Question

Study the given pedigree Chart and answer the question that follow:

• A. Is the trait recessive or Dominant?

• B. Is the Trait Sex-linked or autosomal?

• C. Give the genotypes of the parents shown in generation I and their third child shown in generation II and the first grandchild shown in generation III.

Answer 1

Looking at the pedigree table the trait displayed is a dominant one as all the generations are affected. The trait is autosomal due to both the sexes being equally affected. If 'A' is the dominant allele for the trait as well as ‘a' is the recessive allele then- the genotype of the generation 1 parent is -aa and Aa, the genotype of their third child shown in the generation is- Aa and the genotype of their first grandchild in -Aa.

Complete answer:
Option A- The trait shown in the chart is shown is Dominant. The dominant trait is an inherited characteristic that occurs in an offspring if it is provided from a parent through a dominant allele.
Option B – The Trait is Autosomal according to the chart. Autosomal is Pertaining to a chromosome that is not a sex chromosome . People normally have 22 pairs of autosomes (44 autosomes) in every cell, jointly with 2 sex chromosomes, X and Y in a male and X and X in a female.
Option C- A genotype is a person's collection of genes. The word also can refer to the two alleles inherited for a special gene. The genotype is conveyed when the information encoded in the genes' DNA is utilized to make protein as well as RNA molecules. Studying the chart let’s say ‘A' is the dominant gene. According to this
1.The genotype of the generation 1 parent is -aa and Aa
2.The genotype of their third child shown in the generation is- Aa
3.The genotype of their first grandchild in -Aa.

Note: A pedigree chart is a table or graph that reveals the occurrence along with the appearance of phenotypes of a particular gene or organism as well as its ancestors from one generation to the next. commonly these tables are for humans, show dogs, and race horses.