There are five key developmental stages in the life cycle and reproduction of sheep. These stages are listed below in alphabetical order:
embryo, fetus, gametes, lamb, zygote
List these five stages in the correct chronological order in which they occur, starting with the earliest stage.
The sex chromosomes in the cells of a biological ewe (female sheep) are XX\text{XX}XX. The sex chromosomes in the cells of a biological ram (male sheep) are XY\text{XY}XY.
State the sex chromosomes present in the body cells of their male lamb.
Given that a sheep's haploid gamete contains 27 chromosomes, state the total number of chromosomes found in a normal, healthy diploid body cell of this lamb.
43 exam-style questions on Edexcel IGCSE Biology Reproduction. Each one has a worked solution and a mark scheme showing where the marks go.