Answer:
B. Two different sperm both fertilizing the same egg
Explanation:
Two different sperm both fertilizing the same egg
<span>The answer is poly-abuse, due to his addiction to many different forms of drugs. This is a very dangerous form of drug addiction because of the mixing of the chemicals inside the body can give adverse effects when combined.</span>
1) Data:
dominant allele- A
recessive allele- a
Heterozygotic: Aa (only carries the allele)
Homozygotic recessive: aa (expresses the disease)
Homozygotic dominant: AA (doesn't carry or expresses the disease)
2)The first cross between Jim and his first wife originated a offspring with
<span>cystic fibrosis</span>. That offspring has the genotype aa and for that to happen both parents need to be a least carriers or express the disease. The exercise rules out the second case, which makes Jim a carrier.
3)Now between Jim and Martha:
From the previous step, we already found that jim is a carrier and the exercise also tells us that Martha is one too. So, their genotype is: Aa.
The cross: Aa x Aa
The probability:
1/4 aa = 25%
2/4 =Aa
1/4 - AA
the probability of having a <span>baby with cystic fibrosis is 25%</span>
I believe it is C, there are four nitrogenous bases involved. Adenine, cytosine, guanine, and thymine
