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Biology

2 answers:

Dima020 [189]3 years ago

6 0

What is the probability of having red-green color blindness for the cross that is represented by the Punnett square?

0 percent

25 percent

50 percent

75 percent

Answer B or 25%

just took the test good luck on your test

inysia [295]3 years ago

3 0

Answer:

The correct answer would be b) 25 percent.

In females, X-linked recessive disorder is expressed only when the mutated gene is present in both the X chromosomes whereas in males presence of only one copy of mutated gene is sufficient to cause the disease as they have only one X chromosome.

Now the given cross will results in the production of:

Two daughters- one is homozygous dominant ( $X^{B}X^{B}$ ) and other is heterozygous dominant $X^{B}X^{b}$
Two sons- one carries dominant gene ( $X^{B}Y$ ) and other carries recessive or mutated gene ( $X^{b}Y$ ).

From the test, it is clear that only one son out of 4 offspring carries the disease.

Hence, the probability will come out to be 1/4 = 0.25 or 25 percent.

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kmf Of the 40 specimens of bacteria in a dish,3 specimens have a certain trait. If 5 specimens are to be selected from the dish

almond37 [142]

Answer:

$\frac{C^{3}_1* C^{47}_4}{C^{40}_5}$

Explanation:

It is given that out of 40, total 5 specimen are selected.

Thus, the number of ways in which 5 specimens are selected from a given sample of 40 is given by

$C^{40}_{5}\\$

Number of specimen with certain trait is equal to 3.

Now, total 5 specimen are selected out of which one specimen is selected from the set of specimen that has certain trait (i.e out of 3) while the remaining four specimen will be selected from the rest $40-3=37$ specimen.