Question

Answer very quick giving a hundred points

This pedigree chart tracks the inheritance of a recessive trait that is not sex-linked. Based on the information in the chart, which of the following statements is true?

This pedigree chart shows three generations. The individuals are numbered from left to right, starting at the top left of the chart. Squares represent males and circles represent females. If the symbol is gray, that individual exhibits the recessive trait. If the symbol is white, the individual exhibits the dominant trait. On the first row there are two couples mated together. The first couple is made up of individuals #1 (recessive) and #2 (dominant). They have four offspring on the second row that all exhibit dominant traits: #5 (dominant), #6 (dominant), #7 (dominant), and #8 (dominant). The second couple in Generation #1 is made up of individual #3 (dominant) and individual #4 (dominant). They have three offspring in Generation 2: #9 (dominant), #10 (recessive), and #11 (dominant). Individual #8 from the first family and individual #9 from the second family mated together and produced three offspring in Generation 3. These offspring are #12 (recessive), #13 (dominant), and #14 (recessive).

Individual #8 must be heterozygous for the trait.
Individual #10 must be heterozygous for the trait.
Individual #13 must be homozygous dominant.
Individual #3 must be homozygous dominant.

Answer 1

We need to see the graph. Ask Question again with graph attached.

Answer 2

Your answer is A. Individual #8 must be heterozygous for the trait.

Explanation:

So the way a Pedigree Diagram works is vertical lines extending downward from a couple represent their offspring. The oldest individuals are found at the top of a pedigree, with each subsequent generation occupying the next level below.

When analyzing the pattern of inheritance of a particular trait, it is common to shade in the symbol of all individuals that possess that trait.

•If a parent is homozygous, having two of the same type of alleles for a given trait, all of the offspring inherit that allele.

•If a parent is heterozygous, the offspring each have a 50/50 chance of inheriting either allele from that parent.

Dominance determines if a given trait is exhibited by an organism.

•In complete dominance, the presence of a dominant allele (in either genotype: XX or Xx) means the phenotype of the organism is the dominant trait.

•If only recessive alleles are present (xx), the phenotype of the organism is the recessive trait.