Which of the following statements is not true?Men have one X chromosome and one Y chromosomeWomen have two X chromosomesBoth men and women carry two alleles for the colour blindness geneThe Y chromosome is smaller than the X chromosome2Colour blindness is controlled by a sex-linked gene with two alleles on the X chromosome: a dominant normal (N) allele and a recessive colour blind (n) allele. What is the genotype of a female carrier of colour blindness?XnYXNXnXNXNXnXn3What is the genotype of a male with colour blindness?YNXnYnXNYXNYXn4There are four different phenotypes of blood types in humans, which are determined by three different alleles: A, B and O. Which of the following are genotypes of a person with blood group O?IOIO onlyIAIB or IOIOIAIO  or IOIOIBIO  or IOIO5What is meant by the term ‘codominance’?One allele of a gene is dominant over the otherA gene is only found on the X chromosomeTwo different alleles of a gene are expressed equallyA gene has only one allele

Color blindness is a sex-linked recessive trait. Which of the following statements must be true about color blindness?Group of answer choicesIf a mother is color-blind, then all her daughters will be color-blind.A color-blind boy’s father must also be color-blind.Females cannot be color-blind.A color-blind female must have a color-blind father.

In humans, if a non-disjunction event led to an individual with a genotype of XXY, they would _____.Group of answer choicesbe female because they have two X chromosomesnot survivedisplay both male and female characteristicsbe male because they have a Y chromosomeNext

X-linked recessive disorders can affect more human males than females because ______ always express the disorder when they inherit the recessive allele from ______.Multiple choice question.males; the fathermales; the motherfemales; the fatherfemales; the mother

Genes that are located on the X or Y chromosome are said to be ______ and often are expressed in one sex more than the other.

What chromosomes occur in pairs of the same size and contain the same genes in both genders?Multiple choice question.haploid chromosomesautosomesallelessex chromosomes