A feature of a pedigree that indicate that a certain trait is a dominant trait is that one of the parents always have to have the trait.
There are, however, autosomal dominance and X-linked dominance.
For an autosomal dominant trait:
- Appears equally frequent in both sexes.
- Both sexes transmit the trait.
- Present in all generations.
- When one parent has the trait and the other doesn't, approximately half of the offspring will present the trait.
For a X-linked dominant trait:
- Both male and females can present the trait, but more females usually present it.
- Sons with the trait always have a mother that presents the trait as well.
- Daughters with the trait always have either a mother or father that presents the trait, or both.
- Fathers with the trait always have daughters with the same trait.
No the driver's kids will not be affected by the accident of the man losing his leg. Now if the man was born without a leg than maybe but again you can not be sure because deformity can be caused by many things like drugs or it can be hereditary. The hereditary would be like having twins. Like your grandfather could of been a twin or could have been born without a leg and than your dad wouldn't be a twin or he would have both of his legs. Then when your dad had you you could be a twin or you could be missing a leg. Do you see where I'm going with this? And also it could just be a coincident that he was born without a leg or that he was a twin.
"Lactose intolerance" means that your stomach has an extremely hard time digesting lactose, found in dairy products such as milk. For the second part of the question, can you tell me if you mean adapting to resist against lactose or the development of lactose from a long time ago.
Answer:
Option A, option B. Option A and B are specific to retroviruses, although option c and d are also true, they are not specific only to retroviruses.
Explanation:
Retrovirus is a type of virus that uses RNA as its genetic material. After infecting a cell, a retrovirus uses an enzyme called reverse transcriptase to convert its RNA into DNA. The retrovirus then integrates its viral DNA into the DNA of the host cell, which allows the retrovirus to replicate.
The nucleotide sequence of the DNA is GACT or RNA, which is the molecule. Hope this helps :)