Examlex

Solved

In Chickens, Comb Shape Is Determined by Genes at Two

question 39

Multiple Choice

In chickens, comb shape is determined by genes at two loci (R, r and P, p) . A walnut comb is produced when at least one dominant gene R is present at one locus and at least one dominant gene P is present at a second locus (genotype R_ P_) . A rose comb is produced when at least one dominant gene is present at the first locus and two recessive genes are present at the second locus (genotype R_ pp) . A pea comb is produced when two recessive genes are present at the first locus and at least one dominant gene is present at the second (genotype rr P_) . If two recessive genes are present at the first and the second locus (rr pp) , a single comb is produced.
-Give genotypes for comb shape of the parents in the following cross: Rose crossed with walnut produces 6 walnut, 6 rose, 2 single, and 2 pea offspring.


Definitions:

Depression

A mental health disorder characterized by persistently low mood, loss of interest in activities, and a range of physical and cognitive symptoms.

Marital Satisfaction

Refers to the degree of contentment and positive feelings spouses have about their marriage.

Long-Term Marriages

Marital relationships that have lasted for a significant period, often characterized by deep emotional connections and evolved dynamics.

Menopause

Cessation of menstruation and of ability to bear children.

Related Questions