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Fertilisation Process Overview

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Questions and Answers

What is the main criterion used in dividing the human embryonic period into Carnegie stages?

Age in days

Embryonic length

Morphological features (correct)

Number of somites present

In the context of embryonic development, what do Carnegie stages primarily focus on?

Number of cell divisions undergone by the embryo

Exact age of the embryo

Morphological development of the embryo (correct)

Physical size of the embryo

What is the role of somites in determining Carnegie stages?

Gastrulation process

Age determination

Size of the embryo

Morphological development (correct)

Which of the following is NOT a factor considered when classifying human embryonic development into Carnegie stages?

Presence of neural tube Signup and view all the answers

What key aspect of embryonic development is directly tied to the division into Carnegie stages?

Morphological features Signup and view all the answers

What is the function of acrosin and neuaminidase during fertilisation?

Assist in passage through zona pellucida Signup and view all the answers

What is the purpose of the zona reaction during fertilisation?

Prevents polyspermy Signup and view all the answers

What happens to the tail of the sperm during fertilisation?

It degenerates Signup and view all the answers

What is the result of the fusion of female and male pronuclei during fertilisation?

Formation of zygote Signup and view all the answers

What is the primary function of trophoblast during early human embryonic development?

Embryonic part of the placenta Signup and view all the answers

What event marks the beginning of implantation in human embryonic development?

Disappearance of zona pellucida Signup and view all the answers

During which period of human development do all major organs form?

Embryonic period Signup and view all the answers

At what stage does the heart start pumping in a developing human embryo?

29 day embryo Signup and view all the answers

Which type of developmental abnormalities usually involve small DNA mutations affecting individual or a few genes?

Congenital abnormalities Signup and view all the answers

Which of the following is a major chromosomal abnormality characterized by an extra chromosome 21?

Trisomy 21 Signup and view all the answers

Which term refers to abnormalities derived from lifestyle, environment, and nutrition during pregnancy?

Maternal derived abnormalities Signup and view all the answers

At what stage in human development are all major organs already in place?

8 weeks old Signup and view all the answers