During zygotene stage of meiosis I, a remarkable pairing of chromosomes occurs. Look at the bottom part of As shown in which “mitosis: growth of the body” has produced cells with four different types of chromosomes. The black ones came from the sperm nucleus. The red ones came from the egg nucleus. If one of these nuclei were to undergo meiosis, which chromosomeswould pair during zygotene (which are homologous)— the long black one with the short black one or the long black one with the long red one? SpermnucleusEggnucleusFertilizationZygoteS phaseMitosis:growth of bodyFIGURE 4-19 Sperm cells and egg cells are haploid, each having just one set ofchromosomes; in this case, the set contains a long chromosome and a short one. Afterfertilization, the zygote is diploid with two complete sets: two long chromosomesand two short ones. The zygote grows into a mature plant by mitosis, so all nuclei areduplicates of the original zygote nucleus. Each is diploid, with one set each of paternaland maternal chromosomes.

Meiosis is a reduction division that reduces the number of chromosomes in the daughter cells.

Answered: Sperm nucleus Egg nucleus Fertilization…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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During zygotene stage of meiosis I, a remarkable pairing of chromosomes occurs. Look at the bottom part of As shown in which “mitosis: growth of the body” has produced cells with four different types of chromosomes. The black ones came from the sperm nucleus. The red ones came from the egg nucleus. If one of these nuclei were to undergo meiosis, which chromosomes
would pair during zygotene (which are homologous)— the long black one with the short black one or the long black one with the long red one?

Sperm
nucleus
Egg
nucleus
Fertilization
Zygote
S phase
Mitosis:
growth of body
FIGURE 4-19 Sperm cells and egg cells are haploid, each having just one set of
chromosomes; in this case, the set contains a long chromosome and a short one. After
fertilization, the zygote is diploid with two complete sets: two long chromosomes
and two short ones. The zygote grows into a mature plant by mitosis, so all nuclei are
duplicates of the original zygote nucleus. Each is diploid, with one set each of paternal
and maternal chromosomes.

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