Meiosis, Gametes & Genetic Variation — Drills · Grade 7 Science
Chapter: Genes, Cell Division & HeredityWhat these drills covers
By the end of Meiosis, Gametes & Genetic Variation you should be able to:
- I can explain meiosis, gametes & genetic variation.
- I can use evidence, a model, and stated assumptions to support a biological explanation.
4 questions, multiple choice, numeric and written answer, each with a worked explanation.
Vocabulary used: meiosis, gamete, diploid, haploid, recombination.
Problem 1
Which set belongs to a normal gamete of the fictional six-chromosome diploid species?
- Six paired chromosomes
- Three, one from each pair
- Twelve
- No genetic material
Answer and explanation
Three, one from each pair
Reduction gives three chromosomes, one representative of each modeled pair.
Problem 2
A fictional diploid species has ten chromosomes. How many are in a normal gamete?
Answer and explanation
5 chromosomes
Ten arranged in five pairs yields one per pair: five.
Problem 3
Why is “any random half of the chromosomes” inadequate?
Answer and explanation
A functional gamete in this simplified normal model needs one representative of each type, not an arbitrary subset missing some types.
Problem 4
Does reshuffling necessarily create a new allele sequence?
Answer and explanation
No. It can combine existing versions differently. A mutation changes genetic material; these are distinct processes.