1. A/n _ is a family tree used to study inheritance of a trait in humans.
2 Huntington's disease is an example of a/n disorder, where anyone with one
copy of the allele that causes Huntington's will exhibit the disorder, and the allele is
not located on a sex chromosome.
3. Red-green color blindness is an example of a recessive disorder, passed on
the X chromosome,
4 Females can be carriers for recessive alleles located on the . but males
cannot

1. pedigree

2. autosomal dominant

3. sex-linked

4. x chromosome

5. profile of a person's chromosomes. Karyotypes reveal many important characteristics about a person's chromosomes, such as how many chromosomes they have, and the relative size, shape, and appearance of the chromosomes.

6. Females have the sex chromosomes XX, and males have the sex chromosomes XY. Each child obtains one sex chromosome from his or her biological mother and one sex chromosome from his or her biological father. Males receive a Y chromosome from their fathers and an X chromosome from their mothers. X-chromosome linked disorders, then, can be passed on to males from their mothers but never from their fathers.

7. a) autosomal dominant alleles lead the expression in the child. b) autosomal recessive alleles are only expressed if the other allele is homozygous. c) sex-linked dominant and d) sex-linked recessive are not applicable to sex-linkage only due to the fact that females can be hetero or homozygous.

Explanation:

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?