BMST BMST - Basic Math and Science Genetics and Heredity Questions and Answers 4

Question 1

A plant with genotype TtYy is crossed with a plant that is ttYy. What fraction of offspring will be tall and yellow (T_Y_)?

Accepted Answer

3/8

Answer

Tt × tt gives 1/2 T_; Yy × Yy gives 3/4 Y_; multiplying gives 3/8 tall and yellow.

Question 2

Which term describes the physical appearance or observable traits of an organism?

Accepted Answer

Phenotype

Answer

Phenotype refers to the observable characteristics of an organism, while genotype refers to its genetic makeup.

Question 3

In humans, hemophilia A is an X-linked recessive disorder. A carrier mother and an unaffected father have children. What percentage of their sons will be affected?

Accepted Answer

50%

Answer

A carrier mother (X^H X^h) passes the X^h allele to half her sons, so 50% of sons will be affected.

Question 4

Two genes are said to be linked when they:

Accepted Answer

Are located on the same chromosome

Answer

Linked genes are located on the same chromosome and tend to be inherited together unless crossing over separates them.

Question 5

A mother is blood type A (I^A i) and a father is blood type B (I^B i). What blood types are possible in their children?

Accepted Answer

A, B, AB, and O

Answer

The cross I^A i × I^B i produces I^A I^B (AB), I^A i (A), I^B i (B), and ii (O) offspring.

BMST - Basic Math and Science Test Practice Test

BMST - Basic Math and Science Test Practice Test

BMST BMST - Basic Math and Science Genetics and Heredity Questions and Answers 4