Question

biology 1 eoc assessment sample questions

1. one of the accepted scientific theories describing the origin of life on earth is known as chemical evolution. according to this theory, which of the following events would need to occur first for life to evolve?

a onset of photosynthesis
b origin of genetic material
c synthesis of organic molecules
d formation of the plasma membrane

1. hemophilia is a sex - linked, recessive trait. which of the following describes the probability of hemophilia in the offspring of a man who does not have hemophilia and a woman who is a heterozygous carrier?

a there is a 100% chance that their sons will have hemophilia.
b there is a 0% chance that their daughters will have hemophilia.
c there is a 25% chance that their sons will have hemophilia.
d there is a 50% chance that their daughters will have hemophilia.

Explanation:

Step1: Analyze question 4

Chemical evolution theory posits that life originated from non - living matter. Organic molecules must be synthesized first to form more complex structures for life. Photosynthesis, origin of genetic material, and plasma membrane formation are later steps.

Step2: Analyze question 5

Let \(X^H\) represent the normal allele and \(X^h\) represent the hemophilia - related allele. The man's genotype is \(X^HY\) and the woman's is \(X^HX^h\). For sons, the possible genotypes are \(X^HY\) and \(X^hY\) with a 50% chance of getting \(X^hY\) (hemophilia). For daughters, possible genotypes are \(X^HX^H\) and \(X^HX^h\), so 0% chance of having hemophilia.

Answer:

1. C. synthesis of organic molecules
2. B. There is a 0% chance that their daughters will have hemophilia.