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Description
Flashcards by raffia.khalid99, updated more than 1 year ago
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Created by raffia.khalid99
almost 9 years ago
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| Question | Answer |
| How many chromosomes do human body cells contain? | 46 (23 from each parent) |
| How many chromosomes do human sex cells contain? | 23 (e.g. the egg cell contains 1 chromosome from each pair in the human body cell, as does the sperm cell) |
| What are alleles? | Each of two (or more) different versions of the same gene |
| What are homozygous genes? | Homozygous genes are genes with two or more of the same alleles |
| What are heterozygous genes? | Genes where the two or more alleles are different from eachother |
| How do the sexual reproduction genes from each parent produce variation in offspring? | Because each the egg only contains one chromosome from each pair of chromosome, as does the sperm cell. When they come together + produce offspring, they produce a random combination of chromosomes which produces variatoin. |
| Why do siblings differ from each other? | Because they have a different combination of paternal and maternal alleles |
| What traits will somebody show if they have...a.) one dominant allele and one recessive allele b.) two recessive alleles c.) two dominant alleles | a.) the dominant allele's characteristic b.) the recessive allele's characteristic c.) the dominant allele's characteristic |
| How do human males determine the sex of the offspring? | Human males have an X and a Y chromosome. If they pass on the Y chromosome, the offspring will develop testes, making the offspring male. |
| What's the difference between the genotype and the phenotype? | Genotype - describing the genetic make up of an organism (combination of alleles) Phenotype - the physical appearance of an organism (the observable characteristic) |
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