Cutubka 5: Genetics, su'aalo iyo jawaabo

Question 1

A pea plant with genotype RRYY is crossed with one with genotype rryy. What is the genotype of the offspring?

Accepted Answer

RrYy (one of each allele for both genes)

Answer

RRyy (a mix of both parents)

Answer

RRYY (the same as the first parent)

Answer

rryy (the same as the second parent)

Question 2

The probability of two independent events both occurring is:

Accepted Answer

the product of their individual probabilities

Answer

the difference of their individual probabilities

Answer

always equal to one half

Answer

the sum of their individual probabilities

Question 3

Which four types of gametes can an RrYy pea plant produce?

Accepted Answer

RY, Ry, rY, ry

Answer

Only two gametes, RY and ry

Answer

Four gametes each carrying two alleles of the same gene

Answer

Gametes with no allele for colour

Question 4

In a test cross, the unknown parent is heterozygous. What phenotypic ratio will the offspring show?

Accepted Answer

1:1

Answer

All dominant

Answer

1:2:1

Answer

3:1

Question 5

Which human trait is given as an example of codominant inheritance?

Accepted Answer

Blood group AB

Answer

Haemophilia

Answer

Height

Answer

Colour blindness

Question 6

Which sex determination system is common in birds, some insects like butterflies and some fish?

Accepted Answer

ZZ and ZW

Answer

XX and XY

Answer

AA and AB

Answer

XX and XO

Question 7

What happens to the frequency of recombination as two linked genes are farther apart?

Accepted Answer

It becomes greater

Answer

It becomes smaller

Answer

It stays the same

Answer

It becomes zero

Question 8

Which type of mutation repeats a segment of a chromosome?

Accepted Answer

Duplication

Answer

Inversion

Answer

Nondisjunction

Answer

Deletion

Cutubka 5: Genetics, su'aalo iyo jawaabo

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Genetics: su'aalo tusaale ah oo jawaabo leh