Biology Ch 14-16

Sex linked genes are located on

Both the x and y chromosome

Colorblindness is more common in males than in females because the allele for color blindness is

Recessive and located on the X chromosome

Which of the following statements is true?

A colorblind girls father must be colorblind

Human males have

One x and one Y chromosome

Which of the following forms a Barr body?

One of the X chromosomes in a female cell

The formation of a Barr body inactivates

One whole x chromosome in a female cell

A cat that has spots of more than one color

Is probably female

Which of the following pairs of genotypes result in the same phenotype?

IB IB and IB i

*If a man with blood type A and a woman with blood type B produce an offspring, what might be the offsprings blood type?

A, B, AB, or O

*the allele for the presence of a white forelock is dominant. What is the probability of the couple labeled 2 of having a child with a white forelock?

75%

*The allele for the presence of the white forelock trait is dominant. Therefore, we can tell from the chart that in the couple labelled 2

The make is heterozygous and the female is heterozygous

*In a pedigree, such as one in figure 14-4, a circle represents a

Female

*the trait in pedigree in figure 14-5 has two alleles: P (dominant) and p (recessive). The black symbols show the dominant phenotype, and the white symbols show the recessive phenotype. What is the genotype of individual #1?

Pp

*How many generations are shown in the pedigree in Figure 14-5?

4

If the allele for having a white forelock is dominant, family members WITHOUT a white forelock are

Homozygous recessive

*For the pedigree in Figure 14-6, shaded symbols represent afflicted people. Males are squares, women are circles. If the trait is a sex-linked trait carried on the x-chromosome, what is true about the mother represented by circle 1?

She has one allele for the disorder