Variation and Inhertence 0.0 / 5 ? BiologyVariation and InheritanceGCSEOCR Created by: Simikatheryn.xCreated on: 05-06-16 20:47 What are the two types inherited characteristics? Dominant and recessive. 1 of 15 What are alleles? Alleles are different versions of the same gene. 2 of 15 What do the types inherited characteristics depend on? Dominant alleles are expressed when present, but recessive alleles are only expressed if the dominant allele is not present. 3 of 15 How many chromosomes do human body cells have? 23 pairs. 4 of 15 What do sex chromosomes determine? A mammal's sex. 5 of 15 Which sex chromosomes do females have and which sex chromosomes do males have? Females have identical sex chromosomes - ** chromosomes. Males have different sex chromosomes - XY chromosomes. 6 of 15 Which sex chromosome does an egg cell carry? X chromosome. 7 of 15 Which sex chromosome does a sperm cell carry? Either X or Y chromosome. 8 of 15 What is the chance of the offspring being male or female? Equal - 50/50 chance of offspring being male or female. 9 of 15 What causes genetic variation? mutations, rearrangement of genes during the formation of gametes, fertilisation. 10 of 15 What does a monohybrid cross involve? Only one pair of characteristics controlled by a single gene, one allele being dominant and one allele being recessive. 11 of 15 What is homozygous? Homozygous means that alleles are identical. 12 of 15 What is hetreozygous? Heterozygous means that alleles are different. 13 of 15 What causes inherited disorders? Faulty genes - mostly recessive faulty alleles. 14 of 15 How can the probability of inheriting genetic disorders be predicted? By interpreting genetic diagrams. 15 of 15
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