This can be for a variety of reasons, for example the sample size being too small or the ratios based on fertilisation (which is a random process). However, predicted phenotype ratios among offspring are not always achieved. This means the expected ratio of offspring plants that produce round seeds to plants that produce wrinkled seeds will be 3:1. The first is relevant when a single trait determined by one genetic locus is being observed. BBC Bitesize Scotland SQA National 5 Biology revision. Only one combination of the male and females alleles (rr) will give rise to plants that produce seeds with the recessive, wrinkled phenotype. VIDEO ANSWER: We were told that we have two P plants, one of which is homeless and the other of which is Hetero zegas for Pod shape. Two types of Punnett squares are commonly used. Find out why dominant and recessive alleles produce the characteristics that make individuals unique. Three quarters of the possible combinations of alleles (one RR and two Rr) will give rise to plants that produce seeds with the dominant round phenotype. When questions are correct they will turn green, and part of the picture will appear. The Punnet square shows the possible genotypes of the offspring. Look no further This digital self-checking activity has you coveredThis resource has 16 task card questions 1-8 are questions based on key vocabulary, 9-16 has students determine the probability of a given punnet square scenario. Each of their gametes only contains one allele of the gene for seed shape. The Punnett square below shows the expected genotypes of the offspring of parent pea plants that both have the genotype Rr. The possible genotypes and phenotypes of the offspring can be determined using a Punnett square, a grid that shows the possible combinations of alleles that can result at fertilisation.
0 Comments
Leave a Reply. |