B1- You and your genes (B1.2) 0.0 / 5 ? BiologyYou and your genesGCSEOCR Created by: MosopeCreated on: 25-04-16 19:24 What type of chromosomes do body cells contain ? pairs of chromosomes 1 of 19 How many chromosomes do sex cells contain ? one chromosome from each pair 2 of 19 Where do chromosomes in a pair carry their genes ? They carry the same genes in the same place 3 of 19 What are alleles and how many do individuals have ? different versions of the same gene and individuals usually have two alleles for each gene 4 of 19 What does Homozygous mean? you have two alleles the SAME for that particular gene 5 of 19 What does Heterozygous mean? you have two DIFFERENT alleles for that particular gene 6 of 19 What happens during sexual reproduction ? genes from both parents come together and produce variation in the offspring 7 of 19 Why do offspring have some similarities to their parents ? because of the combination of maternal and paternal alleles in the fertilised egg 8 of 19 Why do different offspring from the same parent differ from each other ? because they inherit different combinations of maternal and paternal alleles 9 of 19 Alleles can be..... ? Dominant or Recessive 10 of 19 Both dominant alleles will show..... ? dominant characteristics 11 of 19 Both recessive alleles will show..... ? recessive characteristics 12 of 19 One recessive and one dominant alleles will show....? dominant characteristics 13 of 19 What are the human male sex chromosomes ? XY 14 of 19 What are the human female sex chromosomes? ** 15 of 19 What does the sex-determine gene on the Y chromosome trigger ? the development of the testes 16 of 19 What happens in the absence of a Y chromosome? the ovaries develop 17 of 19 What does the term Genotype describe ? the genetic make-up of an organism (the combination of alleles) 18 of 19 What does the term Phenotype describe ? the observable characteristics that an organism has 19 of 19
Comments
No comments have yet been made