Answer for brainliest
2.
myosin is plentiful in muscle cells, but is not found at all in lens cells. lens cells contain large amounts of crystallins, which are not found in muscle cells. why do some proteins appear in one type of cell but not in another?

during differentiation, certain genes are added to cells to produce proteins that enable specific functions.

differentiated cells release unused proteins into the blood for other cells to use.

differentiated cells produce all proteins but destroy the proteins they do not use.

during differentiation, certain genes are activated to produce proteins that enable specific functions.
3.
which of the following statements best explains the role of meiosis in reproduction?

meiosis allows chromosomes to exchange genetic material through crossing over.

meiosis makes it possible for a zygote to have the correct number of chromosomes.

meiosis increases the chances of fertilization because it produces four daughter cells.

meiosis results in offspring with genotypes that are not exact copies of the parents.
4.
which statement is true of both mitosis and meiosis?

both occur only in reproductive cells.

dna replication occurs before the division of the nucleus.

both are involved in asexual reproduction.

the number of chromosomes is reduced by half.
5.
the diagram below represents structures found in a human female.
which process results in the formation of structure x?

meiosis

cloning

recombination

mitosis
6.
meiosis is a type of cell division in which germ cells divide to produce haploid cells. where does meiosis occur?

muscle cells

bone cells

ovary cells

brain cells
7.
the diagram below shows a process that affects chromosomes during meiosis.

this process can be used to explain

the origin of new combinations of traits in offspring

why some offspring physically resemble their parents

why some offspring are genetically identical to their parents

the process of differentiation in offspring
8.
why is approximately 50% of any individual’s dna inherited from that individual’s father?

half of the individual’s cells descend from the father’s gamete.

it was passed to the individual by a gamete from the father.

half of the individual’s nuclei descend from the nucleus of the father’s gamete.

it was passed to the individual by a somatic cell from the father.
9.
nondisjunction during meiosis results in an abnormal number of chromosomes in one or more gametes. in some cases of nondisjunction, a single chromosome fails to separate. in others, none of the chromosomes separate. suppose an egg is produced in which none of the chromosomes separate during meiosis ii. what is the chromosome number of the zygote that results if this egg is fertilized by a normal sperm?

2n + 1

1n

3n

2n
11.
which phrase best describes a process represented in the diagram below?

a zygote dividing by mitosis

a zygote dividing by meiosis

a gamete dividing by mitosis

a gamete dividing by meiosis