1) Which characteristic is dominant? a) Green b) Yellow c) Bendy d) Straight 2) Which is a heterozygous genotype? a) YY b) yy c) Yy 3) What is a Punnet Square? a) A type of square dance b) a grid for genetic crosses c) a graph d) a histogram 4) What is the probability of having a green banana if you cross Yy and Yy? a) 25% b) 50% c) 75% d) 100% 5) What colour will all the bananas be with this cross; YY with Yy? a) green b) yellow c) blue d) red 6) What id the probability of a person being affected with cystic fibrosis with this cross? a) 100% b) 75% c) 50% d) 25% 7) Which part of the cells does the cystic fibrosis gene affect? a) nucleus b) cytoplasm c) cell membrane d) mitochondria 8) What is polydactyly? a) recessively inherited genetic disorder b) dominantly inherited genetic disorder c) sex linked genetic disorder 9) What is the probability of being female? a) 100% b) 75% c) 50% d) 25% 10) What is the genotype of a female? a) XX b) XY c) YY d) XYY 11) What is the genotype of a male? a) XX b) XY c) YY d) XXY 12) What sex is this person? a) Male b) Female 13) What sex is this person? a) Male b) Female 14) What is wrong with this karyotype (set of chromsomes)? a) they are not straight b) they are too long c) there are too many chromosomes d) there are not enough chromosomes 15) How many chromosomes are in a gamete? a) 46 b) 92 c) 128 d) 23 16) How many chromosomes are in a body cell? a) 46 b) 92 c) 128 d) 23 17) Which chromosome number causes Down Syndrome a) Chromosome 12 b) Chromosome 20 c) Chromosome 1 d) Chromosome 21

Genetic Crosses Quiz

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