CAIE IGCSE Biology 16.4.7 Zygote, Embryo & Implantation

Practise explaining how mitotic divisions form an embryo that implants into the lining of the uterus.

Exam points

state that fertilisation produces a diploid zygote
explain that repeated mitosis forms a ball of genetically identical cells
locate implantation in the lining of the uterus after the embryo reaches it

[Maximum number: 3]

Pregnancy can occur after the fusion of a male gamete and a female gamete.

(a)

State the name of the ball of cells that implants into the uterus after fertilisation.

[ 1 ]

(b)

There are many changes that occur in a fetus during pregnancy.

Compare the development of a fetus in the early stages of pregnancy to its development in the late stages of pregnancy.

[ 2 ]

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16.4.7—In early development, the zygote forms question 1

Question (a)

Question (b)