Answer:
the answers are a&d sorry if #1 isnt correct
Explanation:
Answer:
A gene codes for a particular protein that is involved in the expression of a trait.
Explanation:
Characteristics determined by single genes are called Mendelian traits.
Answer:
This is because of how reproduction works in humans. Male and female sex cells are formed by a process called meiosis, where the diploid chromosomes divide and separate. And so the ratio of male to female births is also 50:50.
