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Ch. 29 Development and Inheritance
Martini - Fundamentals of Anatomy & Physiology 11th Edition
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMartini, Nath, Bartholomew 11th EditionCh. 29 Development and InheritanceProblema 6
Capitolo 28, Problema 6

The pre-embryo develops into a multicellular complex known as a 
(a) Blastocyst
(b) Trophoblast
(c) Lacuna
(d) Blastomere

Guida verificata passo dopo passo
1
Step 1: Understand the terminology related to early embryonic development. The pre-embryo is the stage after fertilization when the zygote begins to divide but has not yet implanted in the uterus.
Step 2: Recognize that the pre-embryo undergoes cleavage, a series of mitotic divisions, resulting in smaller cells called blastomeres.
Step 3: As cleavage continues, the cells form a hollow ball of cells known as the blastocyst, which is the structure that implants into the uterine wall.
Step 4: Identify the components of the blastocyst: the outer layer called the trophoblast, which will contribute to the placenta, and the inner cell mass, which will develop into the embryo.
Step 5: Conclude that the pre-embryo develops into a blastocyst, making option (a) the correct answer.

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Pre-embryo Development

The pre-embryo is the early stage of embryonic development following fertilization, characterized by rapid cell division without growth. It progresses through stages such as the morula and blastocyst before implantation in the uterus.
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Introduction to Human Development

Blastocyst Structure and Function

A blastocyst is a hollow, fluid-filled structure formed about five days after fertilization. It consists of an outer layer called the trophoblast and an inner cell mass, which will develop into the embryo proper.
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Blastocyst Formation: Days 4-5

Trophoblast Role

The trophoblast is the outer cell layer of the blastocyst that facilitates implantation into the uterine wall and later forms part of the placenta, supporting nutrient exchange between mother and embryo.
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Blastocyst Formation: Days 4-5
Pratica correlata
Domanda del libro di testo

The structure(s) that allow(s) active and passive exchange between the fetal and maternal bloodstreams is/are the 

(a) Yolk stalk

(b) Chorionic villi

(c) Umbilical veins

(d) Umbilical arteries

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Domanda del libro di testo

Identify the two extra-embryonic membranes and the three different regions of the endometrium at week 10 of development in the following diagram.

a. ___

b. ___

c. ___

d. ___

e. ___

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Domanda del libro di testo

Recessive X-linked traits 

(a) Are passed from fathers to their sons

(b) Are more likely to be expressed in males

(c) Always affect some aspect of the reproductive system

(d) Are never expressed in females

(e) Cannot be passed from mothers to daughters

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Domanda del libro di testo

The stage of development that follows cleavage is the

(a) Blastocyst

(b) Morula

(c) Trophoblast

(d) Blastocoele

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Domanda del libro di testo

What are the four extra-embryonic membranes?

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Domanda del libro di testo

If an allele must be present on both the maternal and paternal chromosomes to affect the phenotype, the allele is said to be 

(a) Dominant

(b) Recessive

(c) Complementary

(d) Heterozygous

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