gene for blond hair (b). If the father is heterozygous for black hair (Bb) and the mother has blond hair (bb), what is the likelihood that their child will have blond hair?   Question options:   50%   100%   25%   75%

Red-green colour blindness is a sex-linked trait. Red-green colour blindness (Xrg) is the inability to distinguish between red and green colours. The Xrg allele is recessive to the normal X-linked allele. A normal woman has a father who has red-green colour blindness. She had a child with a man who does not have red-green colour blindness. What is the probability they will have a son with red-green colour blindness? Select one: a. 0 b. 0.13 c. 0.25 d. 0.50

This time Miley has a child with Dawson (it is a big scandal). Neither Miley nor Dawson has Wilson's disease. What is the probability that their child will be homozygous for the dominant allele at the ATP7B locus?     1   1/2   1/4   1/16   2/3   3/4   1/9   1/8   4/9   1/6   1/3

Riann and Raul are soon-to-be biological parents who are both brown-haired, which reflects a dominant trait. One carries a recessive gene for red hair, while the other does not. What are the chances of Riann and Raul having a red- haired child? If the recessive gene and the dominant gene are paired, the child will have red hair. O In this case, the child will not have red hair in any combination. If Riann, the mother, passes on the recessive gene, the child will have red hair. If Raul, the father, passes on the recessive gene, the child will have red hair.

Parents Genotype : Bb/bb – Eye Color - (brown eyes dominant , blue eyes recessive) Dd- Dimples ( dominant) Cc/cc- Cleft chin (Dominant) Sarah BbDdcc James bbDdCc   What is the probability that Sarah and James will have a baby girl with blue eyes and dimples