17.4. Monohybrid inheritance
A subsection of Biology, 0610, through 17. Inheritance
Listing 10 of 294 questions
For Examiner's Use 10 In Drosophila, the fruit fly, wing length is controlled by a single gene. Wing length can be long or short. A long winged male fruit fly was crossed with a short winged female. All of their offspring, the second generation, had long wings. When the second generation flies were interbred, to produce a third generation, some of the offspring had long wings and some had short wings. Which wing length is controlled by the recessive allele? Complete the genetic diagram, using the symbols R and r to represent the alleles. Parents male female (first generation) phenotypes ……… wings ………. wings genotypes …… … …… … gametes Offspring (second generation) genotypes …………… …………. ………………. ……………… phenotypes …………… …………. ………………. ……………… For Examiner's Use If the third generation consisted of 464 offspring how many would be expected to have short wings? Show your working. The female parent fruit fly was crossed with one of her male offspring from the second generation. Draw a genetic diagram to show this cross and state the ratio of the offspring phenotypes. genetic diagram ratio of offspring phenotypes
0610_w09_qp_2
THEORY
2009
Paper 2, Variant 0
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For Examiner's Use Four definitions of terms used in genetics are shown in Table 5.1. Table 5.1 definitions terms the outward appearance of an organism …………………… a length of DNA that codes for a protein …………………… having one set of chromosomes …………………… type of nuclear division which gives daughter nuclei that are genetically identical ……………………. For each of the definitions, select an appropriate term from the list and write it in the box provided. chromosome genotype mitosis diploid haploid mutation dominant heterozygous phenotype gene homozygous recessive A couple who have blood groups A and B have four children. Each child has a different blood group. Use the space below to draw a genetic diagram to show how this is possible. Use the symbols, IA , IB and Io, for the alleles. parental blood groups A × B parental genotypes × gamete genotypes children’s genotypes children’s blood groups For Examiner's Use Explain what is meant by codominance. You may refer to the genetic diagram in to help you with your answer. Insulin produced by genetically engineered bacteria first became available in 1982. Before 1982, insulin had been prepared from dead animal tissues. Explain the advantages of using insulin produced by genetically engineered bacteria rather than insulin from dead animal tissues. For Examiner's Use shows some of the steps involved in the genetic engineering of bacteria. human cell bacterium chromosomes in nucleus R S T genetically- engineered bacterium reproduction of bacteria production of insulin Name structure R and state what it is made from. State what is added at stages S and T.
0610_w09_qp_31
THEORY
2009
Paper 3, Variant 1
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For Examiner's Use Four definitions of terms used in genetics are shown in Table 5.1. Table 5.1 definitions terms the outward appearance of an organism …………………… a length of DNA that codes for a protein …………………… having one set of chromosomes …………………… type of nuclear division which gives daughter nuclei that are genetically identical ……………………. For each of the definitions, select an appropriate term from the list and write it in the box provided. chromosome genotype mitosis diploid haploid mutation dominant heterozygous phenotype gene homozygous recessive A couple who have blood groups A and B have four children. Each child has a different blood group. Use the space below to draw a genetic diagram to show how this is possible. Use the symbols, IA , IB and Io, for the alleles. parental blood groups A × B parental genotypes × gamete genotypes children’s genotypes children’s blood groups For Examiner's Use Explain what is meant by codominance. You may refer to the genetic diagram in to help you with your answer. Insulin produced by genetically engineered bacteria first became available in 1982. Before 1982, insulin had been prepared from dead animal tissues. Explain the advantages of using insulin produced by genetically engineered bacteria rather than insulin from dead animal tissues. For Examiner's Use shows some of the steps involved in the genetic engineering of bacteria. human cell bacterium chromosomes in nucleus R S T genetically- engineered bacterium reproduction of bacteria production of insulin Name structure R and state what it is made from. State what is added at stages S and T.
0610_w09_qp_32
THEORY
2009
Paper 3, Variant 2
View
Questions Discovered
294