Question

Which of the following occurs in meiosis but not in mitosis?

Select one:

Chromosome replication

Formation of Chiasmata

Production of daughter cells

Attachment of chromosomes to the kinetochore microtubule

Alignment of chromosomes at the equator

5.

X (sex)-linked inheritance for conditions like hemophilia is unique because:

Select one:

there are multiple alleles involved

the Y chromosome has few genes

the female parent always carries the dominant allele

both parents are always carriers

the alleles for the disorder are quantitative

6.

In a diploid organism which is the true statement?

Select one:

mitosis is used to make new cells genetically identical, while meiosis is used for asexual reproduction

both mitosis and meiosis mixed up the genetic material and are used in asexual reproduction

both mitosis and meiosis mixed up the genetic material and are used in sexual reproduction

mitosis is used to make genetically different cells, while meiosis is used for making genetically identical cells

mitosis is used to make new cells genetically identical, while meiosis is used for sexual reproduction

Answer 1

1. The event occurs in meiosis and not in mitosis is -

B. Formation of chiasma - correct

(In the prophase-I stage of the meiotic cell division, homologous chromosomes exchange their chromatin material known as crossing over. formation of chiasma is the contact between two homologous chromosomes before the crossing over)

The rest of the options- Chromosome replication, Production of daughter cells, attachment of chromosomes to the kinetochore-microtubule, alignment of chromosomes at the equator are common to both mitosis and meiosis.

2. X (sex)-linked inheritance for conditions like hemophilia is unique because-

A. There are multiple alleles involved- incorrect

This is an X-linked recessive disorder and no involvement of multiple alleles. There is only one dominant allele and one recessive.

B. the Y chromosome has few genes- incorrect

The Y chromosome is normal in the male having hemophilia. The disorder is x linked and therefore not associated with Y chromosome abnormalities.

C. The female parent always carries the dominant allele- correct

In females, there are two X chromosomes. In the carrier female, one of the X chromosomes carries a dominant allele and another recessive. The hemophilia disorder in the female is extremely rare because every time they carry a dominant allele.

D. both parents are always carriers- an incorrect

male can not be a carrier because they have only one X chromosome. so the are either diseased or normal but never carrier.

E. the alleles for the disorder are quantitative- incorrect

A quantitative trait has various degrees of the phenotype that depends on the action of polygenic and the environment. Hemophilia does not follow this characteristic.

3. In a diploid organism, the true statement is-

A. mitosis is used to make new cells genetically identical, while meiosis is used for asexual reproduction- incorrect

Meiosis is the cell division that produces gametes and they participate in sexual reproduction.

B. both mitosis and meiosis mixed up the genetic material and are used in asexual reproduction- incorrect

Mitosis produces genetically identical cells and never mixed up the genetic material as crossing over process is absent.

C. both mitosis and meiosis mixed up the genetic material and are used in sexual reproduction- incorrect

As stated before Mitosis produces genetically identical cells and never mixed up the genetic material as crossing over process is absent.

D. mitosis is used to make genetically different cells, while meiosis is used for making genetically identical cells.- incorrect

As crossing over is absent, mitosis can not produce genetically different cells.

E. Mitosis is used to make new cells genetically identical, while meiosis is used for sexual reproduction- correct

Mitosis makes the new cell that replaces old somatic cells in the body. All of the cells produced by mitotic division are genetically identical. Meiosis involves crossing over (reciprocal exchange of genes between two homologous chromosomes) so they produce genetically different cells called gametes. gametes participate in sexual reproduction by ferlization.