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Question 5
This question is about inheritance. Humans have 23 pairs of chromosomes in each body cell. One pair of chromosomes determines sex. Complete Figure 5. In some fami... show full transcript
Step 1
Answer
The completed Punnett square would show the male gametes (X and Y) on one side and the female gametes (X and X) on the other:
Female
| X | X |
---------------------
X | XX | XX |
---------------------
Y | XY | XY |
This illustrates the possible offspring combinations.
Step 2
Answer
The reason could be that there is a 50% chance for each child to inherit an X or Y chromosome from the male parent. If the sperm that fertilizes the egg consistently carries the same type of chromosome (either X or Y), all offspring will be of the same sex.
Step 3
Answer
Both parents must be shown as heterozygous (Tt):
Woman
| T | t |
---------------------
T | TT | Tt |
---------------------
t | Tt | tt |
The phenotype probabilities are: 1 TT (normal), 2 Tt (carriers, no CF), and 1 tt (with CF).
The probability of having a child with CF is therefore ( \frac{1}{4} ) or 25%.
Additionally, the genotype of any child with CF is tt.
Step 4
Answer
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