Question

Bio HW

#54

Following up on the last question: Once haploid gametes are produced through meiosis, how is the diploid number restored in animals?

	a.	fertilization.
	b.	synapsis.
	c.	DNA replication.
	d.	crossing over.
	e.	independent assortment.

Answer 1

haploid gametes are produced by meiosis, egg is produced in the mother and sperm is produced in the father, sperm fertilizes, egg cell to form zygote, zygote has haploid genome from father and haploid genome from mother so zygote is diploid, zygote undergoes mitosis to develop into offspring, so offspring is diploid.

diploid number restored in animals via fertilization.

a) fertilization

synapsis: homologous chromosomes pair up during prophase I of meiosis

DNA replication: double stranded DNA replicates to two double stranded DNA molecules.

Crossing over- paired homologus chromosomes exchange genetic material between non-sister chromatids

independent assortment- paired homolgous chromsoomes align at the metaphase plate such that any one of the chromosome can be separated and move to daughter cells.