B3.13 Explain the terms: they think the offspring from the cup without looking those who cannot. dominant, recessive, pea plants will be if these and draw bar charts to show Choose students to homozygous, two plants are crossed the three numbers of the three taste either PTC strip or heterozygous, genotype, (bred). Record the class possible genotypes and genetic a control strip without phenotype and zygote votes for purple flowers, cross diagrams. telling students which is white flowers and lilac which. Ask each student B3.14 Explain monohybrid flowers. Come back to Equipment: 10 pale to taste his/her strip in inheritance using genetic this vote at the end of beads/buttons, 30 dark turn and say whether diagrams […] and family the lesson, and repeat beads/buttons, 4 plastic cups they can taste a bitter pedigrees the vote. Then ask (or other suitable containers), substance. Record the students to write down or marker pen, graph paper. findings on the board say if and why they have and then reveal which changed their minds. were the control strips. The finding that most (or all) of the subjects can detect PTC supports the idea that this phenotype is caused by a dominant allele. Digital: PTC and genetics presentation CB3d Inheritance B3.14 Explain monohybrid Tell students that Use models to investigate Invite someone who inheritance using […] humans have 23 pairs of inheritance by constructing a suffers from a genetic Punnett squares chromosomes and one of family pedigree for a family in disorder, or a these pairs is a pair of which cystic fibrosis occurs. spokesperson from a B3.15 Describe how the sex of sex chromosomes, of Students work in groups and charity that represents offspring is determined at which there are two discuss the clues in order to people with a certain fertilisation, using genetic types; X and Y. These construct the pedigree. They genetic disorder, to diagrams chromosomes are what
B3.13 B3.14 Explain the terms: dominant, recessive, homozygous, heterozygous, genotype, phenotype and zygote Explain monohybrid inheritance using genetic diagrams […] and family pedigrees they think the offspring pea plants will be if these two plants are crossed (bred). Record the class votes for purple flowers, white flowers and lilac flowers. Come back to this vote at the end of the lesson, and repeat the vote. Then ask students to write down or say if and why they have changed their minds. from the cup without looking and draw bar charts to show the three numbers of the three possible genotypes and genetic cross diagrams. Equipment: 10 pale beads/buttons, 30 dark beads/buttons, 4 plastic cups (or other suitable containers), marker pen, graph paper. those who cannot. Choose students to taste either PTC strip or a control strip without telling students which is which. Ask each student to taste his/her strip in turn and say whether they can taste a bitter substance. Record the findings on the board and then reveal which were the control strips. The finding that most (or all) of the subjects can detect PTC supports the idea that this phenotype is caused by a dominant allele. Digital: PTC and genetics presentation CB3d Inheritance B3.14 B3.15 Explain monohybrid inheritance using […] Punnett squares Describe how the sex of offspring is determined at fertilisation, using genetic diagrams Tell students that humans have 23 pairs of chromosomes and one of these pairs is a pair of sex chromosomes, of which there are two types; X and Y. These chromosomes are what Use models to investigate inheritance by constructing a family pedigree for a family in which cystic fibrosis occurs. Students work in groups and discuss the clues in order to construct the pedigree. They Invite someone who suffers from a genetic disorder, or a spokesperson from a charity that represents people with a certain genetic disorder, to